Pagini recente » Cod sursa (job #1656192) | Cod sursa (job #2452571) | Cod sursa (job #1256614) | Cod sursa (job #1729621) | Cod sursa (job #1519398)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
const int maxn=100005;
int n,m,s,dist[maxn];
vector <int> g[maxn];
void bfs(int st)
{
for(int i=1;i<=n;i++)
dist[i]=-1;
/// echivalenta cu memset (dist,-1,sizeof(dist));
queue <int > q;
dist[st]=0;
q.push(st);
while(!q.empty())
{
int node = q.front();
q.pop();
for(int i=0; i<int (g[node].size()); i++)
{
int vecin = g[node][i];
if(dist[vecin]== -1)
{
dist[vecin] = dist[node] +1;
q.push (vecin);
}
}
}
}
int main()
{
ifstream fin("bfs.in");
ofstream fout("bfs.out");
fin>>n>>m>>s;
for(int i=1;i<=m;i++)
{
int x,y;
fin>>x>>y;
g[x].push_back(y); /// x->y
}
bfs(s);
for(int i=1;i<=n;i++)
fout<<dist[i]<<" ";
return 0;
}