James Pan

原题网址：https://leetcode.com/problems/add-digits/Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.For example:Given num = 38, the proces

原题网址：https://leetcode.com/problems/find-the-duplicate-number/Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate nu

原题网址：https://leetcode.com/problems/linked-list-cycle-ii/Given a linked list, return the node where the cycle begins. If there is no cycle, return null.Note: Do not modify the linked list.

原题网址：https://leetcode.com/problems/linked-list-cycle/Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?方法：使用两个指针。/** * Defini

原题网址：https://leetcode.com/problems/rotate-array/Rotate an array of n elements to the right by k steps.For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,

原题网址：https://leetcode.com/problems/permutations-ii/Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2] have the followi

原题网址：https://leetcode.com/problems/rotate-list/Given a list, rotate the list to the right by k places, where k is non-negative.For example:Given 1->2->3->4->5->NULL and k = 2,return 4-

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/rotate-function/Given an array of integers A and let n to be its length.Assume Bk to be an array obtained by rotating the array A k positions clock-wise,