The subparts to this problem involve errors in the use ofpointers. a. this program is supposed to write 30 20 10, but it doesn't. find all ofthe bugs and show a fixed version of the program: int main() { intarr[3]={5,10,15}; int *ptr = arr; *ptr = 10; // set arr[0] to 10 *ptr + 1 = 20; // set arr[1] to 20 ptr +=2; ptr[0] = 30; // set arr[2] to 30 while (ptr > = arr) { ptr--; cout < < ' '< < *ptr; // print values } cout < endl; } b. the finddisorder function is supposed to find the first item in an array that is less than the element preceding it, and set the p parameter to point to that item, so the caller can know the location of that item. explain why this function won't do that, and show how to fix it. your fix must be to the function only; you must not change the the main routine below in any way, yet as a result of your fixing the function, the main routine below must work correctly. void finddisorder(int arr[], int n, int* p) { for(int k=1; k