摘要：F. Escape Through Leaf time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You are given a t 阅读全文

摘要：D. Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths time limit per test 3 seconds memory limit per test 256 megabytes input standard input o 阅读全文

摘要：E. Lomsat gelral time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a rooted 阅读全文