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Cod sursa(job #680543)
#include<fstream>
#include<list>
#include<stdio.h>
using namespace std;
#define IN "bfs.in"
#define OUT "bfs.out"
#define MaxN 100050
fstream f(IN, ios::in), g(OUT, ios::out);
list<long> a[MaxN];
list<long>::iterator it;
int x, y, n, m, i, cnt=0;
int viz[MaxN], s;
void BFS(int start)
{
int p, u, coada[MaxN];
p=u=1;
coada[1]=start;
viz[start]=0;
while(p<=u)
{
for(it=a[start].begin(); it!=a[start].end(); it++)
{
if(viz[*it]==-1)
{
viz[*it]=viz[start]+1;
u++;
coada[u]=*it;
}
}
p++;
start=coada[p];
}
}
int main()
{
f>>n>>m>>s;
for(i=1; i<=m; i++)
{
f>>x>>y;
if(x!=y)
a[x].push_back(y);
}
for(i=1; i<=n; i++)
viz[i]=-1;
BFS(s);
for(i=1; i<=n; i++)
g<<viz[i]<<" ";
return 0;
}