Submission #1095900

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095900		alexander707070	Amusement Park (CEOI19_amusementpark)	C++14	42 / 100	3076 ms	162132 KiB

amusementpark

#include<bits/stdc++.h>
#define MAXN 600007
using namespace std;

const int mod=998244353;

const long long modd=1e15+1;

int n,m,a[4000],b[4000];

int perm[20],ans;
long long power[4000];

unordered_map<long long,int> s;

void check(){
    int c=0;
    long long hesh=0;

    for(int i=1;i<=m;i++){
        if(perm[a[i]]>perm[b[i]]){
            c++; hesh+=power[i];
        }
    }

    s[hesh]=c;
}

int main(){

    cin>>n>>m;

    power[0]=1;
    for(int i=1;i<=m;i++){
        cin>>a[i]>>b[i];

        power[i]=(power[i-1]*2)%modd;
    }

    for(int i=1;i<=n;i++)perm[i]=i;

    do{
        check();
    }while(next_permutation(perm+1,perm+n+1));

    for(pair<long long,int> curr:s){
        ans+=curr.second; ans%=mod;
    }

    cout<<ans<<"\n";


    return 0;
}

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