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A wqb-number, or B-number for short, is a non-negative integer whose decimal form contains the sub- string "13" and can be divided by 13. For example, 阅读全文
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Description A straight dirt road connects two fields on FJ's farm, but it changes elevation more than FJ would like. His cows do not mind climbing up 阅读全文
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Description FJ has purchased N (1 <= N <= 2000) yummy treats for the cows who get money for giving vast amounts of milk. FJ sells one treat per day an 阅读全文
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Description "Help Jimmy" 是在下图所示的场景上完成的游戏。 场景中包括多个长度和高度各不相同的平台。地面是最低的平台，高度为零，长度无限。 Jimmy老鼠在时刻0从高于所有平台的某处开始下落，它的下落速度始终为1米/秒。当Jimmy落到某个平台上时，游戏者选择让它向左还是向右 阅读全文