Largest Divisible Subset
Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of ...
House Robber III
The thief has found himself a new place for his thievery again. There is only one entrance to this a...
Unique Binary Search Trees
Given n, how many structurally unique BST’s (binary search trees) that store values 1 …...
Unique Binary Search Trees II
Given an integer n, generate all structurally unique BST’s (binary search trees) that store va...
Increasing Triplet Subsequence
这题挺有意思，主要是要找出是否有3个元素递增，这3个元素的索引必须依次增加但是不要求临近。首先贴题目： Given an unsorted array return whether an increa...
Wiggle Sort II
这题的follow up实在太难，没想出来，就贴一个简单的做法。首先先贴一下题目： Given an unsorted array nums , reorder it such that nums[0...
Longest Increasing Subsequence
这题我做的时候用了动态规划，但是也只是能满足时间复杂度小于O(N2)，先看下题目 Given an unsorted array of integers, find the length of lon...
Bulls and Cows
You are playing the following Bulls and Cows game with your friend: You write down a number and ask ...
Single Number III
又是一道single number题目，这类题目一般都是依赖位操作，先给出题目： Given an array of numbers nums , in which exactly two eleme...
Different Ways to Add Parentheses
一道初看上去有点儿难度的题目，其实想明白了也不算太难。首先上题目： Given a string of numbers and operators, return all possible resul...