Submission #726336

#	Time	Username	Problem	Language	Result	Execution time	Memory
726336		Rafi22	Amusement Park (CEOI19_amusementpark)	C++14	0 / 100	1 ms	328 KiB

amusementpark

#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
#define mp make_pair
ll mod=998244353;
int inf=1000000007;
ll infl=1000000000000000007;

const int N=18;

ll DP[(1<<N)];
ll ile[(1<<N)];
int G[N];
int RG[N];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,m,a,b;
    cin>>n>>m;
    for(int i=0;i<m;i++)
    {
        cin>>a>>b;
        a--,b--;
        G[a]^=(1<<b);
        RG[b]^=(1<<a);
    }
    for(int x=1;x<(1<<n);x++)
    {
        bool ok=1;
        for(int j=0;j<n;j++)
        {
            if((x&(1<<j))==0) continue;
            if(((G[j]|RG[j])&x)!=0) ok=0;
        }
        ile[x]=ok;
    }
    for(int x=1;x<(1<<n);x++)
    {
        for(int y=x;y>0;y=(y-1)&x)
        {
            bool ok=1;
            ll cnt=0;
            for(int j=0;j<n;j++)
            {
                if((y&(1<<j))==0) continue;
                if(((G[j]|RG[j])&(x^y))==0) ok=0;
                if(((G[j]|RG[j])&y)!=0) ok=0;
                cnt+=__builtin_popcount(RG[j]&(x^y));
            }
            if(ok)
            {
                DP[x]=(DP[x]+ile[x^y]*cnt+DP[x^y])%mod;
                ile[x]=(ile[x]+ile[x^y])%mod;
            }
        }
    }
    cout<<DP[(1<<n)-1];
    return 0;
}

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