Mai intai trebuie sa te autentifici.
Cod sursa(job #2152880)
Utilizator | Data | 5 martie 2018 20:48:34 | |
---|---|---|---|
Problema | BFS - Parcurgere in latime | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.74 kb |
#include <fstream>
#include <vector>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int n,m,s,x,y,i,c[100010],v[100010];
vector<int> a[100010];
void bfs (int s) {
int p=1,u=1;
v[s]=1;
c[1]=s;
while(p<=u){
int nod=c[p];
for(int i=0;i<a[nod].size();i++){
int vecin=a[nod][i];
if(v[vecin]==0){
v[vecin]=v[nod]+1;
c[++u]=vecin;
}
}
p++;
}
}
int main () {
fin>>n>>m>>s;
for(i=1;i<=m;i++){
fin>>x>>y;
a[x].push_back(y);
}
bfs(s);
for(i=1;i<=n;i++)
if(v[i]>0)
fout<<v[i]-1<<" ";
else
fout<<-1<<" ";
}