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Problem Description Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadline of handing in the homework. If Ignatius hands in t

A kingdom has n cities numbered 1 to n, and some bidirectional roads connecting cities. The capitalis always city 1.After a war, all the roads of the kingdom are destroyed. The king wants to rebui