Submission #1087336

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087336		mychecksedad	Amusement Park (CEOI19_amusementpark)	C++17	0 / 100	1 ms	348 KiB

amusementpark

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD1 (1000000000+7)
#define MOD (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 100+100, M = 2e5+10, K = 52, MX = 30;


int n, m, to[N][N];
ll dp[M], f[N];
void solve(){
  cin >> n >> m;
  for(int i = 0; i <= n; ++i) for(int j = 0; j <= n; ++j) to[i][j] = 0;
  f[0] = 1;
  for(ll i = 1; i <= n; ++i) (f[i]=f[i-1]*i)%=MOD;
  for(int i = 1; i <= m; ++i){
    int u, v; cin >> u >> v;
    --u, --v;
    to[u][v] = 1;
    to[v][u] = -1;
  }
  for(int mask = 0; mask < (1<<n); ++mask){
    if(__builtin_popcount(mask) <= 1){
      dp[mask] = 0;
      continue;
    }
    vector<int> v;
    dp[mask] = 0;
    for(int i = 0; i < n; ++i) if((1<<i)&mask) v.pb(i);
    int s = v.size();
    for(int i = 0; i < v.size(); ++i){
      ll cost = 0;
      for(int j: v){
        if(v[i] != j){
          if(to[v[i]][j] == 1) ++cost;
        }
      }
      dp[mask] += dp[mask^(1<<v[i])] + f[s - 1] * cost;
      dp[mask] %= MOD;
    }
  }
  cout << dp[(1<<n)-1];
} 


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

amusementpark.cpp: In function 'void solve()':
amusementpark.cpp:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for(int i = 0; i < v.size(); ++i){
      |                    ~~^~~~~~~~~~
amusementpark.cpp: In function 'int main()':
amusementpark.cpp:56:15: warning: unused variable 'aa' [-Wunused-variable]
   56 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 21
• Subtask 5: 0 / 37