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Cod sursa(job #625380)
#include<fstream>
using namespace std;
#define IN "bfs.in"
#define OUT "bfs.out"
fstream f(IN, ios::in), g(OUT, ios::out);
bool a[40001][40001];
int v[100001], i, n, m, pornire, x, y;
void bfs(int v[100001], int start)
{
int k, p, u, coada[100001];
for(i=1; i<=n; i++)
coada[i]=0;
v[start]=0;
coada[1]=start;
p=u=1;
while(p<=u)
{
for(k=n; k>=1; k--)
{
if(a[coada[p]][k]==1 && v[k]==0 && k!=start)
{
u++;
coada[u]=k;
v[k]=v[coada[p]]+1;
}
}
p++;
}
}
int main()
{
f>>n>>m>>pornire;
for(i=1; i<=m; i++)
{
f>>x>>y;
a[x][y]=1;
}
bfs(v, pornire);
v[pornire]=0;
for(i=1; i<=n; i++)
{
if(v[i]==0 && i!=pornire) g<<"-1 ";
else g<<v[i]<<" ";
}
return 0;
}