mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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189 lines
17 KiB
JSON
189 lines
17 KiB
JSON
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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> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "()())()"\n<strong>Output:</strong> ["(())()","()()()"]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "(a)())()"\n<strong>Output:</strong> ["(a())()","(a)()()"]\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = ")("\n<strong>Output:</strong> [""]\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 25</code></li>\n\t<li><code>s</code> consists of lowercase English letters and parentheses <code>'('</code> and <code>')'</code>.</li>\n\t<li>There will be at most <code>20</code> parentheses in <code>s</code>.</li>\n</ul>\n",
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"code": "(define/contract (remove-invalid-parentheses s)\n (-> string? (listof string?))\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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"code": "defmodule Solution do\n @spec remove_invalid_parentheses(s :: String.t) :: [String.t]\n def remove_invalid_parentheses(s) do\n \n end\nend",
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"hints": [
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"Since we do not know which brackets can be removed, we try all the options! We can use recursion.",
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"In the recursion, for each bracket, we can either use it or remove it.",
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"Recursion will generate all the valid parentheses strings but we want the ones with the least number of parentheses deleted.",
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"We can count the number of invalid brackets to be deleted and only generate the valid strings in the recusrion."
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],
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