Submission #25994

#	Time	Username	Problem	Language	Result	Execution time	Memory
25994		H_H	Senior Postmen (BOI14_postmen)	C++14	55 / 100	564 ms	55520 KiB

postmen

#include <bits/stdc++.h>
using namespace std;

const int MAXN=500005;
bool vis[MAXN];
bool vs[MAXN];
vector<pair<int,int> >adj[MAXN];
int n,m;

int cyc=-1;

void dfs(int x)
{
	vis[x]=true;

	while(!adj[x].empty())
	{
		int y=adj[x].back().first;
		int in=adj[x].back().second;
		if(vs[in])
		{
			adj[x].pop_back();
			continue;
		}
		adj[x].pop_back();
		vs[in]=true;
		if(vis[y])
		{
			printf("%d",x);
			cyc=y;
			break;
		}
		dfs(y);
		if(cyc!=-1)
		{
			printf(" %d",x);
			if(cyc==x)
			{
				printf("\n");
				cyc=-1;
			}
			else break;
		}
	}

	vis[x]=false;
}
int main()
{
	scanf("%d%d",&n,&m);
	for(int i=0;i<m;i++)
	{
		int x,y;
		scanf("%d%d",&x,&y);
		adj[x].push_back({y,i});
		adj[y].push_back({x,i});
	}
	
	for(int i=1;i<=n;i++)dfs(i);	
	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
postmen.cpp:54:8: 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: 17 / 17
• Subtask 3: 0 / 45