Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm shou...

Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. Note: Yo...

Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at mo...

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as ma...

Follow up for "Find Minimum in Rotated Sorted Array": What if duplicates are allowed? Would this a

Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 求阶乘的后缀0个数 乘法中的零来源于10，10来源于2和5，......

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at mo...

Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) ti

Given an unsorted array of integers, find the length of longest increasing subsequence. For example, Given [10, 9, 2, 5, 3, 7, 101, 18], The longest increas...