mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
16 KiB
JSON
186 lines
16 KiB
JSON
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"title": "Minimum Additions to Make Valid String",
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"content": "<p>Given a string <code>word</code> to which you can insert letters "a", "b" or "c" anywhere and any number of times, return <em>the minimum number of letters that must be inserted so that <code>word</code> becomes <strong>valid</strong>.</em></p>\n\n<p>A string is called <strong>valid </strong>if it can be formed by concatenating the string "abc" several times.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "b"\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> Insert the letter "a" right before "b", and the letter "c" right next to "a" to obtain the valid string "<strong>a</strong>b<strong>c</strong>".\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "aaa"\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> Insert letters "b" and "c" next to each "a" to obtain the valid string "a<strong>bc</strong>a<strong>bc</strong>a<strong>bc</strong>".\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "abc"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> word is already valid. No modifications are needed. \n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= word.length <= 50</code></li>\n\t<li><code>word</code> consists of letters "a", "b" and "c" only. </li>\n</ul>\n",
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"exampleTestcases": "\"b\"\n\"aaa\"\n\"abc\"",
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"categoryTitle": "Algorithms",
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"code": "# @param {String} word\n# @return {Integer}\ndef add_minimum(word)\n \nend",
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"code": "-spec add_minimum(Word :: unicode:unicode_binary()) -> integer().\nadd_minimum(Word) ->\n .",
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"code": "defmodule Solution do\n @spec add_minimum(word :: String.t) :: integer\n def add_minimum(word) do\n\n end\nend",
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"hints": [
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"Maintain a pointer on word and another pointer on string “abc”.",
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"If the two characters that are being pointed to differ, Increment the answer and the pointer to the string “abc” by one."
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],
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"sampleTestCase": "\"b\"",
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