Submission #1111028

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111028		razivo	Amusement Park (CEOI19_amusementpark)	C++14	0 / 100	1 ms	336 KiB

amusementpark

#include <iostream>
#include <vector>
#include <bitset>
using namespace std;
int main()
{
    int n,m; cin>>n>>m;
    vector<vector<bool>> g(n,vector<bool>(n,false));
    for (int i = 0; i < m; ++i) {
        int x,y; cin>>x>>y; x--; y--;
        g[x][y]= true;
        g[y][x] = true;
    }
    int t = 1<<n;
    vector<int> dp(t,0);
    for (int i = 1; i < t; ++i) {
        bitset<18> s = i;
        if(s.count()==1) dp[i]=1;
        else {
            for (int k = 0; k < n; ++k) {
                if(!s[k]) continue;
                dp[i]+=dp[i-(1<<k)];
                for (int j = 0; j < k; ++j) {
                    if(!s[j]) continue;
                    if(g[k][j]) continue;
                    dp[i]-=dp[i-(1<<k)-(1<<j)];
                }
            }
        }
    }
    cout<<dp[t-1]/2*m<<endl;
}

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