问题（Easy）： For a web developer, it is very important to know how to desig...

问题（Easy）： Given an m * n matrix M initialized with all 0's and several u...

问题（Easy）： Given a Binary Search Tree (BST), convert it to a Greater Tree...

问题（Easy）： We have two special characters. The first character can be rep...

问题（Easy）： Given a Binary Search Tree and a target number, return true if...

问题（Easy）： Given an array of integers where 1 ≤ a[i] ≤ n (n = size of arr...

问题（Easy）： Give a string s, count the number of non-empty (contiguous) su...

问题（Easy）： Given a word, you need to judge whether the usage of capitals ...

问题（Easy）： You are given a data structure of employee information, which ...

问题（Easy）： Given a non-empty 2D array grid of 0's and 1's, an island is a...