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题目描述 Fennec and Snuke are playing a board game. On the board, there are N cells numbered 1 through N, and N−1 roads, each connecting two cells. Cell a 阅读全文
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题目描述 There are N towns on a plane. The i-th town is located at the coordinates (xi,yi). There may be more than one town at the same coordinates. You c 阅读全文
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题目描述 JSZKC is going to spend his vacation! His vacation has N days. Each day, he can choose a T-shirt to wear. Obviously, he doesn’t want to wear a si 阅读全文
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题目描述 Let’s consider some math problems. JSZKC has a set A={1,2,…,N}. He defines a subset of A as ‘Meo set’ if there doesn’t exist two integers in this 阅读全文
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题目描述 There are N cities. There are also K roads and L railways, extending between the cities. The i-th road bidirectionally connects the pi-th and qi- 阅读全文
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题目描述 Alice and Bob are playing a stone game. There are n piles of stones. In each turn, a player can remove some stones from a pile (the number must b 阅读全文