James Pan

原题网址：https://leetcode.com/problems/two-sum-iii-data-structure-design/Design and implement a TwoSum class. It should support the following operations: add and find.add - Add the number to an

原题网址：https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific tar

原题网址：https://leetcode.com/problems/find-k-pairs-with-smallest-sums/You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k.Define a pair (u,v) which consists

原题网址：https://leetcode.com/problems/4sum-ii/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