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Caocao’s BridgesDescriptionCaocao was defeated by Zhuge Liang and Zhou Yu in the battle of Chibi. But he wouldn’t give up. Caocao’s army still was not good at water battles, so he came up with another

2730: [HNOI2012]矿场搭建Time Limit: 10 Sec Memory Limit: 128 MB Submit: 2340 Solved: 1086 [Submit][Status][Discuss]Description煤矿工地可以看成是由隧道连接挖煤点组成的无向图。为安全起见，希望在工地发生事故时所有挖煤点的工人都能有一条出路逃到救援出口处。于是矿主决定在某些挖煤点

Recognizing These Guys, We Find Social Networks UsefulDescriptionSocial Network is popular these days.The Network helps us know about those guys who we are following intensely and makes us keep up our

1123: [POI2008]BLOTime Limit: 10 Sec Memory Limit: 162 MB Submit: 1319 Solved: 598 [Submit][Status][Discuss]DescriptionByteotia城市有n个 towns m条双向roads. 每条 road 连接 两个不同的 towns ,没有重复的road. 所有towns连通。In