摘要：Problem Description You may heard of the Joseph Problem, the story comes from a Jewish historian living in 1st century. He and his 40 comrade soldiers 阅读全文

摘要：Sasha and Kolya decided to get drunk with Coke, again. This time they have k types of Coke. i-th type is characterised by its carbon dioxide concentra 阅读全文

摘要：There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like this "How far is it if I want 阅读全文

摘要：Boxes There are NN boxes, indexed by a number from 11 to NN. Each box may (or not may not) be put into other boxes. These boxes together form a tree s 阅读全文