Simple C++ Solution by Counting Letters, O(n + m), 3 ms


  • 0
    M
    class Solution {
    public:
        char findTheDifference(string s, string t) {
            vector<int> cnt(128);
            for (char c: s) ++cnt[c];
            for (char c: t) if (cnt[c] <= 0) return c; else --cnt[c];
            return 0;
        }
    };
    

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