T1 Problem 洛谷 Solution 感觉我写的也不是正解... 我是先找出每个循环节的长度l...然后用快速幂求出10 ^ k % l的值.. Code #include<cmath> #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; #define ll long long ll read() {…