Given an array nums
of n integers and an integer target
, are there elements a, b, c, and d in nums
such that a + b + c + d = target
? Find all unique quadruplets in the array which gives the sum of target
.
Notice that the solution set must not contain duplicate quadruplets.
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 = [], target = 0
Output: []
Constraints:
0 <= nums.length <= 200
-109 <= nums[i] <= 109
-109 <= target <= 109