一、题目
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:
Input: s = “abcd”, t = “abcde”
Output: “e”
Explanation: ‘e’ is the letter that was added.
Example 2:
Input: s = “”, t = “y”
Output: “y”
Constraints:
0 <= s.length <= 1000
t.length == s.length + 1
s and t consist of lowercase English letters.
二、题解
class Solution {
public:
char findTheDifference(string s, string t) {
unordered_map<char,int> map1;
unordered_map<char,int> map2;
for(auto x:s){
map1[x]++;
}
for(auto x:t){
map2[x]++;
}
for(int i = 0;i < 26;i++){
if(map1['a' + i] != map2['a' + i]) return 'a' + i;
}
return 'a';
}
};
