Can you solve this real interview question? 4Sum - 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, …

Can you solve this real interview question? 4Sum II - 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 …

Count the number of pairs with concatenation equals to target.

Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j ...

Jan 13, 2022 · https://leetcode.com/problems/4sum/ https://leetcode.com/problems/number-of-subsequences-that-satisfy-the-given-sum-condition/ https://leetcode.com/problems/two-sum-iv-input …