摘要： Given n items with size Ai, an integer m denotes the size of a backpack. How full you can fill this backpack? If we have 4 items with size [2, 3, 5, 7 阅读全文

摘要： Given n distinct positive integers, integer k (k <= n) and a number target. Find k numbers where sum is target. Calculate how many solutions there are 阅读全文

摘要： Given n items with size Ai and value Vi, and a backpack with size m. What's the maximum value can you put into the backpack? Given 4 items with size [ 阅读全文

摘要： Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"], Return: 这题其实是算是Valid Anagram的一个fol 阅读全文

摘要： Given two strings s and t, write a function to determine if t is an anagram of s. For example,s = "anagram", t = "nagaram", return true.s = "rat", t = 阅读全文

摘要： Alice presented her friend Bob with an array of N positive integers, indexed from 1 to N. She challenged Bob with many queries of the form "what is th 阅读全文

摘要： Give you an integer matrix (with row size n, column size m)，find the longest increasing continuous subsequence in this matrix. (The definition of the 阅读全文

摘要： Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representati 阅读全文

摘要： Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all the balloon 阅读全文

摘要： There are n coins in a line. Two players take turns to take a coin from one of the ends of the line until there are no more coins left. The player wit 阅读全文