## 447. Number of Boomerangs

###### 447. Number of Boomerangs

Problem Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k

## 454. 4Sum II

###### 454. 4Sum II

Problem Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have sam

## 1. Two Sum

###### 1. Two Sum

Problem Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use t

## 350. Intersection of Two Arrays II

###### 350. Intersection of Two Arrays II

Problem Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Out