Pagini recente » Cod sursa (job #681438) | Cod sursa (job #553735) | Cod sursa (job #1917539) | Cod sursa (job #1448637) | Cod sursa (job #1889342)
#include <fstream>
#include<queue>
#include<vector>
#define inf -100000
using namespace std;
ifstream fi("bfs.in");
ofstream fo("bfs.out");
vector <int> G[100005];
queue <int> q;
int dist[100005];
bool viz[100005];
int n, m, S;
void bfs(int start)
{
q.push(start);
viz[start]=1;
dist[start]=0;
int nod;
while(!q.empty())
{
nod=q.front();
q.pop();
for(auto it: G[nod])
if(!viz[it])
{
q.push(it);
viz[it]=true;
dist[it]=dist[nod]+1;
}
}
}
int main()
{
int x,y,i;
fi>>n>>m>>S;
for(i=1; i<=m; i++)
{
fi>>x>>y;
G[x].push_back(y);
}
for(i=1; i<=n; i++)
dist[i]=inf;
bfs(S);
for(i=1; i<=n; i++)
{
if(dist[i]==inf)
fo<<"-1"<<" ";
else
fo<<dist[i]<<" ";
}
fi.close();
fo.close();
}