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            "categoryTitle": "Algorithms",
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            "title": "Remove Invalid Parentheses",
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            "content": "<p>Given a string <code>s</code> that contains parentheses and letters, remove the minimum number of invalid parentheses to make the input string valid.</p>\n\n<p>Return <em>a list of <strong>unique strings</strong> that are valid with the minimum number of removals</em>. You may return the answer in <strong>any order</strong>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;()())()&quot;\n<strong>Output:</strong> [&quot;(())()&quot;,&quot;()()()&quot;]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;(a)())()&quot;\n<strong>Output:</strong> [&quot;(a())()&quot;,&quot;(a)()()&quot;]\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;)(&quot;\n<strong>Output:</strong> [&quot;&quot;]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 25</code></li>\n\t<li><code>s</code> consists of lowercase English letters and parentheses <code>&#39;(&#39;</code> and <code>&#39;)&#39;</code>.</li>\n\t<li>There will be at most <code>20</code> parentheses in <code>s</code>.</li>\n</ul>\n",
            "translatedTitle": "删除无效的括号",
            "translatedContent": "<p>给你一个由若干括号和字母组成的字符串 <code>s</code> ，删除最小数量的无效括号，使得输入的字符串有效。</p>\n\n<p>返回所有可能的结果。答案可以按 <strong>任意顺序</strong> 返回。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"()())()\"\n<strong>输出：</strong>[\"(())()\",\"()()()\"]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"(a)())()\"\n<strong>输出：</strong>[\"(a())()\",\"(a)()()\"]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \")(\"\n<strong>输出：</strong>[\"\"]\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 25</code></li>\n\t<li><code>s</code> 由小写英文字母以及括号 <code>'('</code> 和 <code>')'</code> 组成</li>\n\t<li><code>s</code> 中至多含 <code>20</code> 个括号</li>\n</ul>\n",
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                    "code": "-spec remove_invalid_parentheses(S :: unicode:unicode_binary()) -> [unicode:unicode_binary()].\nremove_invalid_parentheses(S) ->\n  .",
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            "hints": [
                "Since we do not know which brackets can be removed, we try all the options! We can use recursion.",
                "In the recursion, for each bracket, we can either use it or remove it.",
                "Recursion will generate all the valid parentheses strings but we want the ones with the least number of parentheses deleted.",
                "We can count the number of invalid brackets to be deleted and only generate the valid strings in the recusrion."
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