James Pan

原题网址：https://leetcode.com/problems/android-unlock-patterns/ Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the An

原题网址：https://leetcode.com/problems/arithmetic-slices-ii-subsequence/ A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two con

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

原题网址：http://www.lintcode.com/en/problem/backpack/ Given n items with size Ai, an integer m denotes the size of a backpack. How full you can fill this backpack?  Notice You can not divid

原题网址：https://leetcode.com/problems/decode-ways/ A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an enco

原题网址：https://leetcode.com/problems/unique-binary-search-trees/ Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given n = 3, there are a

原题网址：https://leetcode.com/problems/climbing-stairs/ You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways

原题网址：https://leetcode.com/problems/unique-paths/ A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right a

原题网址：https://leetcode.com/problems/decode-ways/ A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an enco

原题网址：https://leetcode.com/problems/ones-and-zeroes/ In the computer world, use restricted resource you have to generate maximum benefit is what we always want to pursue. For now, suppose you a