题目链接 https://leetcode.com/problems/4sum/?tab=Description
找到数组中满足 a+b+c+d=0的所有组合,要求不重复。
Basic idea is using subfunctions for 3sum and 2sum, and keeping throwing all impo...
Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k.
Example 1:
Input:nums = [1,1,1], k = 2
Output: 2
Note:
The l...