mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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205 lines
17 KiB
JSON
205 lines
17 KiB
JSON
{
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"question": {
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"questionId": "493",
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"title": "Reverse Pairs",
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"content": "<p>Given an integer array <code>nums</code>, return <em>the number of <strong>reverse pairs</strong> in the array</em>.</p>\n\n<p>A <strong>reverse pair</strong> is a pair <code>(i, j)</code> where:</p>\n\n<ul>\n\t<li><code>0 <= i < j < nums.length</code> and</li>\n\t<li><code>nums[i] > 2 * nums[j]</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,3,2,3,1]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The reverse pairs are:\n(1, 4) --> nums[1] = 3, nums[4] = 1, 3 > 2 * 1\n(3, 4) --> nums[3] = 3, nums[4] = 1, 3 > 2 * 1\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,4,3,5,1]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The reverse pairs are:\n(1, 4) --> nums[1] = 4, nums[4] = 1, 4 > 2 * 1\n(2, 4) --> nums[2] = 3, nums[4] = 1, 3 > 2 * 1\n(3, 4) --> nums[3] = 5, nums[4] = 1, 5 > 2 * 1\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>-2<sup>31</sup> <= nums[i] <= 2<sup>31</sup> - 1</code></li>\n</ul>\n",
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"translatedTitle": null,
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"isPaidOnly": false,
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"difficulty": "Hard",
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"likes": 5771,
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"similarQuestions": "[{\"title\": \"Count of Smaller Numbers After Self\", \"titleSlug\": \"count-of-smaller-numbers-after-self\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Count of Range Sum\", \"titleSlug\": \"count-of-range-sum\", \"difficulty\": \"Hard\", \"translatedTitle\": null}]",
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"exampleTestcases": "[1,3,2,3,1]\n[2,4,3,5,1]",
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"categoryTitle": "Algorithms",
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"topicTags": [
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"name": "Array",
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"slug": "array",
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"name": "Binary Search",
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"name": "Divide and Conquer",
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"name": "Binary Indexed Tree",
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},
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"name": "Segment Tree",
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"name": "Merge Sort",
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},
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"name": "Ordered Set",
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"lang": "C++",
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"code": "class Solution {\npublic:\n int reversePairs(vector<int>& nums) {\n \n }\n};",
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"lang": "Python",
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"code": "class Solution(object):\n def reversePairs(self, nums):\n \"\"\"\n :type nums: List[int]\n :rtype: int\n \"\"\"\n ",
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"lang": "TypeScript",
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"code": "class Solution {\n\n /**\n * @param Integer[] $nums\n * @return Integer\n */\n function reversePairs($nums) {\n \n }\n}",
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"lang": "Kotlin",
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"code": "class Solution {\n fun reversePairs(nums: IntArray): Int {\n \n }\n}",
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"lang": "Dart",
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"code": "class Solution {\n int reversePairs(List<int> nums) {\n \n }\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func reversePairs(nums []int) int {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {Integer[]} nums\n# @return {Integer}\ndef reverse_pairs(nums)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def reversePairs(nums: Array[Int]): Int = {\n \n }\n}",
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn reverse_pairs(nums: Vec<i32>) -> i32 {\n \n }\n}",
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"langSlug": "racket",
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"code": "(define/contract (reverse-pairs nums)\n (-> (listof exact-integer?) exact-integer?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec reverse_pairs(Nums :: [integer()]) -> integer().\nreverse_pairs(Nums) ->\n .",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec reverse_pairs(nums :: [integer]) :: integer\n def reverse_pairs(nums) do\n \n end\nend",
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"hints": [
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"Use the merge-sort technique.",
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"Divide the array into two parts and sort them.",
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"For each integer in the first part, count the number of integers that satisfy the condition from the second part. Use the pointer to help you in the counting process."
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],
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"sampleTestCase": "[1,3,2,3,1]",
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