You are given an array of strings words and a string chars.
A string is good if it can be formed by characters from chars (each character can only be used once).
\n\nReturn the sum of lengths of all good strings in words.
\n\n\n
Example 1:
\n\n\nInput: words = ["cat","bt","hat","tree"], chars = "atach"\nOutput: 6\nExplanation: The strings that can be formed are "cat" and "hat" so the answer is 3 + 3 = 6.\n\n\n
Example 2:
\n\n\nInput: words = ["hello","world","leetcode"], chars = "welldonehoneyr"\nOutput: 10\nExplanation: The strings that can be formed are "hello" and "world" so the answer is 5 + 5 = 10.\n\n\n
\n
Constraints:
\n\n1 <= words.length <= 10001 <= words[i].length, chars.length <= 100words[i] and chars consist of lowercase English letters.给你一份『词汇表』（字符串数组） words 和一张『字母表』（字符串） chars。
假如你可以用 chars 中的『字母』（字符）拼写出 words 中的某个『单词』（字符串），那么我们就认为你掌握了这个单词。
注意：每次拼写（指拼写词汇表中的一个单词）时，chars 中的每个字母都只能用一次。
返回词汇表 words 中你掌握的所有单词的 长度之和。
\n\n
示例 1：
\n\n输入：words = ["cat","bt","hat","tree"], chars = "atach"\n输出：6\n解释： \n可以形成字符串 "cat" 和 "hat"，所以答案是 3 + 3 = 6。\n\n\n
示例 2：
\n\n输入：words = ["hello","world","leetcode"], chars = "welldonehoneyr"\n输出：10\n解释：\n可以形成字符串 "hello" 和 "world"，所以答案是 5 + 5 = 10。\n\n\n
\n\n
提示：
\n\n1 <= words.length <= 10001 <= words[i].length, chars.length <= 100words independently.",
"Now try to think in frequency of letters.",
"Count how many times each character occurs in string chars.",
"To form a string using characters from chars, the frequency of each character in chars must be greater than or equal the frequency of that character in the string to be formed."
],
"solution": null,
"status": null,
"sampleTestCase": "[\"cat\",\"bt\",\"hat\",\"tree\"]\n\"atach\"",
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