mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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158 lines
21 KiB
JSON
158 lines
21 KiB
JSON
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"title": "String Compression",
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"content": "<p>Given an array of characters <code>chars</code>, compress it using the following algorithm:</p>\n\n<p>Begin with an empty string <code>s</code>. For each group of <strong>consecutive repeating characters</strong> in <code>chars</code>:</p>\n\n<ul>\n\t<li>If the group's length is <code>1</code>, append the character to <code>s</code>.</li>\n\t<li>Otherwise, append the character followed by the group's length.</li>\n</ul>\n\n<p>The compressed string <code>s</code> <strong>should not be returned separately</strong>, but instead, be stored <strong>in the input character array <code>chars</code></strong>. Note that group lengths that are <code>10</code> or longer will be split into multiple characters in <code>chars</code>.</p>\n\n<p>After you are done <strong>modifying the input array,</strong> return <em>the new length of the array</em>.</p>\n\n<p>You must write an algorithm that uses only constant extra space.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a","a","b","b","c","c","c"]\n<strong>Output:</strong> Return 6, and the first 6 characters of the input array should be: ["a","2","b","2","c","3"]\n<strong>Explanation:</strong> The groups are "aa", "bb", and "ccc". This compresses to "a2b2c3".\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a"]\n<strong>Output:</strong> Return 1, and the first character of the input array should be: ["a"]\n<strong>Explanation:</strong> The only group is "a", which remains uncompressed since it's a single character.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a","b","b","b","b","b","b","b","b","b","b","b","b"]\n<strong>Output:</strong> Return 4, and the first 4 characters of the input array should be: ["a","b","1","2"].\n<strong>Explanation:</strong> The groups are "a" and "bbbbbbbbbbbb". This compresses to "ab12".</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= chars.length <= 2000</code></li>\n\t<li><code>chars[i]</code> is a lowercase English letter, uppercase English letter, digit, or symbol.</li>\n</ul>\n",
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"translatedTitle": "压缩字符串",
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"translatedContent": "<p>给你一个字符数组 <code>chars</code> ，请使用下述算法压缩：</p>\n\n<p>从一个空字符串 <code>s</code> 开始。对于 <code>chars</code> 中的每组 <strong>连续重复字符</strong> ：</p>\n\n<ul>\n\t<li>如果这一组长度为 <code>1</code> ，则将字符追加到 <code>s</code> 中。</li>\n\t<li>否则，需要向 <code>s</code> 追加字符，后跟这一组的长度。</li>\n</ul>\n\n<p>压缩后得到的字符串 <code>s</code> <strong>不应该直接返回</strong> ，需要转储到字符数组 <code>chars</code> 中。需要注意的是，如果组长度为 <code>10</code> 或 <code>10</code> 以上，则在 <code>chars</code> 数组中会被拆分为多个字符。</p>\n\n<p>请在 <strong>修改完输入数组后</strong> ，返回该数组的新长度。</p>\n\n<p>你必须设计并实现一个只使用常量额外空间的算法来解决此问题。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>chars = [\"a\",\"a\",\"b\",\"b\",\"c\",\"c\",\"c\"]\n<strong>输出：</strong>返回 6 ，输入数组的前 6 个字符应该是：[\"a\",\"2\",\"b\",\"2\",\"c\",\"3\"]\n<strong>解释：</strong>\"aa\" 被 \"a2\" 替代。\"bb\" 被 \"b2\" 替代。\"ccc\" 被 \"c3\" 替代。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>chars = [\"a\"]\n<strong>输出：</strong>返回 1 ，输入数组的前 1 个字符应该是：[\"a\"]\n<strong>解释：</strong>唯一的组是“a”，它保持未压缩，因为它是一个字符。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>chars = [\"a\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\"]\n<strong>输出：</strong>返回 4 ，输入数组的前 4 个字符应该是：[\"a\",\"b\",\"1\",\"2\"]。\n<strong>解释：</strong>由于字符 \"a\" 不重复，所以不会被压缩。\"bbbbbbbbbbbb\" 被 “b12” 替代。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= chars.length <= 2000</code></li>\n\t<li><code>chars[i]</code> 可以是小写英文字母、大写英文字母、数字或符号</li>\n</ul>\n",
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