Submission #573358

#	Time	Username	Problem	Language	Result	Execution time	Memory
573358		vladislav11	Pipes (CEOI15_pipes)	C++14	0 / 100	1715 ms	65536 KiB

pipes

#include <bits/stdc++.h>

using namespace std;

int n, m;
vector< vector<int> > grp;
vector<int> a, used;

void dfs ( int v, int p )
{
    used[v] = 1;

    for ( auto& to : grp[v] )
    if ( to != p )
    {
        if ( used[to] )
        {
            a[v]++;
            a[to]--;
        }
        else
        {
            dfs( to, v );

            a[v] += a[to];

            if ( !a[to] )
                cout << v << ' ' << to << '\n';
        }
    }

    return;
}

int main ()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;

    grp.assign( n+1, vector<int>() );

    for ( int i=0; i<m; i++ )
    {
        int u, v;
        cin >> u >> v;

        grp[u].push_back( v );
        grp[v].push_back( u );
    }

    a.assign( n+1, 0 );
    used.assign( n+1, 0 );

    for ( int i=1; i<=n; i++ )
    if ( !used[i] )
        dfs( i, -1 );

    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10