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 for each word in words).
Return 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.给定一个字符串数组 words 和一个字符串 chars。
如果字符串可以由 chars 中的字符组成（每个字符在 每个 words 中只能使用一次），则认为它是好的。
返回 words 中所有好的字符串的长度之和。
\n\n
示例 1：
\n\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\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[i] 和 chars 中都仅包含小写英文字母words 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\"",
"metaData": "{\n \"name\": \"countCharacters\",\n \"params\": [\n {\n \"name\": \"words\",\n \"type\": \"string[]\"\n },\n {\n \"name\": \"chars\",\n \"type\": \"string\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n }\n}\n",
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"style": "LEETCODE",
"exampleTestcases": "[\"cat\",\"bt\",\"hat\",\"tree\"]\n\"atach\"\n[\"hello\",\"world\",\"leetcode\"]\n\"welldonehoneyr\"",
"__typename": "QuestionNode"
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