Submission #231032

#	Time	Username	Problem	Language	Result	Execution time	Memory
231032		Pajaraja	Senior Postmen (BOI14_postmen)	C++17	100 / 100	500 ms	46504 KiB

postmen

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
vector<long long> g[500007];
int dk[500007];
stack<int> st,sk;
bool vi[500007],vig[500007];
inline void euler(int s)
{
	while(dk[s]<g[s].size())
	{
		if(!vig[g[s][dk[s]]>>32LL])
		{
			vig[g[s][dk[s]]>>32LL]=true;
			euler(g[s][dk[s]++]&((1LL<<32LL)-1));
		}
		else dk[s]++;
	}
	st.push(s);
}
int main()
{
	int n,m;
	scanf("%d%d",&n,&m);
	for(int i=0;i<m;i++)
	{
		int t1,t2;
		scanf("%d%d",&t1,&t2);
		g[t1].push_back(t2+(((long long)i)<<32LL));
		g[t2].push_back(t1+(((long long)i)<<32LL));
	}
	euler(1);
	for(int i=0;i<m+1;i++)
	{
		int x=st.top();
		st.pop();
		if(vi[x])
		{
			while(true)
			{
				int y=sk.top();
				printf("%d ",y);
				sk.pop();
				vi[y]=false;
				if(y==x) break;
			}
			printf("\n");
		}
		sk.push(x);
		vi[x]=true;
	}
}

Compilation message (stderr)

postmen.cpp: In function 'void euler(int)':
postmen.cpp:10:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(dk[s]<g[s].size())
        ~~~~~^~~~~~~~~~~~
postmen.cpp: In function 'int main()':
postmen.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
postmen.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&t1,&t2);
   ~~~~~^~~~~~~~~~~~~~~~

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