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D. Sum in the tree 题目链接：https://codeforces.com/contest/1099/problem/D 题意： 给出一棵树，以及每个点的si，这里的si代表从i号结点到根节点的权值和。但是有些si=-1，这就相当于丢失了当前结点的数据。 假设原本每个点的权值为ai 阅读全文
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Warm up Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 9073 Accepted Submission(s): 2120 题目链接：h 阅读全文
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Redundant Paths 题目链接：http://poj.org/problem?id=3177 Description: In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbere 阅读全文
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Network 题目链接：http://poj.org/problem?id=3694 Description: A network administrator manages a large network. The network consists of N computers and M li 阅读全文
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Critical Links 题目链接：https://vjudge.net/problem/UVA-796 Description: In a computer network a link L, which interconnects two servers, is considered cri 阅读全文
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Network 题目链接：https://vjudge.net/problem/UVA-315 Description: A Telephone Line Company (TLC) is establishing a new telephone cable network. They are co 阅读全文
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Network of Schools 题目链接：http://poj.org/problem?id=1236 Description: A number of schools are connected to a computer network. Agreements have been deve 阅读全文
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Highways 题目链接：https://vjudge.net/problem/SPOJ-HIGH Description: In some countries building highways takes a lot of time... Maybe that's because there 阅读全文
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Lightning Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2465 Accepted Submission(s): 912 题目链接：h 阅读全文
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Join 题目链接：https://vjudge.net/problem/URAL-1627 Description: Businessman Petya recently bought a new house. This house has one floor with n × m square 阅读全文