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Cod sursa(job #799647)
#include <iostream>
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
const int n = 100001;
vector <int> v[n];
queue <int> q ;
int i,j,x,y,dist[n],M,N,S;
void citire(){
f>>N>>M>>S;
for (i=0;i<=M ;i++)
{
f>>x>>y;
v[x].push_back(y);
//v[i].push_back(x);
}
for( i=1;i<=N; i++)
{
dist[i]=-1;
}
}
void bfs()
{
int x, y;
q.push(S);
dist [S]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(size_t i=0;i<v[x].size();i++)
{
y=v[x][i];
if(dist[y]==-1)
{
q.push(y);
dist[y]=1+dist[x];
}
}
}
}
void tipar ()
{
for( int i=1;i<=N;i++)
{
g<<dist[i]<<" ";
}
}
int main()
{
citire();
bfs();
tipar();
return 0;
}