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reverseLink.cpp
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reverseLink.cpp
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#include <iostream>
struct ListNode {
int key;
ListNode* p_Next;
};
ListNode* reverseList(ListNode* head) {
if (head == nullptr)
return nullptr;
ListNode* prev = nullptr;
ListNode* cur = head;
while (cur != nullptr) {
ListNode* next = cur->p_Next;
cur->p_Next = prev;
prev = cur;
cur = next;
}
return prev;
}
void printList(ListNode* head) {
ListNode* cur = head;
while (cur != nullptr) {
std::cout << cur->key << " ";
cur = cur->p_Next;
}
std::cout << std::endl;
}
int main() {
ListNode* head = new ListNode();
ListNode* cur = head;
for (int i = 0; i < 8; i++) {
cur->key = i;
cur->p_Next = new ListNode();
cur = cur->p_Next;
}
cur->p_Next = nullptr;
cur->key = 9;
printList(head);
ListNode* new_head = reverseList(head);
printList(new_head);
return 0;
}