Code passes system test on arena, but fails with topcoditor

[shivshnkr]

Most of us are addicted to using global variables, and arrays and also assign it value at global scope. Such codes give an incorrect response when using topcoditor.

Example: Find the minimum element in an vector a;

#include <iostream>
using namespace std;

int glo = 1e9;

class FindMin {
    int getMin(vector <int> a)
    {
          int n = a.size();
          for (int i = 0; i < n; i++) {
              glo = min (glo, a[i]);
          }
          return glo;
    }
};

Such a code passes system test on Topcoder arena practice rooms, but fails here.