Pagini recente » Cod sursa (job #377326) | Cod sursa (job #1601443) | Cod sursa (job #472970) | Cod sursa (job #3143453) | Cod sursa (job #3274719)
#include<fstream>
#include<queue>
#include<vector>
using namespace std;
int v[100001];
vector <int> graf[100001];
void bfs(int s){
queue<int> q;
q.push(s);
while(!q.empty()){
int front=q.front();
for(int vecin:graf[front]){
if(v[vecin]==-1){
v[vecin]=v[front]+1;
q.push(vecin);
}
}
q.pop();
}
}
int main(){
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, s, x, y;
fin>>n>>m>>s;
for(int i=0; i<m; i++){
fin>>x>>y;
graf[x].push_back(y);
}
for(int i=1; i<=n; i++)
v[i]=-1;
v[s]=0;
bfs (s);
for(int i=1; i<=n; i++)
fout<<v[i]<<" ";
return 0;
}