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构造矩阵 我们希望构造一个 $n \times m$ 的整数矩阵。 构造出的矩阵需满足： 每一行上的所有元素之积均等于 $k$。 每一列上的所有元素之积均等于 $k$。 保证 $k$ 为 $1$ 或 $-1$。 请你计算，一共可以构成出多少种不同的满足条件的矩阵。 由于结果可能很大，你只需要输出对 阅读全文
posted @ 2023-10-30 08:52
onlyblues
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D. Counting Rhyme You are given an array of integers $a_1, a_2, \ldots, a_n$. A pair of integers $(i, j)$, such that $1 \le i < j \le n$, is called go 阅读全文
posted @ 2023-10-29 20:23
onlyblues
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D. Doremy's Connecting Plan Doremy lives in a country consisting of $n$ cities numbered from $1$ to $n$, with $a_i$ people living in the $i$-th city. 阅读全文
posted @ 2023-10-29 19:37
onlyblues
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E. Segment Sum You are given two integers $l$ and $r$ ($l \le r$). Your task is to calculate the sum of numbers from $l$ to $r$ (including $l$ and $r$ 阅读全文
posted @ 2023-10-25 20:47
onlyblues
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E. Time Travel Berland is a country with ancient history, where roads were built and destroyed for centuries. It is known that there always were $n$ c 阅读全文
posted @ 2023-10-24 18:40
onlyblues
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Minimum Changes to Make K Semi-palindromes Given a string s and an integer k, partition s into k substrings such that the sum of the number of letter 阅读全文
posted @ 2023-10-24 16:16
onlyblues
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D2. Dances (Hard Version) This is the hard version of the problem. The only difference is that in this version $m \leq 10^9$. You are given two arrays 阅读全文
posted @ 2023-10-23 23:56
onlyblues
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B. Raspberries You are given an array of integers $a_1, a_2, \ldots, a_n$ and a number $k$ ($2 \leq k \leq 5$). In one operation, you can do the follo 阅读全文
posted @ 2023-10-23 19:34
onlyblues
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C. Medium Design The array $a_1, a_2, \ldots, a_m$ is initially filled with zeroes. You are given $n$ pairwise distinct segments $1 \le l_i \le r_i \l 阅读全文
posted @ 2023-10-23 17:28
onlyblues
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koishi的数学题 题目描述 Koishi 在 Flandre 的指导下成为了一名数学大师，她想了一道简单的数学题。 输入一个整数 $n$，设 $\displaystyle f(x) = \sum_{i=1}^n x \bmod i$，你需要输出 $f(1), f(2), \ldots , f(n 阅读全文
posted @ 2023-10-21 14:21
onlyblues
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