Pagini recente » Cod sursa (job #2477483) | Cod sursa (job #2249924) | Cod sursa (job #2390831) | Cod sursa (job #1016866) | Cod sursa (job #2673444)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector <int> G[100005];
queue <int> Coada;
int viz[100005],n,m,s,x,y;
void BFS()
{
while(!Coada.empty())
{
int nod_curent=Coada.front();
Coada.pop();
for(vector<int>::iterator nod_vecin=G[nod_curent].begin(); nod_vecin!=G[nod_curent].end(); ++nod_vecin)
if(!viz[*nod_vecin])
{
viz[*nod_vecin]=viz[nod_curent]+1;
Coada.push(*nod_vecin);
}
}
}
int main()
{
f>>n>>m>>s;
while(f>>x>>y)
G[x].push_back(y);
viz[s]=1;
Coada.push(s);
BFS();
for(int i=1; i<=n; i++)
{
if(!viz[i])
g<<-1<<" ";
else
{
if(i==s)
g<<0<<" ";
else
g<<viz[i]-1<<" ";
}
}
return 0;
}