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Cod sursa(job #540878)
// PARCURGERE IN LATIME
#include<fstream>
#include<vector>
using namespace std;
#define Nmax 100001
vector<int> G[Nmax];
long n, m, s, cost[Nmax],c[Nmax];
void citire()
{
int i, x, y;
ifstream f("bfs.in");
f>>n>>m>>s;
for(i=1;i<=m;i++)
{
f>>x>>y;
G[x].push_back(y);
}
f.close();
for(i=1;i<=n;i++)
cost[i]=-1;
}
void bfs(int nod)
{
int i, vecini,li=1,ls=1;
c[li]=nod; cost[nod]=0;
while(li<=ls)
{
vecini=G[c[li]].size();
for(i=0;i<vecini;i++)
if(cost[G[c[li]][i]]==-1)
{
ls++;
c[ls]=G[c[li]][i];
cost[c[ls]]=cost[c[li]]+1;
}
li++;
}
}
void afisare()
{
int i;
ofstream g("bfs.out");
for(i=1;i<=n;i++)
g<<cost[i]<<" ";
g.close();
}
int main()
{
citire();
bfs(s);
afisare();
return 0;
}