Submission #31550

#	Time	Username	Problem	Language	Result	Execution time	Memory
31550		Kanvie	Senior Postmen (BOI14_postmen)	C++14	38 / 100	1082 ms	16504 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
typedef pair<int,int> pii;
int n,m,vv,u,cnt,lol;
vector<pii>v[500001];
bool visit[500001],fi,edge[500001];
vector<int>ans;
stack<int>s,ss;
inline bool chk(int x)
{
    if(!edge[x]){edge[x]=true;return true;}
    else return false;
}
void push_db(int x)
{
    if(!visit[x])
    {
        ss.push(x);
        visit[x]=true;
        return;
    }
    else
    {
        if(fi)printf("\n");
        else fi=true;
        while(1)
        {
            lol=ss.top();
            if(lol!=x)printf("%d ",lol);
            else printf("%d",lol);
            if(lol!=x){visit[lol]=false;ss.pop();}
            else break;
        }
    }
}
int x,y;
int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;++i)
    {
        scanf("%d%d",&x,&y);
        ++cnt;
        v[x].push_back({y,cnt});
        v[y].push_back({x,cnt});
    }
    s.push(1);
    fi=false;
    while(!s.empty())
    {
        u=s.top();
        for(int i=0;i<v[u].size();++i)
        {
            vv=v[u][i].fi;
            if(chk(v[u][i].se))break;
            if(i==v[u].size()-1)vv=-1;
        }
        if(vv!=-1)s.push(vv);
        else {s.pop();push_db(u);}
    }
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<v[u].size();++i)
                     ~^~~~~~~~~~~~
postmen.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(i==v[u].size()-1)vv=-1;
                ~^~~~~~~~~~~~~~~
postmen.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
postmen.cpp:44:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~

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