Same Tree

http://oj.leetcode.com/problems/same-tree/
Reverse Integer

http://oj.leetcode.com/problems/reverse-integer/
Best Time to Buy and Sell Stock II

http://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
Maximum Depth of Binary Tree

http://oj.leetcode.com/problems/maximum-depth-of-binary-tree/