JuniorTheoryCommon

What happens when this program runs?

C++

#include <iostream>

int main() {
    int* p = new int{42};
    int* q = p;
    delete q;
    std::cout << *p << '\n';
}

Undefined behavior: p and q hold one address, and its int was deleted

Expecting p to keep its own int: q = p copies the address, not the int, so delete q destroys the only int and *p reads a deleted object.
Expecting a guaranteed crash: reading after delete is undefined behavior, and the standard promises no crash or any other outcome.

JuniorTheoryCommon

C++

#include <iostream>

int main() {
    int* p = new int{42};
    int* q = p;
    delete q;
    std::cout << *p << '\n';
}

Undefined behavior: p and q hold one address, and its int was deleted

Expecting p to keep its own int: q = p copies the address, not the int, so delete q destroys the only int and *p reads a deleted object.
Expecting a guaranteed crash: reading after delete is undefined behavior, and the standard promises no crash or any other outcome.