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"title": "Minimum Number of Frogs Croaking",
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"content": "<p>You are given the string <code>croakOfFrogs</code>, which represents a combination of the string <code>"croak"</code> from different frogs, that is, multiple frogs can croak at the same time, so multiple <code>"croak"</code> are mixed.</p>\n\n<p><em>Return the minimum number of </em>different<em> frogs to finish all the croaks in the given string.</em></p>\n\n<p>A valid <code>"croak"</code> means a frog is printing five letters <code>'c'</code>, <code>'r'</code>, <code>'o'</code>, <code>'a'</code>, and <code>'k'</code> <strong>sequentially</strong>. The frogs have to print all five letters to finish a croak. If the given string is not a combination of a valid <code>"croak"</code> return <code>-1</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> croakOfFrogs = "croakcroak"\n<strong>Output:</strong> 1 \n<strong>Explanation:</strong> One frog yelling "croak<strong>"</strong> twice.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> croakOfFrogs = "crcoakroak"\n<strong>Output:</strong> 2 \n<strong>Explanation:</strong> The minimum number of frogs is two. \nThe first frog could yell "<strong>cr</strong>c<strong>oak</strong>roak".\nThe second frog could yell later "cr<strong>c</strong>oak<strong>roak</strong>".\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> croakOfFrogs = "croakcrook"\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> The given string is an invalid combination of "croak<strong>"</strong> from different frogs.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= croakOfFrogs.length <= 10<sup>5</sup></code></li>\n\t<li><code>croakOfFrogs</code> is either <code>'c'</code>, <code>'r'</code>, <code>'o'</code>, <code>'a'</code>, or <code>'k'</code>.</li>\n</ul>\n",
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"code": "class Solution {\npublic:\n int minNumberOfFrogs(string croakOfFrogs) {\n \n }\n};",
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"code": "class Solution(object):\n def minNumberOfFrogs(self, croakOfFrogs):\n \"\"\"\n :type croakOfFrogs: str\n :rtype: int\n \"\"\"\n ",
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"keep the frequency of all characters from \"croak\" using a hashmap.",
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