Codeforces 915E Physical Education Lessons
题目链接:http://codeforces.com/contest/915/problem/E 题意:序列[ […]
题目链接:http://codeforces.com/contest/915/problem/E 题意:序列[ […]
题目链接:https://www.lydsy.com/JudgeOnline/problem.php?id=1 […]
题目链接:http://codeforces.com/contest/896/problem/C 题意:略。 […]
题目链接:http://codeforces.com/contest/343/problem/D 题意:给一棵 […]