题目链接：http://codeforces.com/problemset/problem/450/BB.JzzhuandSequencestimelimitpertest1secondmemorylimitpertest256megabytesinputstandardinputoutputstandardoutpu...

题目链接：http://codeforces.com/contest/450/problem/B解题思路：找循环节。注意当f[i]是负数的时候一定要把他加上mod直到>0为止;e：-3%4==1；#include<iostream>usingnamespacestd;constintmod=1e9+7...