Pagini recente » Cod sursa (job #2303006) | Cod sursa (job #2785709) | Cod sursa (job #2841163) | Cod sursa (job #2413069) | Cod sursa (job #2049098)
#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> v[100010];
int n,m,s,l;
int vecini[100010],len[100010],q[100010];
void bfs(int start){
memset(len,-1,sizeof(len));
len[start]=0;
q[l++]=start;
for(int i=0;i<=l;i++){
for(int j=0;j<vecini[q[i]];j++){
if(len[v[q[i]][j]]==-1){
q[++l]=v[q[i]][j];
len[q[l]]=1+len[q[i]];
}
}
}
}
int main(){
int x,y;
fin>>n>>m>>s;
for(int i=1;i<=m;i++){
fin>>x>>y;
v[x].push_back(y);
}
for(int i=1;i<=n;i++)
vecini[i]=v[i].size();
bfs(s);
for(int i=1;i<=n;i++)
fout<<len[i]<<" ";
return 0;
}