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

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            "title": "Generate Binary Strings Without Adjacent Zeros",
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            "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",
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                    "code": "class Solution(object):\n    def validStrings(self, n):\n        \"\"\"\n        :type n: int\n        :rtype: List[str]\n        \"\"\"\n        ",
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                    "code": "func validStrings(n int) []string {\n    \n}",
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                    "code": "# @param {Integer} n\n# @return {String[]}\ndef valid_strings(n)\n    \nend",
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            "hints": [
                "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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