Tag LLVM

Write an LLVM Pass

In this post, I will show how I write an...

01 Mar 2017

Tag Hash Table

X Of A Kind In A Deck Of Cards Problem

LeetCode 914. In a deck of cards, each card has...

01 Oct 2022

Word Subsets Problem

LeetCode 916. You are given two string arrays words1 and...

01 Oct 2022

Vertical Order Traversal Of A Binary Tree Problem

LeetCode 987. Given the root of a binary tree, calculate...

01 Oct 2022

Unique Morse Code Words Problem

LeetCode 804. International Morse Code defines a standard encoding where...

01 Oct 2022

Unique Email Addresses Problem

LeetCode 929. Every valid email consists of a local name...

01 Oct 2022

Uncommon Words From Two Sentences Problem

LeetCode 884. A sentence is a string of single-space separated...

01 Oct 2022

Triples With Bitwise And Equal To Zero Problem

LeetCode 982. Given an integer array nums, return the number...

01 Oct 2022

Time Based Key-Value Store Problem

LeetCode 981. Design a time-based key-value data structure that can...

01 Oct 2022

Subdomain Visit Count Problem

LeetCode 811. A website domain “discuss.leetcode.com” consists of various subdomains....

01 Oct 2022

Subarrays With K Different Integers Problem

LeetCode 992. Given an integer array nums and an integer...

01 Oct 2022

Smallest Subtree With All The Deepest Nodes Problem

LeetCode 865. Given the root of a binary tree, the...

01 Oct 2022

Short Encoding Of Words Problem

LeetCode 820. A valid encoding of an array of words...

01 Oct 2022

Prison Cells After N Days Problem

LeetCode 957. There are 8 prison cells in a row...

01 Oct 2022

Powerful Integers Problem

LeetCode 970. Given three integers x, y, and bound, return...

01 Oct 2022

Online Election Problem

LeetCode 911. You are given two integer arrays persons and...

01 Oct 2022

Most Common Word Problem

LeetCode 819. Given a string paragraph and a string array...

01 Oct 2022

Minimum Area Rectangle Problem

LeetCode 939. You are given an array of points in...

01 Oct 2022

Maximum Frequency Stack Problem

LeetCode 895. Design a stack-like data structure to push elements...

01 Oct 2022

Linked List Components Problem

LeetCode 817. You are given the head of a linked...

01 Oct 2022

Length Of Longest Fibonacci Subsequence Problem

LeetCode 873. Given a strictly increasing array arr of positive...

01 Oct 2022

Hand Of Straights Problem

LeetCode 846. Alice has some number of cards and she...

01 Oct 2022

Groups Of Special-Equivalent Strings Problem

LeetCode 893. You are given an array of strings of...

01 Oct 2022

Fruit Into Baskets Problem

LeetCode 904. You are visiting a farm that has a...

01 Oct 2022

Find And Replace Pattern Problem

LeetCode 890. Given a list of strings words and a...

01 Oct 2022

Count Unique Characters Of All Substrings Of A Given String Problem

LeetCode 828. Let’s define a function countUniqueChars(s) that returns the...

01 Oct 2022

Construct Binary Tree From Preorder And Postorder Traversal Problem

LeetCode 889. Given two integer arrays, preorder and postorder where...

30 Sep 2022

Card Flipping Game Problem

LeetCode 822. You are given n cards, with a positive...

30 Sep 2022

Bus Routes Problem

LeetCode 815. You are given an array routes representing bus...

30 Sep 2022

Buddy Strings Problem

LeetCode 859. Given two strings s and goal, return true...

30 Sep 2022

Binary Trees With Factors Problem

LeetCode 823. Given an array of unique integers, arr, where...

30 Sep 2022

Binary Subarrays With Sum Problem

LeetCode 930. Given a binary array nums and an integer...

30 Sep 2022

Array Of Doubled Pairs Problem

LeetCode 954. Given an integer array of even length arr,...

30 Sep 2022

3Sum With Multiplicity Problem

LeetCode 923. Given an integer array arr, and an integer...

30 Sep 2022

Top K Frequent Words Problem

LeetCode 692. Given an array of strings words and an...

28 Sep 2022

Task Scheduler Problem

LeetCode 621. Given a characters array tasks, representing the tasks...

28 Sep 2022

Set Mismatch Problem

LeetCode 645. You have a set of integers s, which...

28 Sep 2022

Reorganize String Problem

LeetCode 767. Given a string s, rearrange the characters of...

28 Sep 2022

Random Pick With Blacklist Problem

LeetCode 710. You are given an integer n and an...

28 Sep 2022

Rabbits In Forest Problem

LeetCode 781. There is a forest with an unknown number...

28 Sep 2022

Partition Labels Problem

LeetCode 763. You are given a string s. We want...

28 Sep 2022

Parse Lisp Expression Problem

LeetCode 736. You are given a string expression representing a...

28 Sep 2022

Open The Lock Problem

LeetCode 752. You have a lock in front of you...

28 Sep 2022

Two Sum IV - Input Is A BST Problem

LeetCode 653. Given the root of a Binary Search Tree...

27 Sep 2022

Split Array Into Consecutive Subsequences Problem

LeetCode 659. You are given an integer array nums that...

27 Sep 2022

Smallest Range Covering Elements From K Lists Problem

LeetCode 632. You have k lists of sorted integers in...

27 Sep 2022

Shortest Completing Word Problem

LeetCode 748. Given a string licensePlate and an array of...

27 Sep 2022

Prefix And Suffix Search Problem

LeetCode 745. Design a special dictionary with some words that...

27 Sep 2022

Number Of Matching Subsequences Problem

LeetCode 792. Given a string s and an array of...

27 Sep 2022

Number Of Atoms Problem

LeetCode 726. Given a string formula representing a chemical formula,return...

27 Sep 2022

Find Duplicate File In System Problem

LeetCode 609. Given a list paths of directory info, including...

27 Sep 2022

Map Sum Pairs Problem

LeetCode 677. Design a map that allows you to do...

26 Sep 2022

Implement Magic Dictionary Problem

LeetCode 676. Design a data structure that is initialized with...

26 Sep 2022

Find Duplicate Subtrees Problem

LeetCode 652. Given the rootof a binary tree, return all...

26 Sep 2022

Employee Importance Problem

LeetCode 690. You have a data structure of employee information,...

26 Sep 2022

Design Hashset Problem

LeetCode 705. Design a HashSet without using any built-in hash...

26 Sep 2022

Design Hashmap Problem

LeetCode 706. Design a HashMap without using any built-in hash...

26 Sep 2022

Delete And Earn Problem

LeetCode 740. You are given an integer array nums. You...

26 Sep 2022

Degree Of An Array Problem

LeetCode 697. Given a non-empty array of non-negative integers nums,...

26 Sep 2022

Custom Sort String Problem

LeetCode 791. You are given two strings order and s....

26 Sep 2022

Basic Calculator IV Problem

LeetCode 770. Given an expression such as expression = “e...

26 Sep 2022

Sort Characters By Frequency Problem

LeetCode 451. Given a string s, sort it in decreasing...

24 Sep 2022

Sliding Window Median Problem

LeetCode 480. The median is the middle value in an...

24 Sep 2022

Reconstruct Original Digits From English Problem

LeetCode 423. Given a string s containing an out-of-order English...

24 Sep 2022

Random Flip Matrix Problem

LeetCode 519. There is an m x n binary grid...

24 Sep 2022

Permutation In String Problem

LeetCode 567. Given two strings s1 and s2, return true...

24 Sep 2022

Number Of Boomerangs Problem

LeetCode 447. You are given n points in the plane...

23 Sep 2022

Next Greater Element I Problem

LeetCode 496. The next greater element of some element x...

23 Sep 2022

Most Frequent Subtree Sum Problem

LeetCode 508. Given the root of a binary tree, return...

23 Sep 2022

Minimum Genetic Mutation Problem

LeetCode 433. A gene string can be represented by an...

23 Sep 2022

Minimum Index Sum Of Two Lists Problem

LeetCode 599. Suppose Andy and Doris want to choose a...

22 Sep 2022

Longest Uncommon Subsequence II Problem

LeetCode 522. Given an array of strings strs, return the...

22 Sep 2022

Longest Repeating Character Replacement Problem

LeetCode 424. You are given a string s and an...

22 Sep 2022

Longest Palindrome Problem

LeetCode 409. Given a string s which consists of lowercase...

22 Sep 2022

Longest Harmonious Subsequence Problem

LeetCode 594. We define a harmonious array as an array...

22 Sep 2022

LFU Cache Problem

LeetCode 460. Design and implement a data structure for a...

22 Sep 2022

Keyboard Row Problem

LeetCode 500. Given an array of strings words, return the...

22 Sep 2022

K-Diff Pairs In An Array Problem

LeetCode 532. Given an array of integers nums and an...

22 Sep 2022

Increasing Subsequences Problem

LeetCode 491. Given an integer array nums, return all the...

22 Sep 2022

Find Right Interval Problem

LeetCode 436. You are given an array of intervals, where...

21 Sep 2022

Find All Numbers Disappeared In An Array Problem

LeetCode 448. Given an array nums of n integers where...

21 Sep 2022

Find All Duplicates In An Array Problem

LeetCode 442. Given an integer array nums of length n...

21 Sep 2022

Find All Anagrams In A String Problem

LeetCode 438. Given two strings s and p, return an...

21 Sep 2022

Encode And Decode TinyURL Problem

LeetCode 535. TinyURL is a URL shortening service where you...

21 Sep 2022

Distribute Candies Problem

LeetCode 575. Alice has n candies, where the i^th candy...

21 Sep 2022

Contiguous Array Problem

LeetCode 525. Given a binary array nums, return the maximum...

21 Sep 2022

Circular Array Loop Problem

LeetCode 457. You are playing a game involving a circular...

19 Sep 2022

Brick Wall Problem

LeetCode 554. There is a rectangular brick wall in front...

19 Sep 2022

All O'One Data Structure Problem

LeetCode 432. Design a data structure to store the strings...

19 Sep 2022

Valid Anagram Problem

LeetCode 242. Given two strings s and t, return true...

18 Sep 2022

Ugly Number II Problem

LeetCode 264. An ugly number is a positive integer whose...

18 Sep 2022

Top K Frequent Elements Problem

LeetCode 347. Given an integer array nums and an integer...

18 Sep 2022

Word Pattern Problem

LeetCode 290. Given a pattern and a string s, find...

16 Sep 2022

Ransom Note Problem

LeetCode 383. Given two stings ransomNote and magazine, return true...

16 Sep 2022

Random Pick Index Problem

LeetCode 398. Given an integer array nums with possible duplicates,...

16 Sep 2022

Palindrome Pairs Problem

LeetCode 336. Given a list of unique words, return all...

16 Sep 2022

Missing Number Problem

LeetCode 268. Given an array nums containing n distinct numbers...

15 Sep 2022

Majority Element II Problem

LeetCode 229. Given an integer array of size n, find...

10 Apr 2022

Longest Substring With At Least K Repeating Characters Problem

LeetCode 395. Given a string s and an integer k,...

10 Apr 2022

Isomorphic Strings Problem

LeetCode 205. Given two strings s and t, determine if...

10 Apr 2022

Intersection Of Two Arrays II Problem

LeetCode 350. Given two integer arrays nums1 and nums2, return...

10 Apr 2022

Insert Delete Getrandom O(1) - Duplicates Allowed Problem

LeetCode 381. RandomizedCollection is a data structure that contains a...

10 Apr 2022

Happy Number Problem

LeetCode 202. Write an algorithm to determine if a number...

10 Apr 2022

First Unique Character In A String Problem

LeetCode 387. Given a string s, find the first non-repeating...

10 Apr 2022

Find The Difference Problem

LeetCode 389. You are given two strings s and t....

10 Apr 2022

Design Twitter Problem

LeetCode 355. Design a simplified version of Twitter where users...

10 Apr 2022

Contains Duplicate Problem

LeetCode 217. Given an integer array nums, return true if...

10 Apr 2022

Contains Duplicate II Problem

LeetCode 219. Given an integer array nums and an integer...

10 Apr 2022

Bulls And Cows Problem

LeetCode 299. You are playing the Bulls and Cows game...

10 Apr 2022

Repeated DNA Sequences Problem

LeetCode 187. The DNA sequence is composed of a series...

04 Dec 2021

Majority Element Problem

LeetCode 169. Given an array nums of size n, return...

04 Dec 2021

Intersection Of Two Linked Lists Problem

LeetCode 160. Given the heads of two singly linked-lists headA...

04 Dec 2021

Fraction To Recurring Decimal Problem

LeetCode 166. Given two integers representing the numerator and denominator...

04 Dec 2021

Word Break Problem

LeetCode 139. Given a string s and a dictionary of...

03 Dec 2021

Word Break II Problem

LeetCode 140. Given a string s and a dictionary of...

03 Dec 2021

Max Points On A Line Problem

LeetCode 149. Given an array of points where points[i] =...

03 Dec 2021

Lru Cache Problem

LeetCode 146. Design a data structure that follows the constraints...

03 Dec 2021

Linked List Cycle Problem

LeetCode 141. Given head, the head of a linked list,...

03 Dec 2021

Linked List Cycle II Problem

LeetCode 142. Given the head of a linked list, return...

03 Dec 2021

Copy List With Random Pointer Problem

LeetCode 138. A linked list of length n is given...

03 Dec 2021

Clone Graph Problem

LeetCode 133. Given a reference of a node in a...

03 Dec 2021

Word Ladder Problem

LeetCode 127. Given two words, beginWord and endWord, and a...

29 Nov 2021

Word Ladder II Problem

LeetCode 126. Given two words, beginWord and endWord, and a...

29 Nov 2021

Longest Consecutive Sequence Problem

LeetCode 128. Given an unsorted array of integers nums, return...

29 Nov 2021

Construct Binary Tree from Preorder and Inorder Traversal Problem

LeetCode 105. Given two integer arrays preorder and inorder where...

20 Nov 2021

Set Matrix Zeroes Problem

LeetCode 73. Given an m x n integer matrix matrix,...

10 Nov 2021

Search in Rotated Sorted Array Problem

LeetCode 36. Determine if a 9 x 9 Sudoku board...

06 Nov 2021

Substring with Concatenation of All Words Problem

LeetCode 30. You are given a string s and an...

06 Nov 2021

Integer to Roman Problem

LeetCode 12. Given an integer, convert it to a roman...

06 Nov 2021

Group Anagrams Problem

LeetCode 49. Given an array of strings strs, group the...

06 Nov 2021

First Missing Positive Problem

LeetCode 41. Given an unsorted integer array nums, return the...

06 Nov 2021

Roman to Integer Problem

LeetCode 13. Given a roman numeral, convert it to an...

05 Nov 2021

Letter Combinations of a Phone Number Problem

LeetCode 17. Given a string containing digits from 2-9 inclusive,...

05 Nov 2021

Longest Substring Without Repeating Characters Problem

LeetCode 3. Given a string s, find the length of...

05 Mar 2021

Sum Of Unique Elements Problem

LeetCode 1748. You are given an integer array nums. The...

15 Feb 2021

Insert Delete GetRandom O(1) Problem

LeetCode 380. Implement a RandomizedSet class.

03 Feb 2021

N-Repeated Element In Size 2N Array Problem

LeetCode 961. In a array A of size 2N, there...

31 Jan 2021

Intersection Of Two Arrays Problem

LeetCode 349. Given two arrays, write a function to compute...

31 Jan 2021

Intersection Of Three Sorted Arrays Problem

LeetCode 1213. Given three integer arrays arr1, arr2 and arr3...

31 Jan 2021

Jewels And Stones Problem

LeetCode 771. You’re given strings jewels representing the types of...

27 Jan 2021

Number Of Good Pairs Problem

LeetCode 1512. Given an array of integers nums. Return the...

26 Jan 2021

Kth Missing Positive Number Problem

LeetCode 1539. Given an array arr of positive integers sorted...

25 Jan 2021

Maximum Equal Frequency Problem

LeetCode 1224. Given an array nums of positive integers, return...

08 Dec 2020

Subarray Sum Divisible By K Problem

LeetCode 974. Given an array of integers nums and an...

12 Nov 2020

Four Sum II Problem

LeetCode 454. Given four lists A, B, C, D of...

12 Nov 2020

Continuous Subarray Sum Problem

LeetCode 523. Given an array of non-negative integers nums and...

12 Nov 2020

Subarray Sum Equals K Problem

LeetCode 560. Given an array of integers nums and an...

11 Nov 2020

Two Sum Problem

LeetCode 1. Given an array of integers nums and an...

09 Nov 2020

Tag Leetcode

Symmetric Tree Problem

LeetCode 101. Given the root of a binary tree, check...

20 Nov 2021

Maximum Depth of Binary Tree Problem

LeetCode 104. Given the root of a binary tree, return...

20 Nov 2021

Construct Binary Tree from Preorder and Inorder Traversal Problem

LeetCode 105. Given two integer arrays preorder and inorder where...

20 Nov 2021

Construct Binary Tree From Inorder And Postorder Traversal Problem

LeetCode 106. Given two integer arrays inorder and postorder where...

20 Nov 2021

Binary Tree Zigzag Level Order Traversal Problem

LeetCode 103. Given the root of a binary tree, return...

20 Nov 2021

Binary Tree Level Order Traversal Problem

LeetCode 102. Given the root of a binary tree, return...

20 Nov 2021

Binary Tree Level Order Traversal II Problem

LeetCode 107. Given the root of a binary tree, return...

20 Nov 2021

Validate Binary Search Tree Problem

LeetCode 98. Given the root of a binary tree, determine...

16 Nov 2021

Same Tree Problem

LeetCode 100. Given the roots of two binary trees p...

16 Nov 2021

Recover Binary Search Tree Problem

LeetCode 99. You are given the root of a binary...

16 Nov 2021

Interleaving String Problem

LeetCode 97. Given strings s1, s2, and s3, find whether...

16 Nov 2021

Word Search Problem

LeetCode 79. Given an m x n grid of characters...

14 Nov 2021

Unique Binary Search Trees Problem

LeetCode 96. Given an integer n, return the number of...

14 Nov 2021

Unique Binary Search Trees II Problem

LeetCode 95. Given an integer n, return all the structurally...

14 Nov 2021

Subsets Problem

LeetCode 78. Given an integer array nums of unique elements,...

14 Nov 2021

Subsets II Problem

LeetCode 90. Given an integer array nums that may contain...

14 Nov 2021

Search in Rotated Sorted Array II Problem

LeetCode 81. There is an integer array nums sorted in...

14 Nov 2021

Scramble String Problem

LeetCode 87. Given two strings s1 and s2 of the...

14 Nov 2021

Restore IP Addresses Problem

LeetCode 93. Given a string s containing only digits, return...

14 Nov 2021

Remove Duplicates from Sorted List Problem

LeetCode 83. Given the head of a sorted linked list,...

14 Nov 2021

Remove Duplicates from Sorted List II Problem

LeetCode 82. Given the head of a sorted linked list,...

14 Nov 2021

Remove Duplicates from Sorted Array II Problem

LeetCode 80. Given an integer array nums sorted in non-decreasing...

14 Nov 2021

Partition List Problem

LeetCode 86. Given the head of a linked list and...

14 Nov 2021

Merge Sorted Array Problem

LeetCode 88. You are given two integer arrays nums1 and...

14 Nov 2021

Maximal Rectangle Problem

LeetCode 85. Given a rows x cols binary matrix filled...

14 Nov 2021

Largest Rectangle in Histogram Problem

LeetCode 84. Given an array of integers heights representing the...

14 Nov 2021

Gray Code Problem

LeetCode 89. Given an integer n, return any valid n-bit...

14 Nov 2021

Decode Ways Problem

LeetCode 91. Given a string s containing only digits, return...

14 Nov 2021

Binary Tree Inorder Traversal Problem

LeetCode 94. Given an m x n grid of characters...

14 Nov 2021

Sort Colors Problem

LeetCode 75. Given an array nums with n objects colored...

10 Nov 2021

Simplify Path Problem

LeetCode 71. Given a string path, which is an absolute...

10 Nov 2021

Set Matrix Zeroes Problem

LeetCode 73. Given an m x n integer matrix matrix,...

10 Nov 2021

Search A 2D Matrix Problem

LeetCode 74. Write an efficient algorithm that searches for a...

10 Nov 2021

Minimum Window Substring Problem

LeetCode 76. Given two strings s and t of lengths...

10 Nov 2021

Edit Distance Problem

LeetCode 72. Given two strings word1 and word2, return the...

10 Nov 2021

Combinations Problem

LeetCode 77. Given two integers n and k, return all...

10 Nov 2021

Valid Number Problem

LeetCode 65. Given a string s, return true if s...

09 Nov 2021

Unique Paths Problem

LeetCode 62. A robot is located at the top-left corner...

09 Nov 2021

Unique Paths II Problem

LeetCode 63. A robot is located at the top-left corner...

09 Nov 2021

Text Justification Problem

LeetCode 68. Given an array of strings words and a...

09 Nov 2021

Rotate List Problem

LeetCode 61. Given the head of a linked list, rotate...

09 Nov 2021

Plus One Problem

LeetCode 66. You are given a large integer represented as...

09 Nov 2021

Minimum Path Sum Problem

LeetCode 64. Given a m x n grid filled with...

09 Nov 2021

Climbing Stairs Problem

LeetCode 70. You are climbing a staircase. It takes n...

09 Nov 2021

Valid Number Problem

LeetCode 67. A robot is located at the top-left corner...

09 Nov 2021

Spiral Matrix Problem

LeetCode 54. Given an m x n matrix, return all...

08 Nov 2021

Spiral Matrix II Problem

LeetCode 59. Given a positive integer n, generate an n...

08 Nov 2021

Permutation Sequence Problem

LeetCode 60. Given n and k, return the kth permutation...

08 Nov 2021

N-Queens Problem

LeetCode 51. Given an integer n, return all distinct solutions...

08 Nov 2021

N-Queens II Problem

LeetCode 52. Given an integer n, return the number of...

08 Nov 2021

Maximum Subarray Problem

LeetCode 53. Given an integer array nums, find the contiguous...

08 Nov 2021

Length Of Last Word Problem

LeetCode 58. Given a string s consisting of some words...

08 Nov 2021

Jump Game Problem

LeetCode 55. Given an m x n matrix, return all...

08 Nov 2021

Insert Interval Problem

LeetCode 57. Insert newInterval into intervals such that intervals is...

08 Nov 2021

Zigzag Conversion Problem

LeetCode 6. Write the code that will take a string...

06 Nov 2021

Wildcard Matching Problem

LeetCode 44. Write the code that will take a string...

06 Nov 2021

Search in Rotated Sorted Array Problem

LeetCode 36. Determine if a 9 x 9 Sudoku board...

06 Nov 2021

Trapping Rain Water Problem

LeetCode 42. Given n non-negative integers representing an elevation map...

06 Nov 2021

Sudoku Solver Problem

LeetCode 37. Write a program to solve a Sudoku puzzle...

06 Nov 2021

Substring with Concatenation of All Words Problem

LeetCode 30. You are given a string s and an...

06 Nov 2021

Search in Rotated Sorted Array Problem

LeetCode 33. Given the array nums after the possible rotation...

06 Nov 2021

Rotate Image Problem

LeetCode 48. Determine if a 9 x 9 Sudoku board...

06 Nov 2021

Reverse Nodes in k-Group Problem

LeetCode 25. Given a linked list, reverse the nodes of...

06 Nov 2021

Remove Element Problem

LeetCode 27. Given an integer array nums and an integer...

06 Nov 2021

Regular Expression Matching Problem

LeetCode 10. Given an input string s and a pattern...

06 Nov 2021

Pow(x,n) Problem

LeetCode 50. Determine if a 9 x 9 Sudoku board...

06 Nov 2021

Permutations Problem

LeetCode 46. Given an array nums of distinct integers, return...

06 Nov 2021

Permutations II Problem

LeetCode 47. Given a collection of numbers, nums, that might...

06 Nov 2021

Palindrome Number Problem

LeetCode 9. Given an integer x, return true if x...

06 Nov 2021

Next Permutation Problem

LeetCode 31. Implement next permutation, which rearranges numbers into the...

06 Nov 2021

Multiply Strings Problem

LeetCode 43. Given two non-negative integers num1 and num2 represented...

06 Nov 2021

Jump Game II Problem

LeetCode 45. Given an array of non-negative integers nums, you...

06 Nov 2021

Integer to Roman Problem

LeetCode 12. Given an integer, convert it to a roman...

06 Nov 2021

Implement strStr() Problem

LeetCode 28. Implement strStr().

06 Nov 2021

Group Anagrams Problem

LeetCode 49. Given an array of strings strs, group the...

06 Nov 2021

First Missing Positive Problem

LeetCode 41. Given an unsorted integer array nums, return the...

06 Nov 2021

Find First and Last Position of Element in Sorted Array Problem

LeetCode 34. Given the array nums after the possible rotation...

06 Nov 2021

Divide Two Integers Problem

LeetCode 29. Write the code that will take a string...

06 Nov 2021

Count and Say Problem

LeetCode 38. Write the code that will take a string...

06 Nov 2021

Combination Sum Problem

LeetCode 39. Given an array of distinct integers candidates and...

06 Nov 2021

Combination Sum II Problem

LeetCode 40. Given a collection of candidate numbers (candidates) and...

06 Nov 2021

3Sum Closest Problem

LeetCode 16. Given an integer array nums of length n...

06 Nov 2021

Valid Parentheses Problem

LeetCode 20. Given a string s containing just the characters...

05 Nov 2021

Swap Nodes in Pairs Problem

LeetCode 24. Given a linked list, swap every two adjacent...

05 Nov 2021

Roman to Integer Problem

LeetCode 13. Given a roman numeral, convert it to an...

05 Nov 2021

Reverse Integer Problem

LeetCode 7. Given a signed 32-bit integer x, return x...

05 Nov 2021

Remove Nth Node From End of List Problem

LeetCode 19. Given the head of a linked list, remove...

05 Nov 2021

Remove Duplicates from Sorted Array Problem

LeetCode 26. Given an integer array nums sorted in non-decreasing...

05 Nov 2021

Longest Palindromic Substring Problem

LeetCode 5. Given a string s, return the longest palindromic...

05 Nov 2021

Longest Common Prefix Problem

LeetCode 14. Write a function to find the longest common...

05 Nov 2021

Letter Combinations of a Phone Number Problem

LeetCode 17. Given a string containing digits from 2-9 inclusive,...

05 Nov 2021

Generate Parentheses Problem

LeetCode 22. Given n pairs of parentheses, write a function...

05 Nov 2021

Depth of BST Given Insertion Order Problem

LeetCode 1902. You are given a 0-indexed integer array order...

05 Nov 2021

Container With Most Water Problem

LeetCode 11. Given n non-negative integers a_1, a_2, …, a_n...

05 Nov 2021

Smallest Greater Multiple Made of Two Digits Problem

LeetCode 1999. Given three integers, k, digit1, and digit2, you...

12 Sep 2021

Reverse Prefix of Word Problem

LeetCode 2000. Given a 0-indexed string word and a character...

12 Sep 2021

Users That Actively Request Confirmation Messages Problem

LeetCode 1939. Write an SQL query to find the IDs...

11 Sep 2021

Strong Friendship Problem

LeetCode 1949. Write an SQL query to find all the...

11 Sep 2021

Leetcodify Similar Friends Problem

LeetCode 1919. Write an SQL query to report the similar...

11 Sep 2021

Leetcodify Friends Recommendations Problem

LeetCode 1917. Write an SQL query to recommend friends to...

11 Sep 2021

First and Last Call On the Same Day Problem

LeetCode 1972. Write an SQL query to report the IDs...

11 Sep 2021

Find Cutoff Score for Each School Problem

LeetCode 1988. Write an SQL query to report the minimum...

11 Sep 2021

Employees With Missing Information Problem

LeetCode 1965. Write an SQL query to report the IDs...

11 Sep 2021

Employees Whose Manager Left the Company Problem

LeetCode 1978. Write an SQL query to report the IDs...

11 Sep 2021

Count the Number of Experiments Problem

LeetCode 1990. Write an SQL query to report the number...

11 Sep 2021

Count Salary Categories Problem

LeetCode 1907. Write an SQL query to report the number...

11 Sep 2021

Confirmation Rate Problem

LeetCode 1934. Write an SQL query to find the confirmation...

11 Sep 2021

All the Pairs With the Maximum Number of Common Followers Problem

LeetCode 1951. Write an SQL query to find all the...

11 Sep 2021

The Latest Login in 2020 Problem

LeetCode 1890. Write an SQL query to report the latest...

13 Jun 2021

Suspicious Bank Accounts Problem

LeetCode 1843. Write an SQL query to report the IDs...

13 Jun 2021

Page Recommendations II Problem

LeetCode 1892. Write an SQL query to find all the...

13 Jun 2021

Orders With Maximum Quantity Above Average Problem

LeetCode 1867. Write an SQL query to find the order_id...

13 Jun 2021

Maximum Transaction Each Day Problem

LeetCode 1831. Write an SQL query to report the IDs...

13 Jun 2021

League Statistics Problem

LeetCode 1841. Write an SQL query to report the statistics...

13 Jun 2021

Group Employees of the Same Salary Problem

LeetCode 1875. Write an SQL query to report the IDs...

13 Jun 2021

Find Customers With Positive Revenue this Year Problem

LeetCode 1821. Write an SQL query to report the customers...

13 Jun 2021

Convert Date Format Problem

LeetCode 1853. Write an SQL query to convert each date...

13 Jun 2021

Calculate Special Bonus Problem

LeetCode 1873. Write an SQL query to calculate the bonus...

13 Jun 2021

Rearrange Products Table Problem

LeetCode 1795. Write an SQL query to rearrange the Products...

03 Apr 2021

Find Interview Candidates Problem

LeetCode 1811. Write an SQL query to report the name...

03 Apr 2021

Determine Color Of A Chessboard Square Problem

LeetCode 1812. You are given coordinates, a string that represents...

03 Apr 2021

Ad-Free Sessions Problem

LeetCode 1809. Write an SQL query to report all the...

03 Apr 2021

String To Interger (atoi) Problem

LeetCode 8. Implement the myAtoi(string s) function, which converts a...

17 Mar 2021

Primary Department For Each Employee Problem

LeetCode 1789. Write an SQL query to report all the...

17 Mar 2021

Grand Slam Titles Problem

LeetCode 1783. Write an SQL query to report the number...

08 Mar 2021

Product's Price For Each Store Problem

LeetCode 1777. Write an SQL query to find the price...

05 Mar 2021

Longest Substring Without Repeating Characters Problem

LeetCode 3. Given a string s, find the length of...

05 Mar 2021

Find The Subtasks That Did Not Execute Problem

LeetCode 1767. Write an SQL query to report the IDs...

05 Mar 2021

Add Two Numbers Problem

LeetCode 2. You are given two non-empty linked lists representing...

05 Mar 2021

Sum Of Unique Elements Problem

LeetCode 1748. You are given an integer array nums. The...

15 Feb 2021

Recyclable And Low Fat Products Problem

LeetCode 1757. Write an SQL query to find the ids...

14 Feb 2021

Leetflex Banned Accounts Problem

LeetCode 1747. Write an SQL query to find the account_id...

10 Feb 2021

Insert Delete GetRandom O(1) Problem

LeetCode 380. Implement a RandomizedSet class.

03 Feb 2021

N-Repeated Element In Size 2N Array Problem

LeetCode 961. In a array A of size 2N, there...

31 Jan 2021

Intersection Of Two Arrays Problem

LeetCode 349. Given two arrays, write a function to compute...

31 Jan 2021

Intersection Of Three Sorted Arrays Problem

LeetCode 1213. Given three integer arrays arr1, arr2 and arr3...

31 Jan 2021

Find Total Time Spent By Each Employee Problem

LeetCode 1741. Write an SQL query to calculate the total...

31 Jan 2021

Jewels And Stones Problem

LeetCode 771. You’re given strings jewels representing the types of...

27 Jan 2021

Number Of Good Pairs Problem

LeetCode 1512. Given an array of integers nums. Return the...

26 Jan 2021

Kth Missing Positive Number Problem

LeetCode 1539. Given an array arr of positive integers sorted...

25 Jan 2021

The Number Of Employees Which Report To Each Employee Problem

LeetCode 1731. Write an SQL query to report the ids...

24 Jan 2021

Find Followers Count Problem

LeetCode 1729. Write an SQL query that will, for each...

20 Jan 2021

Count Apples And Oranges Problem

LeetCode 1715. Write an SQL query to count the number...

09 Jan 2021

Biggest Window Between Visits Problem

LeetCode 1709. Write an SQL query that will, for each...

04 Jan 2021

Total Sales Amount By Year Problem

LeetCode 1384. Write an SQL query to report the Total...

29 Dec 2020

Sales By Day Of The Week Problem

LeetCode 1479. Write an SQL query to report how many...

29 Dec 2020

Hopper Company Queries III Problem

LeetCode 1651. Write an SQL query to compute the average_ride_distance...

29 Dec 2020

Get The Second Most Recent Activity Problem

LeetCode 1369. Write an SQL query to show the second...

29 Dec 2020

Find The Quiet Students In All Exams Problem

LeetCode 1412. Write an SQL query to report the students...

29 Dec 2020

Tournament Winners Problem

LeetCode 1194. Write an SQL query to find the winner...

28 Dec 2020

Students Report By Geography Problem

LeetCode 618. A U.S graduate school has students from Asia,...

28 Dec 2020

Report Contiguous Dates Problem

LeetCode 1225. Write an SQL query to generate a report...

28 Dec 2020

Median Employee Salary Problem

LeetCode 569. Write a SQL query to find the median...

28 Dec 2020

Market Analysis II Problem

LeetCode 1159. Write an SQL query to find for each...

28 Dec 2020

Hopper Company Queries I Problem

LeetCode 1635. Write an SQL query to report the following...

28 Dec 2020

Game Play Analysis V Problem

LeetCode 1097. Write an SQL query that reports for each...

28 Dec 2020

User Purchase Platform Problem

LeetCode 1127. Write an SQL query to find the total...

27 Dec 2020

Trips And Users Problem

LeetCode 262. Write a SQL query to find the cancellation...

27 Dec 2020

Number Of Transactions Per Visit Problem

LeetCode 1336. Write an SQL query to find how many...

27 Dec 2020

Human Traffic Of Stadium Problem

LeetCode 601. Write an SQL query to display the records...

27 Dec 2020

Hopper Company Queries II Problem

LeetCode 1645. Write an SQL query to report the percentage...

27 Dec 2020

Find Median Given Frequency Of Numbers Problem

LeetCode 571. Write a query to find the median of...

27 Dec 2020

Find Cumulative Salary Of An Employee Problem

LeetCode 579. Write a SQL to get the cumulative sum...

27 Dec 2020

Department Top Three Salaries Problem

LeetCode 185. Write a SQL query to find employees who...

27 Dec 2020

Average Salary: Departments VS Company Problem

LeetCode 615. Given two tables as below, write a query...

27 Dec 2020

Unpopular Books Problem

LeetCode 1098. Write an SQL query that reports the books...

26 Dec 2020

Second Degree Follower Problem

LeetCode 614. Please write a sql query to get the...

26 Dec 2020

Reported Posts II Problem

LeetCode 1132. Write an SQL query to find the average...

26 Dec 2020

Number Of Calls Between Two Persons Problem

LeetCode 1699. Write an SQL query to report the number...

26 Dec 2020

Nth Highest Salary Problem

LeetCode 177. Write a SQL query to get the nth...

26 Dec 2020

New Users Daily Count Problem

LeetCode 1107. Write an SQL query that reports for every...

26 Dec 2020

Monthly Transactions II Problem

LeetCode 1205. Write an SQL query to find for each...

26 Dec 2020

Get Highest Answer Rate Question Problem

LeetCode 578. Write a sql query to identify the question...

26 Dec 2020

Department Highest Salary Problem

LeetCode 184. Write a SQL query to find employees who...

26 Dec 2020

Article Views II Problem

LeetCode 1149. Write an SQL query to find all the...

26 Dec 2020

Active Users Problem

LeetCode 1454. Write an SQL query to find the id...

26 Dec 2020

Winning Candidate Problem

LeetCode 574. Write a sql to find the name of...

25 Dec 2020

Team Scores In Football Tournament Problem

LeetCode 1212. Write an SQL query that selects the team_id,...

25 Dec 2020

Rank Scores Problem

LeetCode 178. Write a SQL query to rank scores. If...

25 Dec 2020

Product Sales Analysis III Problem

LeetCode 1070. Write an SQL query that selects the product...

25 Dec 2020

Movie Rating Problem

LeetCode 1341. Write the following SQL query to find the...

25 Dec 2020

Investments In 2016 Problem

LeetCode 585. Write a query to print the sum of...

25 Dec 2020

Immediate Food Delivery II Problem

LeetCode 1174. Write an SQL query to find the percentage...

25 Dec 2020

Friend Requests II: Who Has The Most Friends Problem

LeetCode 602. In social network like Facebook or Twitter, people...

25 Dec 2020

Countries You Can Safely Invest In Problem

LeetCode 1501. Write an SQL query to find the countries...

25 Dec 2020

Count Student Number In Departments Problem

LeetCode 580. A university uses 2 data tables, student and...

25 Dec 2020

Bank Account Summary Problem

LeetCode 1555. Our bank records all transactions in the table...

25 Dec 2020

Tree Node Problem

LeetCode 608. Given a table tree, id is identifier of...

23 Dec 2020

The Most Recent Orders For Each Product Problem

LeetCode 1549. Write an SQL query to find the most...

23 Dec 2020

Shortest Distance In A Plane Problem

LeetCode 612. Write a query to find the shortest distance...

23 Dec 2020

Rectangles Area Problem

LeetCode 1459. Write an SQL query to report of all...

23 Dec 2020

Product Price At A Given Date Problem

LeetCode 1164. Write an SQL query to find the prices...

23 Dec 2020

Page Recommendations Problem

LeetCode 1264. Write an SQL query to recommend pages to...

23 Dec 2020

Monthly Transactions I Problem

LeetCode 1193. Write an SQL query to find for each...

23 Dec 2020

Market Analysis I Problem

LeetCode 1158. Write an SQL query to find for each...

23 Dec 2020

Managers With At Least 5 Direct Reports Problem

LeetCode 570. Given the Employee table, write a SQL query...

23 Dec 2020

Find The Missing IDs Problem

LeetCode 1613. Write an SQL query to find the missing...

23 Dec 2020

Exchange Seats Problem

LeetCode 626. Mary is a teacher in a middle school...

23 Dec 2020

Customers Who Bought All Products Problem

LeetCode 1045. Write an SQL query for a report that...

23 Dec 2020

Active Business Problem

LeetCode 1126. Write an SQL query to find all active...

23 Dec 2020

The Most Recent Three Orders Problem

LeetCode 1532. Write an SQL query to find the most...

22 Dec 2020

Restaurant Growth Problem

LeetCode 1321. You are the restaurant owner and you want...

22 Dec 2020

Project Employees III Problem

LeetCode 1077. Write an SQL query that reports the most...

22 Dec 2020

Number Of Trusted Contacts Of A Customer Problem

LeetCode 1364. Write an SQL query to find the following...

22 Dec 2020

NPV Queries Problem

LeetCode 1421. Write an SQL query to find the npv...

22 Dec 2020

Last Person To Fit In The Elevator Problem

LeetCode 1204. Write an SQL query to find the person_name...

22 Dec 2020

Highest Grade For Each Student Problem

LeetCode 1112. Write a SQL query to find the highest...

22 Dec 2020

Evaluate Boolean Expression Problem

LeetCode 1440. Write an SQL query to evaluate the boolean...

22 Dec 2020

Calculate Salaries Problem

LeetCode 1468. Write an SQL query to find the salaries...

22 Dec 2020

Activity Participants Problem

LeetCode 1355. Write an SQL query to find the names...

22 Dec 2020

User Activity For The Past 30 Days II Problem

LeetCode 1142. Write an SQL query to find the average...

21 Dec 2020

The Most Frequently Ordered Products For Each Customer Problem

LeetCode 1596. Write an SQL query to find the most...

21 Dec 2020

Running Total For Different Genders Problem

LeetCode 1308. Write an SQL query to find the total...

21 Dec 2020

Friendly Movies Streamed Last Month Problem

LeetCode 1495. Write an SQL query to report the distinct...

21 Dec 2020

Friend Requests I: Overall Acceptance Rate Problem

LeetCode 597. Write an SQL query to find the overall...

21 Dec 2020

Find The Start And End Number Of Continuous Ranges Problem

LeetCode 1285. Write an SQL query to find the start...

21 Dec 2020

Customers Who Bought Products A And B But Not C Problem

LeetCode 1398. Write an SQL query to report the customer_id...

21 Dec 2020

Classes More Than 5 Students Problem

LeetCode 596. Please list out all classes which have more...

21 Dec 2020

Capital Gain/Loss Problem

LeetCode 1393. Write an SQL query to report the Capital...

21 Dec 2020

Biggest Single Number Problem

LeetCode 619. Table my_numbers contains many numbers in column num...

21 Dec 2020

Apples & Oranges Problem

LeetCode 1445. Write an SQL query to report the difference...

21 Dec 2020

All People Report To The Given Manager Problem

LeetCode 1270. Write an SQL query to find employee_id of...

21 Dec 2020

Weather Type In Each Country Problem

LeetCode 1294. Write an SQL query to find the type...

20 Dec 2020

User Activity For The Past 30 Days I Problem

LeetCode 1141. Write an SQL query to find the daily...

20 Dec 2020

Triangle Judgement Problem

LeetCode 610. A pupil Tim gets homework to identify whether...

20 Dec 2020

Students And Examinations Problem

LeetCode 1280. Write an SQL query to find the number...

20 Dec 2020

Sales Person Problem

LeetCode 607. Given three tables, salesperson, company, orders.

20 Dec 2020

Sales Analysis III Problem

LeetCode 1084. Write an SQL query that reports the products...

20 Dec 2020

Sales Analysis II Problem

LeetCode 1083. Write an SQL query that reports the buyers...

20 Dec 2020

Reported Posts Problem

LeetCode 1113. Write an SQL query that reports the number...

20 Dec 2020

Queries Quality And Percentage Problem

LeetCode 1211. Write an SQL query to find each query_name,...

20 Dec 2020

Project Employees II Problem

LeetCode 1076. Write an SQL query that reports all the...

20 Dec 2020

Project Employees I Problem

LeetCode 1075. Write an SQL query that reports the average...

20 Dec 2020

Number Of Comments Per Post Problem

LeetCode 1241. Write an SQL query to find number of...

20 Dec 2020

Not Boring Movies Problem

LeetCode 620. X city opened a new cinema, many people...

20 Dec 2020

Fix Product Name Format Problem

LeetCode 1543. Write an SQL query to report product_name in...

20 Dec 2020

Consecutive Available Seats Problem

LeetCode 603. Several friends at a cinema ticket office would...

20 Dec 2020

Ads Performance Problem

LeetCode 1322. A company is running Ads and wants to...

20 Dec 2020

Top Travellers Problem

LeetCode 1407. Write an SQL query to report the distance...

19 Dec 2020

Swap Salary Problem

LeetCode 627. Given a table salary, such as the one...

19 Dec 2020

Shortest Distance Problem

LeetCode 613. Write a query to find the shortest distance...

19 Dec 2020

Sales Analysis I Problem

LeetCode 1082. Write an SQL query that reports the best...

19 Dec 2020

Reformat Department Table Problem

LeetCode 1179. Write an SQL query to reformat the table...

19 Dec 2020

Product Sales Analysis II Problem

LeetCode 1069. Write an SQL query that reports the total...

19 Dec 2020

Product Sales Analysis I Problem

LeetCode 1068. Write an SQL query that reports all product...

19 Dec 2020

List The Products Ordered In A Period Problem

LeetCode 1327. Write an SQL query to get the names...

19 Dec 2020

Immediate Food Delivery I Problem

LeetCode 1173. Write an SQL query to find the percentage...

19 Dec 2020

Find Users With Valid Emails Problem

LeetCode 1517. Write an SQL query to find the users...

19 Dec 2020

Find Customer Referee Problem

LeetCode 584. Given a table customer holding customers information and...

19 Dec 2020

Customer Placing The Largest Number Of Orders Problem

LeetCode 586. Query the customer_number from the orders table for...

19 Dec 2020

Customer Order Frequency Problem

LeetCode 1511. Write an SQL query to report the customer_id...

19 Dec 2020

Create A Session Bar Chart Problem

LeetCode 1435. You want to know how long a user...

19 Dec 2020

Big Countries Problem

LeetCode 595. Write a SQL solution to output big countries’...

19 Dec 2020

Average Selling Price Problem

LeetCode 1251. Write an SQL query to find the average...

19 Dec 2020

Article Views I Problem

LeetCode 1148. Write an SQL query to find all the...

19 Dec 2020

Actors And Directors Who Cooperated At Least Three Times Problem

LeetCode 1050. Write a SQL query for a report that...

19 Dec 2020

Unique Orders And Customers Per Month Problem

LeetCode 1565. Write an SQL query to find the number...

18 Dec 2020

Sellers With No Sales Problem

LeetCode 1607. Write an SQL query to report the names...

18 Dec 2020

Rising Temperature Problem

LeetCode 197. Write an SQL query to find all dates’...

18 Dec 2020

Game Play Analysis IV Problem

LeetCode 550. Write an SQL query that reports the fraction...

18 Dec 2020

Game Play Analysis III Problem

LeetCode 534. Write an SQL query that reports for each...

18 Dec 2020

Game Play Analysis II Problem

LeetCode 512. Write a SQL query that reports the device...

18 Dec 2020

Game Play Analysis I Problem

LeetCode 511. Write an SQL query that reports the first...

18 Dec 2020

Employee Bonus Problem

LeetCode 577. Select all employee’s name and bonus whose bonus...

18 Dec 2020

Delete Duplicate Emails Problem

LeetCode 196. Write a SQL query to delete all duplicate...

18 Dec 2020

Daily Leads And Partners Problem

LeetCode 1693. Write an SQL query that will, for each...

18 Dec 2020

Customer Who Visited But Did Not Make Any Transactions Problem

LeetCode 1581. Write an SQL query to find the IDs...

18 Dec 2020

Product's Worth Over Invoices Problem

LeetCode 1677. Write an SQL query that will, for all...

17 Dec 2020

Percentage Of Users Attended A Contest Problem

LeetCode 1633. Write an SQL query to find the percentage...

17 Dec 2020

Fix Names In A Table Problem

LeetCode 1667. Write an SQL query to fix the names...

17 Dec 2020

Duplicate Emails Problem

LeetCode 182. Write a SQL query to find all duplicate...

17 Dec 2020

Customers Who Never Order Problem

LeetCode 183. Write a SQL query to find all customers...

17 Dec 2020

Consecutive Numbers Problem

LeetCode 180. Write an SQL query to find all numbers...

17 Dec 2020

Average Time Of Process Per Machine Problem

LeetCode 1661. There is a factory website that has several...

17 Dec 2020

Second Highest Salary Problem

LeetCode 176. Given the Employee table, write a SQL query...

16 Dec 2020

Employees Earning More Than Their Managers Problem

LeetCode 181. Given the Employee table, write a SQL query...

16 Dec 2020

Bank Account Summary II Problem

LeetCode 1587. Write an SQL query to report the name...

16 Dec 2020

Group Sold Products By The Date Problem

LeetCode 1484. Write an SQL query to find for each...

15 Dec 2020

All Valid Triplets That Can Represent A Country Problem

LeetCode 1623. Write an SQL query to find all the...

15 Dec 2020

Warehouse Manager Problem

LeetCode 1571. Write an SQL query to report how much...

13 Dec 2020

Students With Invalid Departments Problem

LeetCode 1350. Write an SQL query to find the id...

13 Dec 2020

Replace Employee ID With The Unique Identifier Problem

LeetCode 1378. Write an SQL query to show the unique...

13 Dec 2020

Patients With A Condition Problem

LeetCode 1527. Write an SQL query to report the patient_id,...

13 Dec 2020

Invalid Tweets Problem

LeetCode 1683. Write an SQL query to find the IDs...

13 Dec 2020

Find The Team Size Problem

LeetCode 1303. Write an SQL query to find the team...

13 Dec 2020

Combine Two Tables Problem

LeetCode 175. Write a SQL query for a report that...

13 Dec 2020

Maximum Equal Frequency Problem

LeetCode 1224. Given an array nums of positive integers, return...

08 Dec 2020

Number of Islands Problem

LeetCode 200. Given an m x n 2d grid map...

02 Dec 2020

Merge Intervals Problem

LeetCode 56. Given an array of intervals, merge all overlapping...

02 Dec 2020

Longest Continuous Subarray With Absolute Diff Less Than Or Equal To Limit Problem

LeetCode 1438. Given an array of integers nums and an...

02 Dec 2020

Diameter of Binary Tree Problem

LeetCode 543. Given a binary tree, compute the diameter of...

02 Dec 2020

Reverse Linked List Problem

LeetCode 206. Reverse a singly linked list.

26 Nov 2020

Reverse Linked List II Problem

LeetCode 92. Reverse a linked list from position m to...

26 Nov 2020

Palindrome Linked List Problem

LeetCode 234. Given a singly linked list, determine if it’s...

26 Nov 2020

Merge K Sorted Lists Problem

LeetCode 23. You are given an array of k linked-lists...

26 Nov 2020

Merge Two Sorted Lists Problem

LeetCode 21. Merge two sorted linked lists and return a...

25 Nov 2020

Median of Two Sorted Arrays Problem

LeetCode 4. Given two sorted arrays nums1 and nums2 of...

20 Nov 2020

Valid Perfect Square Problem

LeetCode 367. Given a positive integer num, write a function...

15 Nov 2020

Sqrt(x) Problem

LeetCode 69. Given a non-negative integer x, compute and return...

15 Nov 2020

Search Insert Position Problem

LeetCode 35. Given a sorted array of distinct integers and...

15 Nov 2020

Stream of Characters Problem

LeetCode 1032. Implement the StreamChecker class as follows. Constructor, initialize...

14 Nov 2020

Maximum XOR of Two Numbers in an Array Problem

LeetCode 421. Given an integer array nums, return the maximum...

14 Nov 2020

Implement Trie (Prefix Tree) Problem

LeetCode 208. Implement a Trie with insert, search, and startsWith...

14 Nov 2020

Camelcase Matching Problem

LeetCode 1023. A query word matches a given pattern if...

14 Nov 2020

Word Search II Problem

LeetCode 212. Given an m x n board of characters...

12 Nov 2020

Two Sum Input Array Is Sorted Problem

LeetCode 167. Given an array of integers nums sorted in...

12 Nov 2020

Subarray Sum Divisible By K Problem

LeetCode 974. Given an array of integers nums and an...

12 Nov 2020

Replace Words Problem

LeetCode 648. Given a dictionary consisting of many roots, and...

12 Nov 2020

Longest Word In Dictionary Problem

LeetCode 720. Given a list of strings words representing an...

12 Nov 2020

Four Sum II Problem

LeetCode 454. Given four lists A, B, C, D of...

12 Nov 2020

Continuous Subarray Sum Problem

LeetCode 523. Given an array of non-negative integers nums and...

12 Nov 2020

Concatenate Words Problem

LeetCode 472. Given a list of words (without duplicates), return...

12 Nov 2020

Two Sum Less Than K Problem

LeetCode 1099. Given an array of integers nums and an...

11 Nov 2020

Subarray Sum Equals K Problem

LeetCode 560. Given an array of integers nums and an...

11 Nov 2020

Subarray Product Less Than K Problem

LeetCode 713. Given an array of positive integers nums and...

11 Nov 2020

Three Sum Problem

LeetCode 15. Given an array of integers nums, return all...

10 Nov 2020

Four Sum Problem

LeetCode 18. Given an array of integers nums and an...

10 Nov 2020

Two Sum Problem

LeetCode 1. Given an array of integers nums and an...