Surrounded Regions
Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.
#递归和动态规划
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Towers of Hanoi
In the classic problem of the Towers of Hanoi, you have 3 towers and N disks of different sizes which can slid
Trap Water
You are given an array of n non-negative integers. Each value means the height of a histogram.
Unique Path
How many paths are there for a robot to go from (0,0) to (x,y), supposing it can only move down and move right
Word Break II
Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a
Word Break
Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequen