제출 #868919

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
868919	2023-11-02 12:32:08	Cyber_Wolf	Magneti (COCI21_magneti)	C++17	110 / 110	279 ms	199848 KiB

Main

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#include <bits/stdc++.h>
using namespace std;
#define lg long long 
const lg N = 2e5+5, MOD = 1e9+7;
lg v[N], fact[N];
lg fast_power(lg n, lg k)
{
  lg ans = 1;
  while(k)
  {
    if((k&1))
    {
      ans = (ans*n)%MOD;
    }
    n = (n*n)%MOD;
    k >>= 1;
  }
  return ans;
}
lg C(lg n, lg r)
{
  lg ans = fact[n];
  ans = (ans*fast_power(fact[r], MOD-2))%MOD;
  ans = (ans*fast_power(fact[n-r], MOD-2))%MOD;
 
 
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