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Cod sursa(job #885965)
#include<fstream>
#include<vector>
#include<queue>
#define maxN 100000
using namespace std;
int N,M,S;
vector<int> Viz;
vector<vector<int> > V;
queue<int> Q;
ifstream f("bfs.in");
ofstream g("bfs.out");
void citire(){
int x,y;
f>>N>>M>>S;
Viz.resize(N+1);
V.resize(N+1);
for(int i=1;i<=M;i++){
f>>x>>y;
V[x].push_back(y);
}
for(int i=1;i<=N;i++)
Viz[i]=-1;
}
void parcurgereLatime(){
while(!Q.empty()){
int nod=Q.front();
Q.pop();
for(vector<int>::iterator it=V[nod].begin();it!=V[nod].end();it++)
if(Viz[*it]==-1){
Q.push(*it);
Viz[*it]=Viz[nod]+1;
}
}
}
void afisare(){
for(int i=1;i<=N;i++)
g<<Viz[i]<<' ';
}
int main(){
citire();
Viz[S]=0;
Q.push(S);
parcurgereLatime();
afisare();
return 0;
}