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Cod sursa(job #719853)
#include <fstream>
#include <vector>
#include <queue>
#define nmax 100005
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n, m, sursa, d[nmax];
vector<int> gf[nmax];
queue<int> q;
void citeste(){
f >> n >> m >> sursa;
for(int i=1; i<=m; i++){
int x, y;
f >> x >> y;
gf[x].push_back(y);
}
}
void rezolva(){
for(int i=0; i<nmax-1; i++) d[i] = (1<<30);
d[sursa] = 0;
q.push(sursa);
for(; q.size(); ){
int nod = q.front();
q.pop();
for(int i=0; i<gf[nod].size(); i++){
//am graf orientat ,nu am nevoie de vector de vizitati
if (d[gf[nod][i]] == (1<<30)){
d[gf[nod][i]] = d[nod] + 1;
q.push(gf[nod][i]);
}
}
}
}
void scrie(){
for(int i=1; i<=n; i++)
if (d[i] == (1<<30)) g << "-1" << " ";
else g << d[i] << " ";
}
int main(){
citeste();
rezolva();
scrie();
f.close();
g.close();
return 0;
}