Computer science note/LeetCode

4Sum - LeetCode

problem description and solution for the 4Sum problem on LeetCode.

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iven an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d]] such that:
给定一个 n 整数数组,返回一个包含所有唯一四胞胎 [nums[a], nums[b], nums[c], nums[d]] 的数组 nums ,使得:

  • 0 <= a, b, c, d < n
  • abc, and d are distinct.
    a 、 b c 和 d 是不同的。
  • nums[a] + nums[b] + nums[c] + nums[d] == target

You may return the answer in any order.
您可以按任何顺序返回答案。

Example 1: 示例 1:

Input: nums = [1,0,-1,0,-2,2], target = 0 Output: [[-2,-1,1,2],[-2,0,0,2],[-1,0,0,1]]

Example 2: 示例 2:

Input: nums = [2,2,2,2,2], target = 8 Output: [[2,2,2,2]]

Constraints: 约束:

  • 1 <= nums.length <= 200
  • -109 <= nums[i] <= 109
  • -109 <= target <= 109