code it should determine which value in the array occurs most often i write it by use two pointers of array but when i run it become error

Question

#include 
#include 
using namespace std; 
int f(int ptr[ ], int size) { int s = 0; int* ptr2 = new int[size]; for (int y = 0; y <= size - 1; y++) { ptr2[y] = 0;

} fo