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Cod sursa(job #779584)
#include <fstream>
#include <vector>
#include <queue>
#define MAXN 100005
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n,m,s,x,y,d,dist[MAXN];
vector<int> G[MAXN];
queue<int> q;
bool uz[MAXN];
int main()
{
int i;
f>>n>>m>>s;
for(i=1;i<=m;i++){
f>>x>>y;
G[x].push_back(y);}
uz[s]=1;
q.push(s);
while(!q.empty()){
x=q.front();
q.pop();
d=dist[x];
for(i=0;i<G[x].size();i++)
if(!uz[G[x][i]]){
uz[G[x][i]]=1;
dist[G[x][i]]=d+1;
q.push(G[x][i]);}}
for(i=1;i<=n;i++){
if(uz[i])
g<<dist[i]<<' ';
else
g<<"-1 ";}
f.close();
g.close();
return 0;
}