翻转链表
ListNode* ReverseList(ListNode* head) {
ListNode* pre = nullptr;
ListNode* cur = head;
ListNode* next = nullptr;
while (cur)
{
next = cur->next;
cur->next = pre;
pre = cur;
cur = next;
}
return pre;
}
ListNode* pre = nullptr;
ListNode* cur = head;
ListNode* next = nullptr;
while (cur)
{
next = cur->next;
cur->next = pre;
pre = cur;
cur = next;
}
return pre;
}
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