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309. 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 find the maximum profit. You may

Leetcode 3--Add Two Numbers Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the length is 3

LeetCode 13 -- Roman to Integer Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999 Subscribe to see which companies asked this question

LeetCode -- 63 Unique Paths II Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space is marked as 1

LeetCode -- 62 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 at any point in time.

LeetCode 38 -- Count and Say The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1" or 11. 11 is read off as