mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
16 KiB
JSON
181 lines
16 KiB
JSON
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"questionId": "1371",
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"title": "Minimum Remove to Make Valid Parentheses",
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"content": "<p>Given a string <font face=\"monospace\">s</font> of <code>'('</code> , <code>')'</code> and lowercase English characters.</p>\n\n<p>Your task is to remove the minimum number of parentheses ( <code>'('</code> or <code>')'</code>, in any positions ) so that the resulting <em>parentheses string</em> is valid and return <strong>any</strong> valid string.</p>\n\n<p>Formally, a <em>parentheses string</em> is valid if and only if:</p>\n\n<ul>\n\t<li>It is the empty string, contains only lowercase characters, or</li>\n\t<li>It can be written as <code>AB</code> (<code>A</code> concatenated with <code>B</code>), where <code>A</code> and <code>B</code> are valid strings, or</li>\n\t<li>It can be written as <code>(A)</code>, where <code>A</code> is a valid string.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "lee(t(c)o)de)"\n<strong>Output:</strong> "lee(t(c)o)de"\n<strong>Explanation:</strong> "lee(t(co)de)" , "lee(t(c)ode)" would also be accepted.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "a)b(c)d"\n<strong>Output:</strong> "ab(c)d"\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<strong>Explanation:</strong> An empty string is also valid.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 10<sup>5</sup></code></li>\n\t<li><code>s[i]</code> is either<code>'('</code> , <code>')'</code>, or lowercase English letter<code>.</code></li>\n</ul>\n",
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"exampleTestcases": "\"lee(t(c)o)de)\"\n\"a)b(c)d\"\n\"))((\"",
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"code": "-spec min_remove_to_make_valid(S :: unicode:unicode_binary()) -> unicode:unicode_binary().\nmin_remove_to_make_valid(S) ->\n .",
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"hints": [
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"Each prefix of a balanced parentheses has a number of open parentheses greater or equal than closed parentheses, similar idea with each suffix.",
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"Check the array from left to right, remove characters that do not meet the property mentioned above, same idea in backward way."
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],
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