mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
181 lines
17 KiB
JSON
181 lines
17 KiB
JSON
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"title": "Subsequence With the Minimum Score",
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"content": "<p>You are given two strings <code>s</code> and <code>t</code>.</p>\n\n<p>You are allowed to remove any number of characters from the string <code>t</code>.</p>\n\n<p>The score of the string is <code>0</code> if no characters are removed from the string <code>t</code>, otherwise:</p>\n\n<ul>\n\t<li>Let <code>left</code> be the minimum index among all removed characters.</li>\n\t<li>Let <code>right</code> be the maximum index among all removed characters.</li>\n</ul>\n\n<p>Then the score of the string is <code>right - left + 1</code>.</p>\n\n<p>Return <em>the minimum possible score to make </em><code>t</code><em> a subsequence of </em><code>s</code><em>.</em></p>\n\n<p>A <strong>subsequence</strong> of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., <code>"ace"</code> is a subsequence of <code>"<u>a</u>b<u>c</u>d<u>e</u>"</code> while <code>"aec"</code> is not).</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abacaba", t = "bzaa"\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> In this example, we remove the character "z" at index 1 (0-indexed).\nThe string t becomes "baa" which is a subsequence of the string "abacaba" and the score is 1 - 1 + 1 = 1.\nIt can be proven that 1 is the minimum score that we can achieve.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "cde", t = "xyz"\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> In this example, we remove characters "x", "y" and "z" at indices 0, 1, and 2 (0-indexed).\nThe string t becomes "" which is a subsequence of the string "cde" and the score is 2 - 0 + 1 = 3.\nIt can be proven that 3 is the minimum score that we can achieve.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length, t.length <= 10<sup>5</sup></code></li>\n\t<li><code>s</code> and <code>t</code> consist of only lowercase English letters.</li>\n</ul>\n",
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"exampleTestcases": "\"abacaba\"\n\"bzaa\"\n\"cde\"\n\"xyz\"",
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"categoryTitle": "Algorithms",
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"code": "-spec minimum_score(S :: unicode:unicode_binary(), T :: unicode:unicode_binary()) -> integer().\nminimum_score(S, T) ->\n .",
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"hints": [
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"Maintain two pointers: i and j. We need to perform a similar operation: while t[0:i] + t[j:n] is not a subsequence of the string s, increase j.",
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"We can check the condition greedily. Create the array leftmost[i] which denotes minimum index k, such that in prefix s[0:k] exists subsequence t[0:i]. Similarly, we define rightmost[i].",
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"If leftmost[i] < rightmost[j] then t[0:i] + t[j:n] is the subsequence of s."
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"sampleTestCase": "\"abacaba\"\n\"bzaa\"",
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