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Given an increasing sequence of integers a1, a2, a3, . . . , ak, the E-transform produces a sequence of thesame length, b1, b2, b3, . . . , bk such th... 阅读全文
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Given n points on the XY plane, count how many regular rectangles are formed. A rectangle is regular if and only if its sides are all parallel to the ... 阅读全文
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1296: [SCOI2009]粉刷匠Descriptionwindy有 N 条木板需要被粉刷。 每条木板被分为 M 个格子。 每个格子要被刷成红色或蓝色。 windy每次粉刷，只能选择一条木板上一段连续的格子，然后涂上一种颜色。 每个格子最多只能被粉刷一次。 如果windy只能粉刷 T 次，他最多... 阅读全文
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C. New Year and DominoThey say "years are like dominoes, tumbling one after the other". But would a year fit into a grid? I don't think so.Limak is a ... 阅读全文
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B. New Year and Old PropertyThe year 2015 is almost over.Limak is a little polar bear. He has recently learnt about the binary system. He noticed that... 阅读全文
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A. New Year and DaysToday is Wednesday, the third day of the week. What's more interesting is that tomorrow is the last day of the year 2015.Limak is ... 阅读全文
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题意： 求[n, m]之间包含0的数字的个数题解：转化为求solve(n) - solve(m-1)的前缀问题 对于求0到n的解，我们举例 n = 25789 对于8这位，让其为0对答案的贡献是 （0~257）*（0~9） 假设是 n = 25709 那么让这位为0的答案贡献是... 阅读全文
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Consider this sequence {1, 2, 3, . . . , N}, as a initial sequence of first N natural numbers. You canearrange this sequence in many ways. There will b... 阅读全文
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Children are always sweet but they can sometimes make you feel bitter. In this problem, you will seehow Tintin, a five year’s old boy, creates trouble ... 阅读全文
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An integer is divisible by 3 if the sum of its digits is also divisible by 3. For example, 3702 is divisibleby 3 and 12(3+7+0+2) is also divisible by ... 阅读全文