摘要： Math MagicTime Limit: 3 Seconds Memory Limit: 32768 KBYesterday, my teacher taught us about math: +, -, *, /, GCD, LCM... As you know, LCM (Least common multiple) of two positive numbers can be solved easily because of a * b = GCD (a, b) * LCM (a, b).In class, I raised a new idea: "how to calcu 阅读全文

摘要： Conquer a New RegionTime Limit: 5 Seconds Memory Limit: 32768 KBThe wheel of the history rolling forward, our king conquered a new region in a distant continent.There are N towns (numbered from 1 to N) in this region connected by several roads. It's confirmed that there is exact one route betwee 阅读全文