383. 赎金信

题目：https://leetcode-cn.com/problems/ransom-note/

想法：与”242.有效的字母异位词“一样

代码：

C++版本：
bool canConstruct(string ransomNote, string magazine) {
    int dictionary[26] = {0};
    for (int i = 0; i < magazine.size(); i++) {
        dictionary[magazine[i] - 'a']++;
    }
    for (int i = 0; i < ransomNote.size(); i++) {
        dictionary[ransomNote[i] - 'a']--;
    }
    for (int i = 0; i < 26; i++) {
        if (dictionary[i] < 0) return false;
    }
    return true;
}