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g0001_0100.s0018_four_sum.readme.md Maven / Gradle / Ivy

18\. 4Sum

Medium

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`
*   -109 <= nums[i] <= 109
*   -109 <= target <= 109