C++

1. A?B?C?D? which one is correct

2.

3A, 3B

#include using namespace std; void swap0(int* ptri, int* ptr2) { int *temp; temp = ptr1; ptr1 = ptr2; ptr2 = temp; void swap1(int ptri, int ptr2){ int temp; temp = ptri; ptr1 = ptr2; ptr2 = temp; portion void swap2(int *&ptri, int *&ptr2){ int* temp; temp = ptr1; ptr1 = ptr2; ptr2 = temp; void swap3(int &ptri, int &ptr2) { int temp; temp = ptr1; ptr1 = ptr2; ptr2 = temp; int main({ int *ptr1 = new int[5]; int *ptr2 = new int[5]; for (int i = 0; i A[i+1]) { // swap here if A[i] > A[i+1] temp = A[i]; A[i] = A[i+1]; A[i + 1] = temp; Select one: At most n swaps need to be done in the whole process; After iterating the first outer loop, the largest number can always be fixed; At least one swap needs to be done in the whole process; If there are duplicates in some array, Bubble sort cannot work on it; 600 vu WNP #include int* foo(int x){ int z = x*x; std::cout