771.宝石与石头

😂代码实现

class Solution {
public:
    int numJewelsInStones(string J, string S) {
        set<char> mp;
        for(auto x : J) {
            mp.insert(x);
        }
        int tl = 0;
        for(auto a: S) {
            if(mp.count(a) > 0) {
                tl += 1;
            }
        }
        return tl;
    }
};

Accepted

254/254 cases passed (8 ms)

Your runtime beats 25.05 % of cpp submissions

Your memory usage beats 5.26 % of cpp submissions (8.8 MB)