mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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176 lines
18 KiB
JSON
176 lines
18 KiB
JSON
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"question": {
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"questionId": "3018",
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"questionFrontendId": "2825",
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"boundTopicId": null,
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"title": "Make String a Subsequence Using Cyclic Increments",
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"titleSlug": "make-string-a-subsequence-using-cyclic-increments",
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"content": "<p>You are given two <strong>0-indexed</strong> strings <code>str1</code> and <code>str2</code>.</p>\n\n<p>In an operation, you select a <strong>set</strong> of indices in <code>str1</code>, and for each index <code>i</code> in the set, increment <code>str1[i]</code> to the next character <strong>cyclically</strong>. That is <code>'a'</code> becomes <code>'b'</code>, <code>'b'</code> becomes <code>'c'</code>, and so on, and <code>'z'</code> becomes <code>'a'</code>.</p>\n\n<p>Return <code>true</code> <em>if it is possible to make </em><code>str2</code> <em>a subsequence of </em><code>str1</code> <em>by performing the operation <strong>at most once</strong></em>, <em>and</em> <code>false</code> <em>otherwise</em>.</p>\n\n<p><strong>Note:</strong> A subsequence of a string is a new string that is formed from the original string by deleting some (possibly none) of the characters without disturbing the relative positions of the remaining characters.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> str1 = "abc", str2 = "ad"\n<strong>Output:</strong> true\n<strong>Explanation:</strong> Select index 2 in str1.\nIncrement str1[2] to become 'd'. \nHence, str1 becomes "abd" and str2 is now a subsequence. Therefore, true is returned.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> str1 = "zc", str2 = "ad"\n<strong>Output:</strong> true\n<strong>Explanation:</strong> Select indices 0 and 1 in str1. \nIncrement str1[0] to become 'a'. \nIncrement str1[1] to become 'd'. \nHence, str1 becomes "ad" and str2 is now a subsequence. Therefore, true is returned.</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> str1 = "ab", str2 = "d"\n<strong>Output:</strong> false\n<strong>Explanation:</strong> In this example, it can be shown that it is impossible to make str2 a subsequence of str1 using the operation at most once. \nTherefore, false is returned.</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= str1.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= str2.length <= 10<sup>5</sup></code></li>\n\t<li><code>str1</code> and <code>str2</code> consist of only lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abc\"\n\"ad\"\n\"zc\"\n\"ad\"\n\"ab\"\n\"d\"",
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"categoryTitle": "Algorithms",
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"code": "# @param {String} str1\n# @param {String} str2\n# @return {Boolean}\ndef can_make_subsequence(str1, str2)\n \nend",
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"code": "impl Solution {\n pub fn can_make_subsequence(str1: String, str2: String) -> bool {\n \n }\n}",
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"code": "-spec can_make_subsequence(Str1 :: unicode:unicode_binary(), Str2 :: unicode:unicode_binary()) -> boolean().\ncan_make_subsequence(Str1, Str2) ->\n .",
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"code": "defmodule Solution do\n @spec can_make_subsequence(str1 :: String.t, str2 :: String.t) :: boolean\n def can_make_subsequence(str1, str2) do\n\n end\nend",
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"hints": [
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"<div class=\"_1l1MA\">Consider the indices we will increment separately.</div>",
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"<div class=\"_1l1MA\">We can maintain two pointers: pointer <code>i</code> for <code>str1</code> and pointer <code>j</code> for <code>str2</code>, while ensuring they remain within the bounds of the strings.</div>",
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"<div class=\"_1l1MA\">If both <code>str1[i]</code> and <code>str2[j]</code> match, or if incrementing <code>str1[i]</code> matches <code>str2[j]</code>, we increase both pointers; otherwise, we increment only pointer <code>i</code>.</div>",
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"<div class=\"_1l1MA\">It is possible to make <code>str2</code> a subsequence of <code>str1</code> if <code>j</code> is at the end of <code>str2</code>, after we can no longer find a match.</div>"
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],
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"sampleTestCase": "\"abc\"\n\"ad\"",
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