mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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187 lines
18 KiB
JSON
187 lines
18 KiB
JSON
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"title": "Vowels Game in a String",
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"content": "<p>Alice and Bob are playing a game on a string.</p>\n\n<p>You are given a string <code>s</code>, Alice and Bob will take turns playing the following game where Alice starts <strong>first</strong>:</p>\n\n<ul>\n\t<li>On Alice's turn, she has to remove any <strong>non-empty</strong> <span data-keyword=\"substring\">substring</span> from <code>s</code> that contains an <strong>odd</strong> number of vowels.</li>\n\t<li>On Bob's turn, he has to remove any <strong>non-empty</strong> <span data-keyword=\"substring\">substring</span> from <code>s</code> that contains an <strong>even</strong> number of vowels.</li>\n</ul>\n\n<p>The first player who cannot make a move on their turn loses the game. We assume that both Alice and Bob play <strong>optimally</strong>.</p>\n\n<p>Return <code>true</code> if Alice wins the game, and <code>false</code> otherwise.</p>\n\n<p>The English vowels are: <code>a</code>, <code>e</code>, <code>i</code>, <code>o</code>, and <code>u</code>.</p>\n\n<p> </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\">s = "leetcoder"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">true</span></p>\n\n<p><strong>Explanation:</strong><br />\nAlice can win the game as follows:</p>\n\n<ul>\n\t<li>Alice plays first, she can delete the underlined substring in <code>s = "<u><strong>leetco</strong></u>der"</code> which contains 3 vowels. The resulting string is <code>s = "der"</code>.</li>\n\t<li>Bob plays second, he can delete the underlined substring in <code>s = "<u><strong>d</strong></u>er"</code> which contains 0 vowels. The resulting string is <code>s = "er"</code>.</li>\n\t<li>Alice plays third, she can delete the whole string <code>s = "<strong><u>er</u></strong>"</code> which contains 1 vowel.</li>\n\t<li>Bob plays fourth, since the string is empty, there is no valid play for Bob. So Alice wins the game.</li>\n</ul>\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\">s = "bbcd"</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">false</span></p>\n\n<p><strong>Explanation:</strong><br />\nThere is no valid play for Alice in her first turn, so Alice loses the game.</p>\n</div>\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</code> consists only of lowercase English letters.</li>\n</ul>\n",
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"hints": [
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"If there are no vowels in the initial string, then Bob wins.",
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"If the number of vowels in the initial string is odd, then Alice can remove the whole string on her first turn and win.",
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"What if the number of vowels in the initial string is even? What’s the optimal play for Alice’s first turn?"
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