mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
17 KiB
JSON
186 lines
17 KiB
JSON
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"questionId": "2123",
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"title": "The Number of Weak Characters in the Game",
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"content": "<p>You are playing a game that contains multiple characters, and each of the characters has <strong>two</strong> main properties: <strong>attack</strong> and <strong>defense</strong>. You are given a 2D integer array <code>properties</code> where <code>properties[i] = [attack<sub>i</sub>, defense<sub>i</sub>]</code> represents the properties of the <code>i<sup>th</sup></code> character in the game.</p>\n\n<p>A character is said to be <strong>weak</strong> if any other character has <strong>both</strong> attack and defense levels <strong>strictly greater</strong> than this character's attack and defense levels. More formally, a character <code>i</code> is said to be <strong>weak</strong> if there exists another character <code>j</code> where <code>attack<sub>j</sub> > attack<sub>i</sub></code> and <code>defense<sub>j</sub> > defense<sub>i</sub></code>.</p>\n\n<p>Return <em>the number of <strong>weak</strong> characters</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> properties = [[5,5],[6,3],[3,6]]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> No character has strictly greater attack and defense than the other.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> properties = [[2,2],[3,3]]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The first character is weak because the second character has a strictly greater attack and defense.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> properties = [[1,5],[10,4],[4,3]]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The third character is weak because the second character has a strictly greater attack and defense.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= properties.length <= 10<sup>5</sup></code></li>\n\t<li><code>properties[i].length == 2</code></li>\n\t<li><code>1 <= attack<sub>i</sub>, defense<sub>i</sub> <= 10<sup>5</sup></code></li>\n</ul>\n",
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"exampleTestcases": "[[5,5],[6,3],[3,6]]\n[[2,2],[3,3]]\n[[1,5],[10,4],[4,3]]",
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"categoryTitle": "Algorithms",
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"code": "(define/contract (number-of-weak-characters properties)\n (-> (listof (listof exact-integer?)) exact-integer?)\n\n )",
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"hints": [
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"Sort the array on the basis of the attack values and group characters with the same attack together. How can you use these groups?",
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"Characters in one group will always have a lesser attack value than the characters of the next group. Hence, we will only need to check if there is a higher defense value present in the next groups."
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],
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