Reverse String Problem
Description
LeetCode Problem 344.
Write a function that reverses a string. The input string is given as an array of characters s.
You must do this by modifying the input array in-place with O(1) extra memory.
Example 1:
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Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
Example 2:
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Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]
Constraints:
- 1 <= s.length <= 10^5
- s[i] is a printable ascii character.
Sample C++ Code
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class Solution {
public:
string reverseString(string s) {
int i = 0, j = s.size() - 1;
while(i < j){
swap(s[i++], s[j--]);
}
return s;
}
};