Pagini recente » Istoria paginii runda/shiggydiggy123/clasament | Cod sursa (job #483598) | Cod sursa (job #2437582) | Cod sursa (job #2823638) | Cod sursa (job #3242669)
#include <bits/stdc++.h>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
const int NMAX=1e5;
const int INF=1e9;
vector<int> G[NMAX+1];
int vis[NMAX+1];
int d[NMAX+1];
queue<int> q;
int n,m,start;
void bfs(int start)
{
for(int i=1;i<=n;i++)
{
d[i]=INF;
}
d[start]=0;
q.push(start);
vis[start]=1;
while(!q.empty())
{
int node=q.front();
q.pop();
for(int i=0;i<G[node].size();i++)
{
int vecin=G[node][i];
if(vis[vecin]==0&&d[vecin]>d[node]+1)
{
vis[vecin]=1;
d[vecin]=d[node]+1;
q.push(vecin);
}
}
}
}
int main()
{
f>>n>>m>>start;
for(int i=1;i<=m;i++)
{
int x,y;
f>>x>>y;
G[x].push_back(y);
}
bfs(start);
for(int i=1;i<=n;i++)
{
if(d[i]==INF)
g<<"-1"<<" ";
else
g<<d[i]<<" ";
}
return 0;
}