#include <iostream.h>
#include <vector>
using namespace std;
vector <int> a[30001];

.....

a[y].push_back(x);

.....

m=a[i].size();

....

Although that you ain't giving your whole source I think the problem is here. It should be
vector <int> a(30001) , not a[30001]

ok a(30001)
and then how to push_back
my email is stanislav_ognqnov@abv.bg

Edited by author 02.08.2006 20:57