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Cod sursa(job #953188)
#include <fstream>
#include <list>
#define DIMN 100010
using namespace std;
list<int> L[DIMN];
int c[DIMN];
int v[DIMN];
int n,m,s,i,x,y;
void bfs(int x) {
int first;
int p = 1;
int u = 1;
c[p] = x;
v[x] = 1;
while (p<=u) {
// punem in coada vecinii lui c[p];
first = c[p];
for (list<int>::iterator it = L[first].begin(); it!=L[first].end(); it++) {
if (v[*it] == 0) {
u++;
c[u] = *it;
v[*it] = v[first] + 1;
}
}
p++;
}
}
int main() {
ifstream fin("bfs.in");
ofstream fout("bfs.out");
fin>>n>>m>>s;
for (i=1;i<=m;i++) {
fin>>x>>y;
L[x].push_back(y);
}
bfs(s);
for (i=1;i<=n;i++)
fout<<v[i]-1<<" ";
fout<<"\n";
return 0;
}