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Problem DescriptionPog and Szh are playing games.There is a sequence with $n$ numbers, Pog will choose a number A from the sequence. Szh will choose a... 阅读全文
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DescriptionSuppose we have n ropes of equal length and we want to use them to lift some heavy object. A tear-off weight t is associated to each rope, ... 阅读全文
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Description一条小溪尺寸不大，青蛙可以从左岸跳到右岸，在左岸有一石柱L，面积只容得下一只青蛙落脚，同样右岸也有一石柱R，面积也只容得下一只青蛙落脚。有一队青蛙从尺寸上一个比一个小。我们将青蛙从小到大，用1，2，…，n编号。规定初始时这队青蛙只能趴在左岸的石头L上，当然是一个落一个，小的落在... 阅读全文