leetcode-Remove Duplicates from Sorted List II
2014-06-24 14:26
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Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
For example,
Given
Given
思路:双指针,与-Remove Duplicates from Sorted List类似,只是需要注意细节
代码:
ListNode *deleteDuplicates(ListNode *head) {
if(head == NULL) return head;
ListNode *pre=NULL;
ListNode *p=head;
ListNode *q=p->next;
if(q == NULL) return head;
while(p!=NULL && q!=NULL)
{
if(p->val == q->val)
{
q=q->next;
}
else
{
if(pre == NULL)
{
if(p->next != q)
{
head=q;
p=head;
q=q->next;
pre=NULL;
}
else
{
pre=p;
p=q;
q=q->next;
}
}
else
{
if(p->next != q)
{
pre->next=q;
p=q;
q=q->next;
}
else
{
pre=p;
p=q;
q=q->next;
}
}
}
}
if(p->next == q)
{
return head;
}
else
{
if(pre == NULL)
{
return pre;
}
else
{
pre->next=NULL;
}
}
return head;
}
For example,
Given
1->2->3->3->4->4->5, return
1->2->5.
Given
1->1->1->2->3, return
2->3.
思路:双指针,与-Remove Duplicates from Sorted List类似,只是需要注意细节
代码:
ListNode *deleteDuplicates(ListNode *head) {
if(head == NULL) return head;
ListNode *pre=NULL;
ListNode *p=head;
ListNode *q=p->next;
if(q == NULL) return head;
while(p!=NULL && q!=NULL)
{
if(p->val == q->val)
{
q=q->next;
}
else
{
if(pre == NULL)
{
if(p->next != q)
{
head=q;
p=head;
q=q->next;
pre=NULL;
}
else
{
pre=p;
p=q;
q=q->next;
}
}
else
{
if(p->next != q)
{
pre->next=q;
p=q;
q=q->next;
}
else
{
pre=p;
p=q;
q=q->next;
}
}
}
}
if(p->next == q)
{
return head;
}
else
{
if(pre == NULL)
{
return pre;
}
else
{
pre->next=NULL;
}
}
return head;
}
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