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": "2309",
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"title": "Maximize Number of Subsequences in a String",
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"titleSlug": "maximize-number-of-subsequences-in-a-string",
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"content": "<p>You are given a <strong>0-indexed</strong> string <code>text</code> and another <strong>0-indexed</strong> string <code>pattern</code> of length <code>2</code>, both of which consist of only lowercase English letters.</p>\n\n<p>You can add <strong>either</strong> <code>pattern[0]</code> <strong>or</strong> <code>pattern[1]</code> anywhere in <code>text</code> <strong>exactly once</strong>. Note that the character can be added even at the beginning or at the end of <code>text</code>.</p>\n\n<p>Return <em>the <strong>maximum</strong> number of times</em> <code>pattern</code> <em>can occur as a <strong>subsequence</strong> of the modified </em><code>text</code>.</p>\n\n<p>A <b>subsequence</b> is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> text = "abdcdbc", pattern = "ac"\n<strong>Output:</strong> 4\n<strong>Explanation:</strong>\nIf we add pattern[0] = 'a' in between text[1] and text[2], we get "ab<u><strong>a</strong></u>dcdbc". Now, the number of times "ac" occurs as a subsequence is 4.\nSome other strings which have 4 subsequences "ac" after adding a character to text are "<u><strong>a</strong></u>abdcdbc" and "abd<u><strong>a</strong></u>cdbc".\nHowever, strings such as "abdc<u><strong>a</strong></u>dbc", "abd<u><strong>c</strong></u>cdbc", and "abdcdbc<u><strong>c</strong></u>", although obtainable, have only 3 subsequences "ac" and are thus suboptimal.\nIt can be shown that it is not possible to get more than 4 subsequences "ac" by adding only one character.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> text = "aabb", pattern = "ab"\n<strong>Output:</strong> 6\n<strong>Explanation:</strong>\nSome of the strings which can be obtained from text and have 6 subsequences "ab" are "<u><strong>a</strong></u>aabb", "aa<u><strong>a</strong></u>bb", and "aab<u><strong>b</strong></u>b".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= text.length <= 10<sup>5</sup></code></li>\n\t<li><code>pattern.length == 2</code></li>\n\t<li><code>text</code> and <code>pattern</code> consist only of lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abdcdbc\"\n\"ac\"\n\"aabb\"\n\"ab\"",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\n\n /**\n * @param String $text\n * @param String $pattern\n * @return Integer\n */\n function maximumSubsequenceCount($text, $pattern) {\n \n }\n}",
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"code": "(define/contract (maximum-subsequence-count text pattern)\n (-> string? string? exact-integer?)\n\n )",
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"code": "-spec maximum_subsequence_count(Text :: unicode:unicode_binary(), Pattern :: unicode:unicode_binary()) -> integer().\nmaximum_subsequence_count(Text, Pattern) ->\n .",
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"code": "defmodule Solution do\n @spec maximum_subsequence_count(text :: String.t, pattern :: String.t) :: integer\n def maximum_subsequence_count(text, pattern) do\n\n end\nend",
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"hints": [
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"Find the optimal position to add pattern[0] so that the number of subsequences is maximized. Similarly, find the optimal position to add pattern[1].",
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"For each of the above cases, count the number of times the pattern occurs as a subsequence in text. The larger count is the required answer."
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],
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"solution": null,
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"sampleTestCase": "\"abdcdbc\"\n\"ac\"",
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