leetcode-problemset/leetcode-cn/originData/generate-binary-strings-without-adjacent-zeros.json

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        "question": {
            "questionId": "3453",
            "questionFrontendId": "3211",
            "categoryTitle": "Algorithms",
            "boundTopicId": 2832455,
            "title": "Generate Binary Strings Without Adjacent Zeros",
            "titleSlug": "generate-binary-strings-without-adjacent-zeros",
            "content": "<p>You are given a positive integer <code>n</code>.</p>\n\n<p>A binary string <code>x</code> is <strong>valid</strong> if all <span data-keyword=\"substring-nonempty\">substrings</span> of <code>x</code> of length 2 contain <strong>at least</strong> one <code>&quot;1&quot;</code>.</p>\n\n<p>Return all <strong>valid</strong> strings with length <code>n</code><strong>, </strong>in <em>any</em> order.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 3</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">[&quot;010&quot;,&quot;011&quot;,&quot;101&quot;,&quot;110&quot;,&quot;111&quot;]</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The valid strings of length 3 are: <code>&quot;010&quot;</code>, <code>&quot;011&quot;</code>, <code>&quot;101&quot;</code>, <code>&quot;110&quot;</code>, and <code>&quot;111&quot;</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 1</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">[&quot;0&quot;,&quot;1&quot;]</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The valid strings of length 1 are: <code>&quot;0&quot;</code> and <code>&quot;1&quot;</code>.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 18</code></li>\n</ul>\n",
            "translatedTitle": "生成不含相邻零的二进制字符串",
            "translatedContent": "<p>给你一个正整数 <code>n</code>。</p>\n\n<p>如果一个二进制字符串 <code>x</code> 的所有长度为 2 的<span data-keyword=\"substring-nonempty\">子字符串</span>中包含 <strong>至少</strong> 一个 <code>\"1\"</code>，则称 <code>x</code> 是一个<strong> 有效</strong> 字符串。</p>\n\n<p>返回所有长度为 <code>n</code> 的<strong> 有效</strong> 字符串，可以以任意顺序排列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">n = 3</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">[\"010\",\"011\",\"101\",\"110\",\"111\"]</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>长度为 3 的有效字符串有：<code>\"010\"</code>、<code>\"011\"</code>、<code>\"101\"</code>、<code>\"110\"</code> 和 <code>\"111\"</code>。</p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">n = 1</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">[\"0\",\"1\"]</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>长度为 1 的有效字符串有：<code>\"0\"</code> 和 <code>\"1\"</code>。</p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 18</code></li>\n</ul>\n",
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                "If we have a string <code>s</code> of length <code>x</code>, we can generate all strings of length <code>x + 1</code>.",
                "If <code>s</code> has 0 as the last character, we can only append 1, whereas if the last character is 1, we can append both 0 and 1.",
                "We can use recursion and backtracking to generate all such strings."
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