代码随想录：赎金信

同上题

class Solution {
public:
    bool canConstruct(string ransomNote, string magazine) {
        //其实就26个字母可以用数组的，懒得改了
        unordered_map<char, int> maga;
        for (char c : magazine) {
            auto it = maga.find(c);
            if (it != maga.end()) {
                it->second++;
            } else {
                maga.insert(make_pair(c, 1));
            }
        }

        for (char c : ransomNote) {
            auto it = maga.find(c);
            if (it != maga.end()) {
                if (it->second > 0) {
                    it->second--;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }
        return true;
    }
};