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Cod sursa(job #704245)
#include<cstdio>
#include<vector>
#include<queue>
using namespace std;
const int N = 100099;
vector <int> a[N];
queue <int> q;
int x0,d[N],n;
void citire()
{
int x,y,m,i;
scanf("%d%d%d",&n,&m,&x0);
for(i=1;i<=m;i++)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
}
void init()
{
for(int i=1;i<=n;i++)
d[i]=-1;
}
void afisare()
{
for (int i=1;i<=n;i++)
printf("%d ",d[i]);
}
void bfs(int x0)
{
int x,y;
q.push(x0);
d[x0]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(size_t i=0; i<a[x].size();i++)
{
y=a[x][i];
if(d[y]==-1)
{
q.push(y);
d[y]=1+d[x];
}
}
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
citire();
init();
bfs(x0);
afisare();
return 0;
}