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C. Remove the Bracket RSJ has a sequence $a$ of $n$ integers $a_1,a_2, \ldots, a_n$ and an integer $s$. For each of $a_2,a_3, \ldots, a_{n-1}$, he cho 阅读全文
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F. Timofey and Black-White Tree Timofey came to a famous summer school and found a tree on $n$ vertices. A tree is a connected undirected graph withou 阅读全文
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斐波那契前 n 项和 大家都知道 Fibonacci 数列吧，$f_1=1,f_2=1,f_3=2,f_4=3, \ldots ,f_n=f_{n−1}+f_{n−2}$。 现在问题很简单，输入 $n$ 和 $m$，求 $f_n$ 的前 $n$ 项和 $S_n \bmod m$。 输入格式 共一行， 阅读全文
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最幸运的数字 $8$ 是中国的幸运数字，如果一个数字的每一位都由 $8$ 构成则该数字被称作是幸运数字。 现在给定一个正整数 $L$，请问至少多少个 $8$ 连在一起组成的正整数（即最小幸运数字）是 $L$ 的倍数。 输入格式 输入包含多组测试用例。 每组测试用例占一行，包含一个整数 $L$。 当输 阅读全文
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B. GCD Partition While at Kira's house, Josuke saw a piece of paper on the table with a task written on it. The task sounded as follows. There is an a 阅读全文
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D. Fixed Prefix Permutations You are given $n$ permutations $a_1, a_2, \dots, a_n$, each of length $m$. Recall that a permutation of length $m$ is a s 阅读全文
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Rank Transform of a Matrix Given an m x n matrix , return a new matrix answer where answer[row][col] is the rank of matrix[row][col] . The rank is an 阅读全文
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Minimum Cost to Split an Array You are given an integer array nums and an integer $k$. Split the array into some number of non-empty subarrays. The co 阅读全文
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B. Emordnilap A permutation of length $n$ is an array consisting of $n$ distinct integers from $1$ to $n$ in arbitrary order. For example, $[2,3,1,5,4 阅读全文
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C. Quiz Master A school has to decide on its team for an international quiz. There are $n$ students in the school. We can describe the students using 阅读全文