摘要：
On a broken keyboard, some of the keys are always stucked. So when you type some sentences, the characters corresponding to those keys will appear rep 阅读全文
摘要：
Input our current position and a destination, an online map can recommend several paths. Now your job is to recommend two paths to your user: one is t 阅读全文
摘要：
Given a tree, you are supposed to tell if it is a complete binary tree. Input Specification: Each input file contains one test case. For each case, th 阅读全文
摘要：
Formation is very important when taking a group photo. Given the rules of forming K rows with N people as the following: The number of people in each 阅读全文