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/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution
{
public:
ListNode *insertionSortList(ListNode *head)
{
if (head == NULL)
return head;
ListNode* curr = head -> next;
head -> next = NULL;
while(curr != NULL)
{
ListNode* tmpHead = head;
ListNode* prev = NULL;
ListNode* next = curr -> next;
while(tmpHead != NULL && tmpHead -> val <= curr -> val)
{
prev = tmpHead;
tmpHead = tmpHead -> next;
}
if(prev != NULL)
{
//insert
if(prev -> next)
{
curr -> next = prev -> next;
prev -> next = curr;
}
else
{
prev -> next = curr;
curr -> next = NULL;
}
}
else
{
curr -> next = head;
head = curr;
}
curr = next;
}
return head;
}
};
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