Q1. What is the difference between a pointer and a reference?
A pointer is a variable that stores an address. It can be null, reassigned and used with pointer arithmetic. A reference is an alias for an existing object: it must be in...
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Q2. Reverse a linked list iteratively and recursively.
Iterative (O(n) time, O(1) space): ```python def reverse(head): prev = None while head: nxt = head.next head.next = prev prev = head head = nxt return prev ``` Recursive ...
Q3. When should you use unique_ptr, shared_ptr or weak_ptr?
Raw `new` and `delete` are error-prone, so C++11 introduced smart pointers in `` that express ownership. - `std::unique_ptr`: exclusive ownership, cannot be copied, is mo...
Q4. What is the difference between value receivers and pointer receivers?
A method receiver can be a value (`func (u User) Name() string`) or a pointer (`func (u *User) SetName(n string)`). - A value receiver operates on a copy, so it cannot mu...