Understanding

　　首先，这是一个回归问题，同时也是一个时间序列的问题。 [Read More]

Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water. [Read More]

Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. [Read More]

Given a 2D board containing ‘X’ and ‘O’ (the letter O), capture all regions surrounded by ‘X’. [Read More]

Description [Read More]

Description [Read More]