0018.4sum

README

Given an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d]] such that:

0 <= a, b, c, d < n a, b, c, and d are distinct. nums[a] + nums[b] + nums[c] + nums[d] == target You may return the answer in any order.

Example 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:

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

Constraints:

1 <= nums.length <= 200 -10^9 <= nums[i] <= 10^9 -10^9 <= target <= 10^9