James Pan

原题网址：https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/Given a string, find the length of the longest substring T that contains at most 2 distinct characters.

原题网址：https://leetcode.com/problems/wiggle-sort-ii/Given an unsorted array nums, reorder it such that nums[0] nums[2] .Example:(1) Given nums = [1, 5, 1, 1, 6, 4], one possible answer is

原题网址：https://leetcode.com/problems/contains-duplicate-iii/Given an array of integers, find out whether there are two distinct indices i and j in the array such that the difference between nums[i] 

一个长度为n的数组，从中选取k个数字，若定义这k个数字的半径为排序后相邻两个数字之间的最小间隔，则k个数字所能达到的最大半径是多少？如果k = 1，则半径为无穷大。假设k > 0。方法一：深度优先搜索。class SolutionDFS { private int max = 0; public SolutionDFS(int[] nums, int k) { find(n

原题网址：https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to

原题网址：https://leetcode.com/problems/paint-house/There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a cer

原题网址：https://leetcode.com/problems/maximum-gap/Given an unsorted array, find the maximum difference between the successive elements in its sorted form.Try to solve it in linear time/space.

原题网址:https://leetcode.com/problems/rearrange-string-k-distance-apart/Given a non-empty string str and an integer k, rearrange the string such that the same characters are at least distance k fro

原题网址：https://leetcode.com/problems/paint-fence/There is a fence with n posts, each post can be painted with one of the k colors.You have to paint all the posts such that no more than two adj