mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
190 lines
22 KiB
JSON
190 lines
22 KiB
JSON
{
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"questionId": "1308",
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"questionFrontendId": "1202",
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"categoryTitle": "Algorithms",
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"boundTopicId": 28486,
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"title": "Smallest String With Swaps",
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"titleSlug": "smallest-string-with-swaps",
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"content": "<p>You are given a string <code>s</code>, and an array of pairs of indices in the string <code>pairs</code> where <code>pairs[i] = [a, b]</code> indicates 2 indices(0-indexed) of the string.</p>\n\n<p>You can swap the characters at any pair of indices in the given <code>pairs</code> <strong>any number of times</strong>.</p>\n\n<p>Return the lexicographically smallest string that <code>s</code> can be changed to after using the swaps.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "dcab", pairs = [[0,3],[1,2]]\n<strong>Output:</strong> "bacd"\n<strong>Explaination:</strong> \nSwap s[0] and s[3], s = "bcad"\nSwap s[1] and s[2], s = "bacd"\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "dcab", pairs = [[0,3],[1,2],[0,2]]\n<strong>Output:</strong> "abcd"\n<strong>Explaination: </strong>\nSwap s[0] and s[3], s = "bcad"\nSwap s[0] and s[2], s = "acbd"\nSwap s[1] and s[2], s = "abcd"</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "cba", pairs = [[0,1],[1,2]]\n<strong>Output:</strong> "abc"\n<strong>Explaination: </strong>\nSwap s[0] and s[1], s = "bca"\nSwap s[1] and s[2], s = "bac"\nSwap s[0] and s[1], s = "abc"\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 10^5</code></li>\n\t<li><code>0 <= pairs.length <= 10^5</code></li>\n\t<li><code>0 <= pairs[i][0], pairs[i][1] < s.length</code></li>\n\t<li><code>s</code> only contains lower case English letters.</li>\n</ul>\n",
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"translatedTitle": "交换字符串中的元素",
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"translatedContent": "<p>给你一个字符串 <code>s</code>，以及该字符串中的一些「索引对」数组 <code>pairs</code>，其中 <code>pairs[i] = [a, b]</code> 表示字符串中的两个索引（编号从 0 开始）。</p>\n\n<p>你可以 <strong>任意多次交换</strong> 在 <code>pairs</code> 中任意一对索引处的字符。</p>\n\n<p>返回在经过若干次交换后，<code>s</code> 可以变成的按字典序最小的字符串。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre><strong>输入：</strong>s = "dcab", pairs = [[0,3],[1,2]]\n<strong>输出：</strong>"bacd"\n<strong>解释：</strong> \n交换 s[0] 和 s[3], s = "bcad"\n交换 s[1] 和 s[2], s = "bacd"\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>s = "dcab", pairs = [[0,3],[1,2],[0,2]]\n<strong>输出：</strong>"abcd"\n<strong>解释：</strong>\n交换 s[0] 和 s[3], s = "bcad"\n交换 s[0] 和 s[2], s = "acbd"\n交换 s[1] 和 s[2], s = "abcd"</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>s = "cba", pairs = [[0,1],[1,2]]\n<strong>输出：</strong>"abc"\n<strong>解释：</strong>\n交换 s[0] 和 s[1], s = "bca"\n交换 s[1] 和 s[2], s = "bac"\n交换 s[0] 和 s[1], s = "abc"\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 10^5</code></li>\n\t<li><code>0 <= pairs.length <= 10^5</code></li>\n\t<li><code>0 <= pairs[i][0], pairs[i][1] < s.length</code></li>\n\t<li><code>s</code> 中只含有小写英文字母</li>\n</ul>\n",
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"code": "# @param {String} s\n# @param {Integer[][]} pairs\n# @return {String}\ndef smallest_string_with_swaps(s, pairs)\n\nend",
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"code": "-spec smallest_string_with_swaps(S :: unicode:unicode_binary(), Pairs :: [[integer()]]) -> unicode:unicode_binary().\nsmallest_string_with_swaps(S, Pairs) ->\n .",
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"hints": [
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"Think of it as a graph problem.",
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"Consider the pairs as connected nodes in the graph, what can you do with a connected component of indices ?",
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"We can sort each connected component alone to get the lexicographically minimum string."
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