mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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192 lines
22 KiB
JSON
192 lines
22 KiB
JSON
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"questionId": "3487",
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"title": "Find Maximum Removals From Source String",
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"content": "<p>You are given a string <code>source</code> of size <code>n</code>, a string <code>pattern</code> that is a <span data-keyword=\"subsequence-string\">subsequence</span> of <code>source</code>, and a <strong>sorted</strong> integer array <code>targetIndices</code> that contains <strong>distinct</strong> numbers in the range <code>[0, n - 1]</code>.</p>\n\n<p>We define an <strong>operation</strong> as removing a character at an index <code>idx</code> from <code>source</code> such that:</p>\n\n<ul>\n\t<li><code>idx</code> is an element of <code>targetIndices</code>.</li>\n\t<li><code>pattern</code> remains a <span data-keyword=\"subsequence-string\">subsequence</span> of <code>source</code> after removing the character.</li>\n</ul>\n\n<p>Performing an operation <strong>does not</strong> change the indices of the other characters in <code>source</code>. For example, if you remove <code>'c'</code> from <code>"acb"</code>, the character at index 2 would still be <code>'b'</code>.</p>\n\n<p>Return the <strong>maximum</strong> number of <em>operations</em> that can be performed.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">source = "abbaa", pattern = "aba", </span>targetIndices<span class=\"example-io\"> = [0,1,2]</span></p>\n\n<p><strong>Output:</strong> 1</p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>We can't remove <code>source[0]</code> but we can do either of these two operations:</p>\n\n<ul>\n\t<li>Remove <code>source[1]</code>, so that <code>source</code> becomes <code>"a_baa"</code>.</li>\n\t<li>Remove <code>source[2]</code>, so that <code>source</code> becomes <code>"ab_aa"</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">source = "bcda", pattern = "d", </span>targetIndices<span class=\"example-io\"> = [0,3]</span></p>\n\n<p><strong>Output:</strong> 2</p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>We can remove <code>source[0]</code> and <code>source[3]</code> in two operations.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">source = "dda", pattern = "dda", </span>targetIndices<span class=\"example-io\"> = [0,1,2]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>We can't remove any character from <code>source</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">source = </span>"yeyeykyded"<span class=\"example-io\">, pattern = </span>"yeyyd"<span class=\"example-io\">, </span>targetIndices<span class=\"example-io\"> = </span>[0,2,3,4]</p>\n\n<p><strong>Output:</strong> 2</p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>We can remove <code>source[2]</code> and <code>source[3]</code> in two operations.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n == source.length <= 3 * 10<sup>3</sup></code></li>\n\t<li><code>1 <= pattern.length <= n</code></li>\n\t<li><code>1 <= targetIndices.length <= n</code></li>\n\t<li><code>targetIndices</code> is sorted in ascending order.</li>\n\t<li>The input is generated such that <code>targetIndices</code> contains distinct elements in the range <code>[0, n - 1]</code>.</li>\n\t<li><code>source</code> and <code>pattern</code> consist only of lowercase English letters.</li>\n\t<li>The input is generated such that <code>pattern</code> appears as a subsequence in <code>source</code>.</li>\n</ul>\n",
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"exampleTestcases": "\"abbaa\"\n\"aba\"\n[0,1,2]\n\"bcda\"\n\"d\"\n[0,3]\n\"dda\"\n\"dda\"\n[0,1,2]\n\"yeyeykyded\"\n\"yeyyd\"\n[0,2,3,4]",
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"code": "# @param {String} source\n# @param {String} pattern\n# @param {Integer[]} target_indices\n# @return {Integer}\ndef max_removals(source, pattern, target_indices)\n \nend",
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"Use dynamic programming.",
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"At each index in <code>targetIndices</code>, make the choice to remove or not remove the character."
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|
|
}
|
|
} |