You are given the string croakOfFrogs, which represents a combination of the string "croak" from different frogs, that is, multiple frogs can croak at the same time, so multiple "croak" are mixed.
Return the minimum number of different frogs to finish all the croaks in the given string.
\n\nA valid "croak" means a frog is printing five letters 'c', 'r', 'o', 'a', and 'k' sequentially. The frogs have to print all five letters to finish a croak. If the given string is not a combination of a valid "croak" return -1.
\n
Example 1:
\n\n\nInput: croakOfFrogs = "croakcroak"\nOutput: 1 \nExplanation: One frog yelling "croak" twice.\n\n\n
Example 2:
\n\n\nInput: croakOfFrogs = "crcoakroak"\nOutput: 2 \nExplanation: The minimum number of frogs is two. \nThe first frog could yell "crcoakroak".\nThe second frog could yell later "crcoakroak".\n\n\n
Example 3:
\n\n\nInput: croakOfFrogs = "croakcrook"\nOutput: -1\nExplanation: The given string is an invalid combination of "croak" from different frogs.\n\n\n
\n
Constraints:
\n\n1 <= croakOfFrogs.length <= 105croakOfFrogs is either 'c', 'r', 'o', 'a', or 'k'.给你一个字符串 croakOfFrogs，它表示不同青蛙发出的蛙鸣声（字符串 \"croak\" ）的组合。由于同一时间可以有多只青蛙呱呱作响，所以 croakOfFrogs 中会混合多个 “croak” 。
请你返回模拟字符串中所有蛙鸣所需不同青蛙的最少数目。
\n\n要想发出蛙鸣 \"croak\"，青蛙必须 依序 输出 ‘c’, ’r’, ’o’, ’a’, ’k’ 这 5 个字母。如果没有输出全部五个字母，那么它就不会发出声音。如果字符串 croakOfFrogs 不是由若干有效的 \"croak\" 字符混合而成，请返回 -1 。
\n\n
示例 1：
\n\n\n输入：croakOfFrogs = \"croakcroak\"\n输出：1 \n解释：一只青蛙 “呱呱” 两次\n\n\n
示例 2：
\n\n\n输入：croakOfFrogs = \"crcoakroak\"\n输出：2 \n解释：最少需要两只青蛙，“呱呱” 声用黑体标注\n第一只青蛙 \"crcoakroak\"\n第二只青蛙 \"crcoakroak\"\n\n\n
示例 3：
\n\n\n输入：croakOfFrogs = \"croakcrook\"\n输出：-1\n解释：给出的字符串不是 \"croak\" 的有效组合。\n\n\n
\n\n
提示：
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"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"croakcroak\"\n\"crcoakroak\"\n\"croakcrook\"",
"__typename": "QuestionNode"
}
}
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