Submission #31537

#	Time	Username	Problem	Language	Result	Execution time	Memory
31537		Kanvie	Senior Postmen (BOI14_postmen)	C++14	0 / 100	855 ms	14456 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
int n,m,x,y,vv,u,visit[500001],fi;
map<pair<int,int>,bool>mp;
vector<int>v[500001],ans;
stack<int>s;
int main()
{
    cin>>n>>m;
    for(int i=1;i<=m;++i)
    {
        cin>>x>>y;
        mp[{x,y}]=true;
        mp[{y,x}]=true;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    s.push(1);
    while(!s.empty())
    {
        u=s.top();
        for(int i=0;i<v[u].size();++i)
        {
            vv=v[u][i];
            if(mp[{vv,u}]==true)
            {
                mp[{vv,u}]=false;
                mp[{u,vv}]=false;
                break;
            }
            if(i==v[u].size()-1)vv=-1;
        }
        if(vv!=-1)s.push(vv);
        else {s.pop();ans.push_back(u);}
    }
    fi=0;
    for(int i=0;i<ans.size();++i)
    {
        if(visit[ans[i]]==0)
        {
            s.push(ans[i]);
            visit[ans[i]]=1;
        }
        else
        {
            if(fi==1)cout<<endl;
            else fi=1;
            while(1)
            {
                if(s.top()!=ans[i])cout<<s.top()<<' ';
                else cout<<s.top();
                if(s.top()!=ans[i]){visit[s.top()]=0;s.pop();}
                else break;
            }
        }
    }
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<v[u].size();++i)
                     ~^~~~~~~~~~~~
postmen.cpp:31:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(i==v[u].size()-1)vv=-1;
                ~^~~~~~~~~~~~~~~
postmen.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<ans.size();++i)
                 ~^~~~~~~~~~~

• Subtask 1: 0 / 38
• Subtask 2: 0 / 17
• Subtask 3: 0 / 45