Find The Difference Problem
Description
LeetCode Problem 389.
You are given two strings s and t.
String t is generated by random shuffling string s and then add one more letter at a random position.
Return the letter that was added to t.
Example 1:
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Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.
Example 2:
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Input: s = "", t = "y"
Output: "y"
Example 3:
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Input: s = "a", t = "aa"
Output: "a"
Example 4:
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Input: s = "ae", t = "aea"
Output: "a"
Constraints:
- 0 <= s.length <= 1000
- t.length == s.length + 1
- s and t consist of lower-case English letters.
Sample C++ Code
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class Solution {
public:
char findTheDifference(string s, string t) {
int n = 0;
for (int i = 0; i < s.size(); i ++) {
n ^= (s[i] - 'a');
}
for (int i = 0; i < t.size(); i ++) {
n ^= (t[i] - 'a');
}
char c = (char)('a' + n);
return c;
}
};