LeetCode：Find the Difference

Given two strings s and t which consist of only lowercase letters.

String t is generated by random shuffling string s and then add one more letter at a random position.

Find the letter that was added in t.

Example:

Input:
s = “abcd”
t = “abcde”

Output:
e

Explanation:
‘e’ is the letter that was added.

class Solution {
public:
    char findTheDifference(string s, string t) {
        char res;
        char count[256] = {0};
        int i;
        for(int i=0;i<s.length();++i)
        {
            count[s[i]]++;
        }
        for(i=0;i<t.length();++i)
        {
           if(count[t[i]]<=0)
              break;
           else
              count[t[i]]--;//可以达到去重的功能
        }
      return t[i];
    }
};