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| class Solution {
public:
char findTheDifference(string s, string t) {
map<char, int>count;
for(auto&&c:s){
count[c]++;
}
for(auto&&c:t){
count[c]--;
}
return find_if(count.begin(),count.end(),[&](auto it){return it.second!=0;})->first;
}
};
|