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383. Ransom Note.md

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思路

用一个大小为26的数组count记录magazine中26个字母的出现次数,只要每个字母出现次数不小于ransomNote对应字母次数就行了。

C++

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