Package g0401_0500.s0454_4sum_ii

Class Solution

java.lang.Object

g0401_0500.s0454_4sum_ii.Solution

public class Solution
extends Object

454 - 4Sum II\. Medium Given four integer arrays `nums1`, `nums2`, `nums3`, and `nums4` all of length `n`, return the number of tuples `(i, j, k, l)` such that: * `0 <= i, j, k, l < n` * `nums1[i] + nums2[j] + nums3[k] + nums4[l] == 0` **Example 1:** **Input:** nums1 = [1,2], nums2 = [-2,-1], nums3 = [-1,2], nums4 = [0,2] **Output:** 2 **Explanation:** The two tuples are: 1. (0, 0, 0, 1) -> nums1[0] + nums2[0] + nums3[0] + nums4[1] = 1 + (-2) + (-1) + 2 = 0 2. (1, 1, 0, 0) -> nums1[1] + nums2[1] + nums3[0] + nums4[0] = 2 + (-1) + (-1) + 0 = 0 **Example 2:** **Input:** nums1 = [0], nums2 = [0], nums3 = [0], nums4 = [0] **Output:** 1 **Constraints:** * `n == nums1.length` * `n == nums2.length` * `n == nums3.length` * `n == nums4.length` * `1 <= n <= 200` * -228 <= nums1[i], nums2[i], nums3[i], nums4[i] <= 228

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	fourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

fourSumCount

public int fourSumCount(int[] nums1,
                        int[] nums2,
                        int[] nums3,
                        int[] nums4)