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Description Little Mishka is a great traveller and she visited many countries. After thinking about where to travel this time, she chose XXX — beautif 阅读全文
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Problem Description 电子科大本部食堂的饭卡有一种很诡异的设计,即在购买之前判断余额。如果购买一个商品之前,卡上的剩余金额大于或等于5元,就一定可以购买成功(即使购买后卡上余额为负),否则无法购买(即使金额足够)。所以大家都希望尽量使卡上的余额最少。某天,食堂中有n种菜出售,每种菜 阅读全文
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Sometimes some mathematical results are hard to believe. One of the common problems is the birthday paradox. Suppose you are in a party where there ar 阅读全文
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Description There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on thes 阅读全文
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Problem Description Once again, James Bond is fleeing from some evil people who want to see him dead. Fortunately, he has left a bungee rope on a near 阅读全文
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Fox Ciel is playing a mobile puzzle game called "Two Dots". The basic levels are played on a board of size n × m cells, like this: Each cell contains 阅读全文