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Reversible Primes A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal 阅读全文
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Waiting in Line Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two 阅读全文
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Battle Over Cities It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the highways 阅读全文
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The Best Rank To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Lan 阅读全文
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Radix Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is yes, if 6 is a decimal number and 11 阅读全文
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Product of Polynomials （25 分） This time, you are supposed to find A×B where A and B are two polynomials. Input Specification: Each input file contains 阅读全文
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免费馅饼 都说天上不会掉馅饼，但有一天gameboy正走在回家的小径上，忽然天上掉下大把大把的馅饼。说来gameboy的人品实在是太好了，这馅饼别处都不掉，就掉落在他身旁的10米范围内。馅饼如果掉在了地上当然就不能吃了，所以gameboy马上卸下身上的背包去接。但由于小径两侧都不能站人，所以他只能在 阅读全文
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Doing Homework Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadline of ha 阅读全文
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Ignatius and the Princess IV "OK, you are not too bad, em... But you can never pass the next test." feng5166 says. "I will tell you an odd number N, a 阅读全文
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非常可乐 大家一定觉的运动以后喝可乐是一件很惬意的事情，但是seeyou却不这么认为。因为每次当seeyou买了可乐以后，阿牛就要求和seeyou一起分享这一瓶可乐，而且一定要喝的和seeyou一样多。但seeyou的手中只有两个杯子，它们的容量分别是N 毫升和M 毫升 可乐的体积为S （S<101 阅读全文