Submission #650803

#	Time	Username	Problem	Language	Result	Execution time	Memory
650803		groshi	Senior Postmen (BOI14_postmen)	C++17	100 / 100	400 ms	83452 KiB

postmen

#include<iostream>
#include<vector>
#include<utility>
#include<unordered_map>
#include<set>
using namespace std;
int byla[1000000];
int odw[1000000];
set<pair<int,int> > secik;
struct wi{
    vector<pair<int,int> > Q;
    int odw=0;
    int wyszlam=0;
}*w;
vector<int> stos,wynik;
int kiedy=1;
int wzielam=0;
int dokad=0;
bool czy[1000000];
void dfs(int x,int ojc)
{
    //cout<<x<<" "<<ojc<<"\n";
    stos.push_back(x);
    w[x].odw=kiedy;
    for(int i=0;i<w[x].Q.size();i++)
    {
        //cout<<"zdycham\n";
        int pom=w[x].Q[i].first;
        int ktora=w[x].Q[i].second;
        while(czy[ktora]==1)
        {
            swap(w[x].Q[i],w[x].Q.back());
            w[x].Q.pop_back();
            if(i>=w[x].Q.size())
                break;
            pom=w[x].Q[i].first;
            ktora=w[x].Q[i].second;
        }
        //cout<<"zdycham 2\n";
        if(i>=w[x].Q.size())
            break;
        if(pom==ojc)
            continue;
        if(w[pom].odw==kiedy && w[pom].wyszlam==kiedy)
            continue;
        if(w[pom].odw!=kiedy)
        {
            dfs(pom,x);
            if(dokad==0)
            continue;
            czy[ktora]=1;
            cout<<stos.back()<<" ";
            if(dokad!=x)
            stos.pop_back();
            if(dokad==x)
            {
                cout<<"\n";
                dokad=0;
                //cout<<"tako\n";
                continue;
            }
            w[x].wyszlam=kiedy;
            //cout<<"wychodze z "<<x<<"\n";
            return;
        }
        //cout<<"bede chciec znalezc cykl od "<<x<<" do "<<pom<<"\n";
        czy[ktora]=1;
        cout<<stos.back()<<" ";
        dokad=pom;
        stos.pop_back();
        w[x].wyszlam=kiedy;
        //cout<<"umieram\n";
        return;
    }
    w[x].wyszlam=kiedy;
    stos.pop_back();
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,m,x,y;
    cin>>n>>m;
    w=new wi[n+3];
    for(int i=0;i<m;i++)
    {
        cin>>x>>y;
        w[x].Q.push_back({y,i});
        w[y].Q.push_back({x,i});
 
    }
    for(int i=1;i<=n;i++)
    {
        kiedy++;
        dfs(i,0);
    }
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int, int)':
postmen.cpp:25:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(int i=0;i<w[x].Q.size();i++)
      |                 ~^~~~~~~~~~~~~~
postmen.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |             if(i>=w[x].Q.size())
      |                ~^~~~~~~~~~~~~~~
postmen.cpp:40:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         if(i>=w[x].Q.size())
      |            ~^~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 45 / 45