this code doesn't execute in vs code ide but works easily on other editors. It doesn't show any error but simply does not work. What am i missing here? following is the code:
#include <iostream>
#include <climits>
using namespace std;
int main()
{
int n;
cin >> n;
int a[n];
for (int i = 0; i < n; i++)
{
cin >> a[i];
}
const int N=1000000;
int idx[N];
for (int i = 0; i < N; i++)
{
idx[i] = -1;
}
int minidx = INT_MAX;
for (int i = 0; i < n; i++)
{
if (idx[a[i]] != -1)
{
minidx = min(minidx, idx[a[i]]);
}
else
{
idx[a[i]] = i;
}
}
if (minidx == INT_MAX)
{
cout << "-1" << endl;
}
else
{
cout << minidx+1 << endl;
}
return 0;
}