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Cod sursa(job #628844)
#include <stdio.h>
#include <queue>
#include <vector>
using namespace std;
vector<int> v[100001];
queue <int> q;
FILE *fin,*fout;
int n,m,s,tata[100001],d[100001];
void citire()
{
int x,y;
fin=fopen("bfs.in","r");
fscanf(fin,"%d %d %d",&n,&m,&s);
for(int i=0;i<m;i++)
{
fscanf(fin,"%d %d",&x,&y);
v[x].push_back(y);
}
}
void parcurgere(int s)
{
bool viz[100001];
int u;
for(int i=1;i<=n;i++)
{
viz[i]=0;
tata[i]=0;
}
q.push(s);
viz[s]=1;
d[s]=0;
while(!q.empty())
{
u=q.front();
for(vector<int>::iterator it=v[u].begin();it!=v[u].end();it++)
{
if(viz[*it]==0){
q.push(*it);
viz[*it]=1;
tata[*it]=u;
d[*it]=d[u]+1;
}
}
q.pop();
}
}
void afisare()
{
fout=fopen("bfs.out","w");
for(int i=1;i<=n;i++)
{
if(d[i]==0 && i!=s)
{
fprintf(fout,"-1 ");
}
else
{
fprintf(fout,"%d ",d[i]);
}
}
}
int main()
{
citire();
parcurgere(s);
afisare();
return 0;
}