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Cod sursa(job #645330)
#include<cstdio>
#include<vector>
#include<queue>
using namespace std;
const int N=100010;
int n,m,s,x,y,d[100010];
vector<int> a[N];
void read()
{
int i;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
while(m--)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
for(i=1;i<=n;i++)
d[i]=-1;
}
void bfs()
{
queue<int> q;
q.push(s);
d[s]=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)
{
d[y]=1+d[x];
q.push(y);
}
}
}
}
void rez()
{
bfs();
int i;
for(i=1;i<=n;i++)
printf("%d ",d[i]);
printf("\n");
}
int main()
{
read();
rez();
return 0;
}