View Compilation Error

0_0_27464295_26589.cpp: In function 'int main()':
0_0_27464295_26589.cpp:51:108: error: cannot convert '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' to 'int' for argument '5' to 'void change(int, int, int&, int, int)'
   for (int i = 1; i <= n; i++) change(1, n, root[i], root[i - 1], lower_bound(v.begin(), v.end(), a[i]) + 1);
                                                                                                            ^