Pagini recente » Cod sursa (job #648580) | Cod sursa (job #534683) | Cod sursa (job #2215799) | Cod sursa (job #2967941) | Cod sursa (job #2185595)
#include <iostream>
#include <fstream>
#include <vector>
#include <deque>
#define NMAX 100005
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
bool viz[NMAX];
int n,m,s,dist[NMAX];
vector <int> a[NMAX];
deque <int> coada;
void read()
{
f>>n>>m>>s;
for(int i=1;i<=m;i++)
{
int x,y;
f>>x>>y;
a[x].push_back(y);
}
f.close();
}
void bfs()
{
for(int i=1;i<=n;i++)dist[i]=-1;
coada.push_back(s);
viz[s]=1;
dist[s]=0;
while(!coada.empty())
{
int p=coada.front();
for(int i=0;i<a[p].size();i++)
if(viz[a[p][i]]==0)
{
viz[a[p][i]]=1;
coada.push_back(a[p][i]);
dist[a[p][i]]=dist[p]+1;
}
coada.pop_front();
++p;
}
for(int i=1;i<=n;i++)
g<<dist[i]<<" ";
g<<'\n';
}
int main()
{
read();
bfs();
return 0;
}