Reverse a linked list

Question

Anonymous · Accepted Answer

There's quite an extended back and forth in actual interviews for questions like this, so nothing quite like real practice.


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Anonymous · Answer

C++:

struct node {
    int datum;
    node * next;
}

void reverse(node **head) {
    node * previous = nullptr;
    node * current = head;
    node * next = nullptr;

    while(current != nullptr) {
        next = current->next;
        current->next = previous;
        previous = current;
        current = next;
    }
    
    *head = previous;
}

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