Submission #172941

#	Time	Username	Problem	Language	Result	Execution time	Memory
172941		phillip	Potemkin cycle (CEOI15_indcyc)	C++14	50 / 100	1094 ms	115696 KiB

indcyc

#include<bits/stdc++.h>
#define ll long long
using namespace std;
int vis[1009][1009],dep[1009];
vector<int>v[1009][1009],vv[1009];
vector<pair<int,int> >p;
int cn[1009][1009];
int n,m,d;
vector<int>c;
void checkmn(int x,int par)
{
    int mxd=0;
    for(int i=0;i<v[par][x].size();i++)
    {
        mxd=max(mxd,dep[v[par][x][i]]);
    }
    for(int i=mxd;i<c.size()-1;i++)
    {
        if(cn[c[i]][c[i+1]]==0)
        {
            return;
        }
    }
    for(int i=mxd;i<c.size();i++)
    {
        cout<<c[i]+1<<" ";
    }
    exit(0);
}
void dfs(int x,int par)
{
    //cout<<x<<" "<<par<<"\n";
    dep[x]=d;
    d++;
    vis[par][x]=1;
    c.push_back(x);
    for(int i=0;i<v[par][x].size();i++)
    {
        int y=v[par][x][i];
        //if(vis[x][y])continue;
        if(dep[y]!=-1)
        {
            checkmn(x,par);
        }
        else dfs(y,x);
    }
    dep[x]=-1;
    d--;
    c.pop_back();
}
int main()
{
    memset(dep,-1,sizeof(dep));
    cin>>n>>m;
    int x,y;
    for(int i=0;i<m;i++)
    {
        cin>>x>>y;
        x--;y--;
        p.push_back({x,y});
        cn[x][y]=1;
        cn[y][x]=1;
        vv[x].push_back(y);
        vv[y].push_back(x);
    }
    for(int i=0;i<m;i++)
    {
        x=p[i].first;
        y=p[i].second;
        //cout<<x<<" "<<y<<": ";
        for(int j=0;j<vv[y].size();j++)
        {
            if(vv[y][j]==x)continue;
            if(cn[vv[y][j]][x])continue;
            v[x][y].push_back(vv[y][j]);
          //  cout<<v[x][y].back()<<" ";
        }
        swap(x,y);
        //cout<<"\n";
        //cout<<x<<" "<<y<<": ";
        for(int j=0;j<vv[y].size();j++)
        {
            if(vv[y][j]==x)continue;
            if(cn[vv[y][j]][x])continue;
            v[x][y].push_back(vv[y][j]);
      //      cout<<v[x][y].back()<<" ";
        }
    //    cout<<"\n";
    }
    d=1;
    for(int i=0;i<m;i++)
    {
        x=p[i].first;
        y=p[i].second;
        c.clear();
        if(vis[x][y]==0)
        {
            dep[x]=0;
            c.push_back(x);
            dfs(y,x);
            c.pop_back();
            dep[x]=-1;
        }
        swap(x,y);
        c.clear();
        //if(vis[x][y]==0)
        //{
            dep[x]=0;
            c.push_back(x);
            dfs(y,x);
            c.pop_back();
            dep[x]=-1;
        //}
    }
    cout<<"no";
}

Compilation message (stderr)

indcyc.cpp: In function 'void checkmn(int, int)':
indcyc.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[par][x].size();i++)
                 ~^~~~~~~~~~~~~~~~~
indcyc.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=mxd;i<c.size()-1;i++)
                   ~^~~~~~~~~~~
indcyc.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=mxd;i<c.size();i++)
                   ~^~~~~~~~~
indcyc.cpp: In function 'void dfs(int, int)':
indcyc.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[par][x].size();i++)
                 ~^~~~~~~~~~~~~~~~~
indcyc.cpp: In function 'int main()':
indcyc.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<vv[y].size();j++)
                     ~^~~~~~~~~~~~~
indcyc.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<vv[y].size();j++)
                     ~^~~~~~~~~~~~~

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