mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
17 KiB
JSON
174 lines
17 KiB
JSON
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"questionId": "2463",
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"boundTopicId": null,
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"title": "Minimum Recolors to Get K Consecutive Black Blocks",
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"content": "<p>You are given a <strong>0-indexed</strong> string <code>blocks</code> of length <code>n</code>, where <code>blocks[i]</code> is either <code>'W'</code> or <code>'B'</code>, representing the color of the <code>i<sup>th</sup></code> block. The characters <code>'W'</code> and <code>'B'</code> denote the colors white and black, respectively.</p>\n\n<p>You are also given an integer <code>k</code>, which is the desired number of <strong>consecutive</strong> black blocks.</p>\n\n<p>In one operation, you can <strong>recolor</strong> a white block such that it becomes a black block.</p>\n\n<p>Return<em> the <strong>minimum</strong> number of operations needed such that there is at least <strong>one</strong> occurrence of </em><code>k</code><em> consecutive black blocks.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> blocks = "WBBWWBBWBW", k = 7\n<strong>Output:</strong> 3\n<strong>Explanation:</strong>\nOne way to achieve 7 consecutive black blocks is to recolor the 0th, 3rd, and 4th blocks\nso that blocks = "BBBBBBBWBW". \nIt can be shown that there is no way to achieve 7 consecutive black blocks in less than 3 operations.\nTherefore, we return 3.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> blocks = "WBWBBBW", k = 2\n<strong>Output:</strong> 0\n<strong>Explanation:</strong>\nNo changes need to be made, since 2 consecutive black blocks already exist.\nTherefore, we return 0.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == blocks.length</code></li>\n\t<li><code>1 <= n <= 100</code></li>\n\t<li><code>blocks[i]</code> is either <code>'W'</code> or <code>'B'</code>.</li>\n\t<li><code>1 <= k <= n</code></li>\n</ul>\n",
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"translatedTitle": null,
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"difficulty": "Easy",
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"exampleTestcases": "\"WBBWWBBWBW\"\n7\n\"WBWBBBW\"\n2",
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"categoryTitle": "Algorithms",
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"code": "class Solution(object):\n def minimumRecolors(self, blocks, k):\n \"\"\"\n :type blocks: str\n :type k: int\n :rtype: int\n \"\"\"\n ",
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"code": "# @param {String} blocks\n# @param {Integer} k\n# @return {Integer}\ndef minimum_recolors(blocks, k)\n \nend",
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"code": "impl Solution {\n pub fn minimum_recolors(blocks: String, k: i32) -> i32 {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param String $blocks\n * @param Integer $k\n * @return Integer\n */\n function minimumRecolors($blocks, $k) {\n \n }\n}",
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"code": "function minimumRecolors(blocks: string, k: number): number {\n\n};",
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"code": "(define/contract (minimum-recolors blocks k)\n (-> string? exact-integer? exact-integer?)\n\n )",
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"code": "-spec minimum_recolors(Blocks :: unicode:unicode_binary(), K :: integer()) -> integer().\nminimum_recolors(Blocks, K) ->\n .",
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"code": "defmodule Solution do\n @spec minimum_recolors(blocks :: String.t, k :: integer) :: integer\n def minimum_recolors(blocks, k) do\n\n end\nend",
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"hints": [
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"Iterate through all possible consecutive substrings of k characters.",
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"Find the number of changes for each substring to make all blocks black, and return the minimum of these."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "\"WBBWWBBWBW\"\n7",
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