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Rastas's has been given a number n. Being weak at mathematics, she has to consider all the numbers from 1 to 2n - 1 so as to become perfect in calcula 阅读全文
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Shadowman loves to collect box but his roommates woogieman and itman don't like box and so shadowman wants to hide boxes as many as possible. A box ca 阅读全文
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Problem statement: A string is said to be “PATHETIC” if all the characters in it are repeated the same number of times. You are given a string of leng 阅读全文
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You are given N(1<=N<=100000) integers. Each integer is square free(meaning it has no divisor which is a square number except 1) and all the prime fac 阅读全文
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Given an array of N integers A1, A2, A3…AN. If you randomly choose two indexes i ,j such that 1 ≤ i < j ≤ N, what is the expected value of Ai | Aj? In 阅读全文
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ultmaster 男神和小迷妹们玩起了捉迷藏的游戏。 小迷妹们都希望自己被 ultmaster 男神发现，因此她们都把自己位置告诉了 ultmaster 男神，因此 ultmaster 男神知道了自己去找每个小迷妹所要花的时间。 已知发现第 i 小迷妹得到的分数为 ai⋅tr（tr 为游戏剩余时间 阅读全文
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Waca loves maths,.. a lot. He always think that 1 is an unique number. After playing in hours, Waca suddenly realize that every integer can be represe 阅读全文
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As you might already know, Ada the Ladybug is a farmer. She grows a big fruit tree (with root in 0). There is a fruit on every node of the tree. Ada i 阅读全文
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Ada the Ladybug lives near an orange tree. Instead of reading books, she investigates the oranges. The oranges on orange tree can be in up to 5*50 Sha 阅读全文