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Cod sursa(job #411667)
#include<cstdio>
#include<fstream>
#include<iostream>
#include<vector>
#include<ctime>
#include<cstdlib>
#define MAX 100005
using namespace std;
vector <int> d,G[MAX];
int n;
void bfs(int sursa)
{
vector<int> coada;
int st,dr;
coada.push_back(sursa);
d[sursa]=0;
st=dr=0;
while(st<=dr)
{
int k=coada[st++];
for(int i=1;i<G[k].size();i++)
{
int vecin=G[k][i];
if(d[vecin]==-1 || d[vecin]>d[k]+1)
{
d[vecin]=d[k]+1;
coada.push_back(vecin);
dr++;
}
}
}
}
void dfs(int varf)
{
for(int i=1;i<G[varf].size();i++)
{
int vecin=G[varf][i];
if(d[vecin]==-1 || d[vecin]>d[varf]+1)
{
d[vecin]=d[varf]+1;
dfs(vecin);
}
}
}
int main()
{
int m,s,i,j;
ifstream fin("bfs.in");
freopen("bfs.out","w",stdout);
fin>>n>>m>>s;
d.assign(n+1,-1);
for(i=1;i<=n;i++)
G[i].push_back(0);
for(i=1;i<=m;i++)
{
int x,y;
fin>>x>>y;
G[x].push_back(y);
}
srand(time(NULL));
d[s]=0;
int ce=rand()%2;
if(ce==1)
bfs(s);
else
bfs(s);
for(i=1;i<=n;i++)
printf("%d ", d[i]);
return 0;
}