LeetCode 1160. 拼写单词

示例 1：

输入：words = ["cat","bt","hat","tree"], chars = "atach"
输出：6
解释： 
可以形成字符串 "cat" 和 "hat"，所以答案是 3 + 3 = 6。
示例 2：

输入：words = ["hello","world","leetcode"], chars = "welldonehoneyr"
输出：10
解释：
可以形成字符串 "hello" 和 "world"，所以答案是 5 + 5 = 10。

class Solution {
public:
    int countCharacters(vector<string>& words, string chars) {
        int count[26] = {0}, wordcount[26];
        int i, j, ans = 0;
        bool hasthisword;
        for(i = 0; i < chars.size(); ++i)
        {
        	count[chars[i]-'a']++;
        }
        for(i = 0; i < words.size(); ++i)
        {
        	hasthisword = true;
        	memset(wordcount,0,sizeof(int)*26);
        	for(j = 0; j < words[i].size(); ++j)
        	{
        		wordcount[words[i][j]-'a']++;
        	}
        	for(j = 0; j < 26; ++j)
        	{
        		if(wordcount[j] > count[j])
        		{
        			hasthisword = false;
        			break;
        		}
        	}
        	if(hasthisword)
        		ans += words[i].size();
        }
        return ans;
    }
};