Submission #171522

#	Time	Username	Problem	Language	Result	Execution time	Memory
171522		TadijaSebez	007 (CEOI14_007)	C++11	0 / 100	320 ms	23672 KiB

007

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=200050;
vector<int> E[N];
void BFS(int x, int n, int d[])
{
	for(int i=1;i<=n;i++) d[i]=-1;
	queue<int> q;
	q.push(x);
	d[x]=0;
	while(q.size())
	{
		int u=q.front();
		q.pop();
		for(int v:E[u]) if(d[v]==-1)
		{
			d[v]=d[u]+1;
			q.push(v);
		}
	}
}
int ds[N],dd[N];
int main()
{
	int n,m,s,d,a,b;
	scanf("%i %i",&n,&m);
	scanf("%i %i %i %i",&s,&d,&a,&b);
	for(int i=1,u,v;i<=m;i++) scanf("%i %i",&u,&v),E[u].pb(v),E[v].pb(u);
	BFS(s,n,ds);
	BFS(d,n,dd);
	//printf("%i %i %i %i\n",ds[a],ds[b],dd[a],dd[b]);
	int ans=min(dd[a]-ds[a],dd[b]-ds[b]);
	ans=max(ans,-1);
	printf("%i\n",ans);
	return 0;
}

Compilation message (stderr)

007.cpp: In function 'int main()':
007.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
007.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i %i %i",&s,&d,&a,&b);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:29:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1,u,v;i<=m;i++) scanf("%i %i",&u,&v),E[u].pb(v),E[v].pb(u);
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70