제출 #581597

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
581597	2022-06-22 20:14:15	penguinhacker	Semafor (COI20_semafor)	C++17	100 / 100	207 ms	632 KiB

semafor

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
const int M=1e9+7;
ll bin_pow(ll b, ll p=M-2) {
  ll r=1;
  for (; p; p/=2, b=b*b%M)
    if (p%2)
      r=r*b%M;
  return r;
}
struct Mat {
  int n, m;
  vector<vector<int>> a;
  Mat() {}
  Mat(int n, int m) : n(n), m(m) {a.assign(n, vector<int>(m));}
  vector<int>& operator[](int i) {return a[i];}
  const vector<int>& operator[](int i) const {return a[i];}
  Mat operator*(const Mat& b) const {
    assert(m==b.n); Mat r(n, b.m);
    for (int i=0; i<n; ++i) for (int j=0; j<m; ++j) for (int k=0; k<b.m; ++k) r[i][k]=(r[i][k]+(ll)a[i][j]*b[j][k])%M;
    return r;
  };
};
 
 
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