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有一个长度为 arrLen 的数组，开始有一个指针在索引 0 处。 每一步操作中，你可以将指针向左或向右移动 1 步，或者停在原地（指针不能被移动到数组范围外）。 给你两个整数 steps 和 arrLen ，请你计算并返回：在恰好执行 steps 次操作以后，指针仍然指向索引 0 处的方案数。 由 阅读全文
posted @ 2021-05-13 11:24
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Prof. Pang plays chess against his rival Prof. Shou. They are the only two players in the game. The chessboard is very large and can be viewed as a 2D 阅读全文
posted @ 2021-05-12 23:31
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With the rapid development of society, the demand for high-precision clocks is constantly rising. Recently, the China Clock Production Company is deve 阅读全文
posted @ 2021-05-12 17:02
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While we enjoy chatting with friends on the internet, it is always annoying that we are overwhelmed by lots of messages in various chat groups. A grea 阅读全文
posted @ 2021-05-12 00:59
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It's a sunny day with good scenery, and you come to the park for a walk. You feel curious that there are many old guys gathering by a bridge, and want 阅读全文
posted @ 2021-05-11 22:47
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Alduhmellah and Behlah both like large numbers, lots of numbers and lots of large numbers. They also like to do calculations on those numbers. One day 阅读全文
posted @ 2021-05-11 21:14
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Yen-Jen loves cat very much. Now, there are 10^{18}1018 cats standing in a line, the i^ith cat's cost value c_ic**i is equal to ii, the i^ith cat's in 阅读全文
posted @ 2021-05-11 19:46
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有公式： \(num = \lfloor \frac{x}{p} \rfloor + \lfloor \frac{x}{p^2} \rfloor + \lfloor \frac{x}{p^3} \rfloor + ....\) $\lfloor \frac{pk} \rfloor$相当于1到n中$p 阅读全文
posted @ 2021-05-11 19:41
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给你一个整数数组 perm ，它是前 n 个正整数的排列，且 n 是个 奇数 。 它被加密成另一个长度为 n - 1 的整数数组 encoded ，满足 encoded[i] = perm[i] XOR perm[i + 1] 。比方说，如果 perm = [1,3,2] ，那么 encoded = 阅读全文
posted @ 2021-05-11 19:28
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ABC Conjecture Time limit: 3 seconds Figure 1: Shinichi Mochizuki The ABC conjecture (also known as the Oesterle–Masser conjec- ´ ture) is a famous co 阅读全文
posted @ 2021-05-11 17:20
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