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Problem I: qwb VS 去污棒 Time Limit: 2 Sec Memory Limit: 256 MB Submit: 95 Solved: 36 [Submit][Status][Web Board] Descriptionqwb表白学姐失败后，郁郁寡欢，整天坐在太阳底下赏月。在外人看来，他每天自言自语，其实他在和自己的影子“去污棒”聊天。 去污棒和qwb互相

Zero and One are good friends who always have fun with each other. This time, they decide to do something on a tree which is a kind of graph that there is only one path from node to node. First, Zero