lqybzx的专栏

Problem Description An abandoned country has n(n≤100000) villages which are numbered from 1 to n. Since abandoned for a long time, the roads need to be re-built. There are m(m≤1000000) roads

F. Drivers Dissatisfaction time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output In one kingdom there are n citie