Pagini recente » Cod sursa (job #390747) | Cod sursa (job #1485678) | Cod sursa (job #2929766) | Cod sursa (job #2858691) | Cod sursa (job #962406)
Cod sursa(job #962406)
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
const int N = 100005;
int n,m,s,x,y,r;
int v[N];
vector<int> G[N];
queue<int> q;
int main(){
in>>n>>m>>s;
for(int i=1;i<=n;i++) v[i]=-1;
for(;m;--m){
in>>x>>y;
G[x].push_back(y);
}
q.push(s);
v[s]=0;
r=1;
while(!q.empty()){
x=q.front(); q.pop();
for(vector<int>::iterator it = G[x].begin(); it != G[x].end(); it++){
if(v[*it]==-1) q.push(*it);
if(v[*it]==-1 || v[*it]>v[x]+1) v[*it]=v[x]+1;
}
}
for(int i=1;i<=n;i++) out<<v[i]<<' ';
return 0;
}