摘要：题目链接：https://vjudge.net/contest/241341#problem/C Tree Land Kingdom is a prosperous and lively kingdom. It has N cities which are connected to each oth 阅读全文

摘要：题目链接：https://vjudge.net/contest/237394#problem/E A palindrome is a word, number, or phrase that reads the same forwards as backwards. For example, the 阅读全文

摘要：题目链接：http://codeforces.com/problemset/problem/669/D D. Little Artem and Dance time limit per test 2 seconds time limit per test memory limit per test 阅读全文