mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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194 lines
18 KiB
JSON
194 lines
18 KiB
JSON
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"title": "Number of Valid Words for Each Puzzle",
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"content": "With respect to a given <code>puzzle</code> string, a <code>word</code> is <em>valid</em> if both the following conditions are satisfied:\n<ul>\n\t<li><code>word</code> contains the first letter of <code>puzzle</code>.</li>\n\t<li>For each letter in <code>word</code>, that letter is in <code>puzzle</code>.\n\t<ul>\n\t\t<li>For example, if the puzzle is <code>"abcdefg"</code>, then valid words are <code>"faced"</code>, <code>"cabbage"</code>, and <code>"baggage"</code>, while</li>\n\t\t<li>invalid words are <code>"beefed"</code> (does not include <code>'a'</code>) and <code>"based"</code> (includes <code>'s'</code> which is not in the puzzle).</li>\n\t</ul>\n\t</li>\n</ul>\nReturn <em>an array </em><code>answer</code><em>, where </em><code>answer[i]</code><em> is the number of words in the given word list </em><code>words</code><em> that is valid with respect to the puzzle </em><code>puzzles[i]</code>.\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["aaaa","asas","able","ability","actt","actor","access"], puzzles = ["aboveyz","abrodyz","abslute","absoryz","actresz","gaswxyz"]\n<strong>Output:</strong> [1,1,3,2,4,0]\n<strong>Explanation:</strong> \n1 valid word for "aboveyz" : "aaaa" \n1 valid word for "abrodyz" : "aaaa"\n3 valid words for "abslute" : "aaaa", "asas", "able"\n2 valid words for "absoryz" : "aaaa", "asas"\n4 valid words for "actresz" : "aaaa", "asas", "actt", "access"\nThere are no valid words for "gaswxyz" cause none of the words in the list contains letter 'g'.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["apple","pleas","please"], puzzles = ["aelwxyz","aelpxyz","aelpsxy","saelpxy","xaelpsy"]\n<strong>Output:</strong> [0,1,3,2,0]\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= words.length <= 10<sup>5</sup></code></li>\n\t<li><code>4 <= words[i].length <= 50</code></li>\n\t<li><code>1 <= puzzles.length <= 10<sup>4</sup></code></li>\n\t<li><code>puzzles[i].length == 7</code></li>\n\t<li><code>words[i]</code> and <code>puzzles[i]</code> consist of lowercase English letters.</li>\n\t<li>Each <code>puzzles[i] </code>does not contain repeated characters.</li>\n</ul>\n",
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"Exploit the fact that the length of the puzzle is only 7.",
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"Use bit-masks to represent the word and puzzle strings.",
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"For each puzzle, count the number of words whose bit-mask is a sub-mask of the puzzle's bit-mask."
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