leetcode2sumc 1160. find words that can be formed by characters

leetcode 2和c 1160.-find-words-that-can-be-formed-by-characters-c-map。leetcode给你一个字符串数组words和一个字符串chars。如果字符串可以由字符中的字符组成（每个字符只能使用一次），则该字符串是好的。返回单词中所有好的字符串的长度总和。

示例1：

输入：words = ["cat","bt","hat","tree"]，chars = "atach"

输出：6

解释：可以组成的字符串是“cat”和“hat”，所以答案是3 + 3 = 6。

示例2：

输入：words = ["hello","world","leetcode"]，chars = "welldoneyr"

输出：10

解释：可以组成的字符串是"hello"和"world"，所以答案是5 + 5 = 10。