mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
17 KiB
JSON
182 lines
17 KiB
JSON
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"questionId": "2245",
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"questionFrontendId": "2126",
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"title": "Destroying Asteroids",
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"content": "<p>You are given an integer <code>mass</code>, which represents the original mass of a planet. You are further given an integer array <code>asteroids</code>, where <code>asteroids[i]</code> is the mass of the <code>i<sup>th</sup></code> asteroid.</p>\n\n<p>You can arrange for the planet to collide with the asteroids in <strong>any arbitrary order</strong>. If the mass of the planet is <b>greater than or equal to</b> the mass of the asteroid, the asteroid is <strong>destroyed</strong> and the planet <strong>gains</strong> the mass of the asteroid. Otherwise, the planet is destroyed.</p>\n\n<p>Return <code>true</code><em> if <strong>all</strong> asteroids can be destroyed. Otherwise, return </em><code>false</code><em>.</em></p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> mass = 10, asteroids = [3,9,19,5,21]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> One way to order the asteroids is [9,19,5,3,21]:\n- The planet collides with the asteroid with a mass of 9. New planet mass: 10 + 9 = 19\n- The planet collides with the asteroid with a mass of 19. New planet mass: 19 + 19 = 38\n- The planet collides with the asteroid with a mass of 5. New planet mass: 38 + 5 = 43\n- The planet collides with the asteroid with a mass of 3. New planet mass: 43 + 3 = 46\n- The planet collides with the asteroid with a mass of 21. New planet mass: 46 + 21 = 67\nAll asteroids are destroyed.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> mass = 5, asteroids = [4,9,23,4]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> \nThe planet cannot ever gain enough mass to destroy the asteroid with a mass of 23.\nAfter the planet destroys the other asteroids, it will have a mass of 5 + 4 + 9 + 4 = 22.\nThis is less than 23, so a collision would not destroy the last asteroid.</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= mass <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= asteroids.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= asteroids[i] <= 10<sup>5</sup></code></li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "10\n[3,9,19,5,21]\n5\n[4,9,23,4]",
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"categoryTitle": "Algorithms",
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"code": "class Solution(object):\n def asteroidsDestroyed(self, mass, asteroids):\n \"\"\"\n :type mass: int\n :type asteroids: List[int]\n :rtype: bool\n \"\"\"\n ",
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"code": "# @param {Integer} mass\n# @param {Integer[]} asteroids\n# @return {Boolean}\ndef asteroids_destroyed(mass, asteroids)\n \nend",
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"code": "object Solution {\n def asteroidsDestroyed(mass: Int, asteroids: Array[Int]): Boolean = {\n \n }\n}",
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"code": "impl Solution {\n pub fn asteroids_destroyed(mass: i32, asteroids: Vec<i32>) -> bool {\n \n }\n}",
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"code": "(define/contract (asteroids-destroyed mass asteroids)\n (-> exact-integer? (listof exact-integer?) boolean?)\n )",
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"code": "-spec asteroids_destroyed(Mass :: integer(), Asteroids :: [integer()]) -> boolean().\nasteroids_destroyed(Mass, Asteroids) ->\n .",
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"code": "defmodule Solution do\n @spec asteroids_destroyed(mass :: integer, asteroids :: [integer]) :: boolean\n def asteroids_destroyed(mass, asteroids) do\n \n end\nend",
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"hints": [
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"Choosing the asteroid to collide with can be done greedily.",
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"If an asteroid will destroy the planet, then every bigger asteroid will also destroy the planet.",
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"You only need to check the smallest asteroid at each collision. If it will destroy the planet, then every other asteroid will also destroy the planet.",
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"Sort the asteroids in non-decreasing order by mass, then greedily try to collide with the asteroids in that order."
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],
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"sampleTestCase": "10\n[3,9,19,5,21]",
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