Unango的博客

#include<bits/stdc++.h> using namespace std; typedef long long ll; const int Matr = 4; const ll mod = 1e9 + 7; class mat { public: ll a[Matr][Matr], size; mat(int len){ size = len; memse...

typedef long long ll; const ll mod = 1e9+7; const int mmax = 1e5 + 10; ll fac[mmax + 5]; ll inv[mmax + 5]; ll qpow(ll a, ll b)  {      ll r = 1, t = a;      while (b) {          if (b & 1)r = (r*...