D. GukiZ and Binary Operations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We all know that GukiZ often plays with arrays. Now he is thinking about this problem: how many arrays a, of l…

题目传送门 /* 题意:任意排列第一个字符串,使得有最多的不覆盖a/b字符串出现 字符串处理/贪心:暴力找到最大能不覆盖的a字符串,然后在b字符串中动态得出最优解 恶心死我了,我最初想输出最多的a,再最多的b,然而并不能保证是最多的:( */ #include <cstdio> #include <cstring> #include <string> #include <iostream> #include <algorithm> #includ…

题目传送门 /* 水题:开个结构体,rk记录排名,相同的值有相同的排名 */ #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <string> #include <iostream> #include <queue> #include <map> #include <vector>…

D. GukiZ and Binary Operations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We all know that GukiZ often plays with arrays. Now he is thinking about this problem: how many arrays a, of l…

https://codeforces.com/contest/1106/problem/F 题意 数列公式为\(f_i=(f^{b_1}_{i-1}*f^{b_2}_{i-2}*...*f^{b_k}_{i-k})\)mod\(P\),给出\(f_{1}...f_{k-1}\)和\(f_{n}\),求\(f_{k}\),其中\(P\)等于998244353 题解 3是998244353的离散对数,所以\(f^{b_1}_{i-1} \equiv 3^{h_i*b_1}(modP)\),怎么求离散…

题目地址:http://codeforces.com/contest/551/problem/D 分析下公式能够知道,相当于每一位上放0或者1使得最后成为0或者1.假设最后是0的话,那么全部相邻位一定不能全是1,由于假设有一对相邻位全为1,那么这两个的AND值为1.又由于OR值是仅仅要有1.结果就为1.所以这位结果肯定为1.所以就推出了一个dp转移方程.dp[i][j]表示第i位上的数为j时的总个数.那么有: dp[i][0]=dp[i-1][0]+dp[i-1][1]; dp[i][1]=dp…

传送门 题目 \[ \begin{aligned} &f_n=c^{2*n-6}f_{n-1}f_{n-2}f_{n-3}&\\ \end{aligned} \] 思路 我们通过迭代发现\(f_n\)其实就是由\(c^{t_1},f_1^{t_2},f_2^{t_3},f_3^{t_4}\)相乘得到,因此我们可以分别用矩阵快速幂求出\(t_1,t_2,t_3,t_4\),最后用快速幂求得答案. 对于\(n<=3\)的我们直接输出即可,\(n>3\)的我们先将\(n\)减去\(3…

E. GukiZ and GukiZiana Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/551/problem/E Description Professor GukiZ was playing with arrays again and accidentally discovered new function, which he called GukiZiana. For given a…

C. GukiZ hates Boxes Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/551/problem/C Description Professor GukiZ is concerned about making his way to school, because massive piles of boxes are blocking his way. In total there…

B. ZgukistringZ Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/551/problem/B Description Professor GukiZ doesn't accept string as they are. He likes to swap some letters in string to obtain a new one. GukiZ has strings a,…