Submission #46951

#	Time	Username	Problem	Language	Result	Execution time	Memory
46951		iletavcioski	Pipes (CEOI15_pipes)	C++17	0 / 100	208 ms	65536 KiB

pipes

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
vector<int> rednibr(2070004,0);
vector<int> artocki;
vector<vector<int> > v;
int broj=0;
int dfs(int x,int pr,int broj)
{
    int minbr=broj;
    int granki=0;
    int t;
    int maxi=0;
    rednibr[x]=broj;
    for(int i=0;i<v[x].size();i++)
    {
        if(v[x][i]==pr)
            continue;
        if(rednibr[v[x][i]])
            minbr=min(minbr,rednibr[v[x][i]]);
        else
        {
            int t=dfs(v[x][i],x,broj+1);
            minbr=min(minbr,t);
            maxi=max(maxi,t);
            granki++;
        }
    }
    if(x==0)
    {
        if(granki>1)
            artocki.push_back(x);
    }
    else
    {
        if(maxi>=rednibr[x])
            artocki.push_back(x);
    }
    return minbr;
}
int main()
{
    int n;
    cin>>n;
    int m;
    cin>>m;
    vector<int> vec;
    vector<int> s,e;
    v.insert(v.begin(),n+m+4,vec);
    int nov=m;
    for(int i=0;i<m;i++)
    {
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        s.push_back(a);
        e.push_back(b);
        v[a].push_back(nov);
        v[b].push_back(nov);
        v[nov].push_back(a);
        v[nov].push_back(b);
        nov++;
    }
    dfs(0,-1,1);
    sort(artocki.begin(),artocki.end());
    for(int i=0;i<artocki.size();i++)
    {
        if(artocki[i]>=m)
            cout<<s[artocki[i]-m]+1<<" "<<e[artocki[i]-m]+1<<endl;
    }
    cout<<endl;
    return 0;
}
/*
9 11
1 2
2 3
3 1
3 4
4 5
5 6
6 4
6 7
7 8
8 9
9 7
*/

Compilation message (stderr)

pipes.cpp: In function 'int dfs(int, int, int)':
pipes.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[x].size();i++)
                 ~^~~~~~~~~~~~
pipes.cpp:13:9: warning: unused variable 't' [-Wunused-variable]
     int t;
         ^
pipes.cpp: In function 'int main()':
pipes.cpp:68:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<artocki.size();i++)
                 ~^~~~~~~~~~~~~~~

• 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