摘要： 描述 无向连通图 G 有 n 个点，n-1 条边。点从 1 到 n 依次编号，编号为 i 的点的权值为 WiWi， 每条边的长度均为 1。图上两点(u, v)的距离定义为 u 点到 v 点的最短距离。对于图 G 上的点对(u, v)，若它们的距离为 2，则它们之间会产生WuWu×WvWv的联合权值。 阅读全文

摘要： 青蛙的约会 Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 105587 Accepted: 20789 Description 两只青蛙在网上相识了，它们聊得很开心，于是觉得很有必要见一面。它们很高兴地发现它们住在同一条纬度线上 阅读全文

摘要： Fibonacci Again Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 52548 Accepted Submission(s): 248 阅读全文

摘要： Palindrome Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 60290 Accepted: 20998 Description A palindrome is a symmetrical string, that is, 阅读全文

摘要： E. New Year Treetime limit per test3 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputThe New Year holidays are over, 阅读全文

摘要： Snacks Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1277 Accepted Submission(s): 292 Problem 阅读全文

摘要： Apple Tree Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 25711 Accepted: 7624 Description There is an apple tree outside of kaka's house. 阅读全文

摘要： Counting Offspring Time Limit: 15000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2424 Accepted Submission(s): 阅读全文

摘要： The Social Network Time Limit: 3000/2000 MS (Java/Others) Memory Limit: 65768/65768 K (Java/Others)Total Submission(s): 2958 Accepted Submission(s): 8 阅读全文

摘要： Anniversary Cake Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 16579 Accepted: 5403 Description Nahid Khaleh decides to invite the kids o 阅读全文