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Write a function in c plus plus to reverse a linked list without using more than constant of extra space?
assuming a circular, doubly linked list that uses its
head pointer as a sentinel (no data is stored in the
head).
#define PTR_SWAP(a, b) \
do { \
const void* t = a; a = b; b = (void*)t; \
} while (0)
void
listReverse(list_type* list) {
node_type* node = list->head;
do {
PTR_SWAP(node->prev, node->next);
node = node->prev;
} while (node != list->head);
}
What else can I help you with?
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