Submission #659274

#	Time	Username	Problem	Language	Result	Execution time	Memory
659274		mychecksedad	Amusement Park (CEOI19_amusementpark)	C++17	19 / 100	173 ms	21500 KiB

amusementpark

/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD1 (1000000000+7)
#define MOD (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;


int n, m;
ll e[20][20];

void solve(){
    cin >> n >> m;
    for(int i = 1; i <= n; ++i) for(int j = 1; j <= n; ++j) e[i][j] = -1;
    for(int i = 1; i <= m; ++i){
        int u, v; cin >> u >> v;
        e[u][v] = i - 1;
    }
    vector<int> a;
    for(int i=1; i<=n; ++i) a.pb(i);
    ll ans = 0;
    map<ll, bool> taken;
    do{ 
        ll c = 0, h = 0;
        for(int i = 1; i < n; ++i){
            for(int j = 0; j < i; ++j){
                int u = a[j], v = a[i];
                if(e[u][v] == -1 && e[v][u] > -1){
                    c++;
                    h += (1 << e[v][u]);
                } 
            }
        }
        if(!taken[h]) taken[h] = 1, (ans += c) %= MOD;
    }while(next_permutation(a.begin(), a.end()));
    cout << ans;
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message (stderr)

amusementpark.cpp: In function 'int main()':
amusementpark.cpp:54:16: warning: unused variable 'aa' [-Wunused-variable]
   54 |     int T = 1, aa;
      |                ^~

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