383.赎金信

class Solution {
public:
    bool canConstruct(string ransomNote, string magazine) {
        if(ransomNote.size()>magazine.size())
        {
            return false;
        }
        vector<int> cnt(26);
        for(auto & c:magazine)
        {
            cnt[c-'a']++;
        }
        for(auto& c:ransomNote)
        {
            cnt[c-'a']--;
            if(cnt[c-'a']<0)
            {
                return false;
            }
        }
        return true;
    }
};