CF450B Jzzhu and Sequences 大佬留言:这.这.不就是矩乘的模板吗,切掉它!! You are given xx and yy , please calculate $f_{n}(mod(10^{9}+7))$. 原式:$f_{i}=f_{i-1}+f_{i+1}$ 转换一下:$f_{i+1}=f_{i}-f_{i-1}$ 相当于$f_{i}=f_{i-1}-f_{i-2}$ 有没有发现它跟斐波那契通项公式有点儿类似? 的确是这样的,那么转移矩阵也类似: $0 -1$ $…

题目链接: B. Jzzhu and Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Jzzhu has invented a kind of sequences, they meet the following property: You are given x and y, please calculat…

Jzzhu has invented a kind of sequences, they meet the following property: You are given x and y, please calculate fn modulo 1000000007 (109 + 7). Input The first line contains two integers x and y (|x|, |y| ≤ 109). The second line contains a single i…

题目链接:http://codeforces.com/problemset/problem/450/B 题意很好懂,矩阵快速幂模版题. /* | 1, -1 | | fn | | 1, 0 | | fn-1 | */ #include <iostream> #include <cstdio> #include <cstring> using namespace std; typedef __int64 LL; LL mod = 1e9 + ; struct data {…

Content 有一个长度为 \(n\) 的数列 \(\{a_1,a_2,\dots,a_n\}\),满足如下的递推公式: \(i=1\) 时,\(a_1=x\). \(i=2\) 时,\(a_2=y\). \(i\geqslant 3\) 时,\(a_i=a_{i-1}+a_{i+1}\). 求 \(a_n\bmod 10^9+7\) 的值. 数据范围:\(1\leqslant n\leqslant 2\times 10^9\),\(|x|,|y|\leqslant 10^9\). Solut…

CodeForces 450B Jzzhu and Sequences (矩阵优化) Description Jzzhu has invented a kind of sequences, they meet the following property: \[f_1=x\] \[f_2=y\] \[f_i=f_{i-1}+f_{i+1}\text {(i>2)}\] You are given x and y, please calculate fn modulo 1000000007 (10…

题目链接:https://vjudge.net/problem/CodeForces-450B B. Jzzhu and Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Jzzhu has invented a kind of sequences, they meet the following proper…

题目链接:http://codeforces.com/problemset/problem/450/B B. Jzzhu and Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Jzzhu has invented a kind of sequences, they meet the following pr…

B. Jzzhu and Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Jzzhu has invented a kind of sequences, they meet the following property: You are given x and y, please calculate fn m…

A - Jzzhu and Sequences   Jzzhu has invented a kind of sequences, they meet the following property: You are given x and y, please calculate fn modulo 1000000007 (109 + 7). Input The first line contains two integers x and y (|x|, |y| ≤ 109). The secon…