Buy Tickets Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 19725 Accepted: 9756 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue- The Lunar New Year wa
Level: Easy 题目描述: Given two non-empty binary trees s and t, check whether tree t has exactly the same structure and node values with a subtree of s. A subtree of s is a tree consists of a node in s and all of this node's descendants. The tree s cou