题目描述 农民约翰在一片边长是N (2 <= N <= 250)英里的正方形牧场上放牧他的奶牛。 […]

题目描述 图一表示一次街道赛跑的跑道。可以看出有一些路口（用 0 到 N 的整数标号），和连接这些路口的箭头。 […]

题目描述 你赢得了一场航空公司举办的比赛，奖品是一张加拿大环游机票。旅行在这家航空公司开放的最西边的城市开始， […]

题目描述 A poker deck contains 52 cards. Each card has a su […]

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题目描述 The 15-puzzle is a very popular game: you have cer […]

题目描述 My little sister had a beautiful necklace made of […]

题目描述 A monocycle is a cycle that runs on one wheel. We […]

题目描述 A particularly inefficient telephone company seeks […]