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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 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1->1->2->3, return 2->3.
class Solution { public: ListNode *deleteDuplicates(ListNode *head) { if(!head) return head; ListNode *previous = NULL; ListNode *current = head; bool repeat = false; while(current) { while(current->next && current->val == current->next->val) { current = current->next; repeat = true; } if(repeat && previous!= NULL) { previous->next = current->next; } else if(!repeat) { if(!previous) head = current; previous = current; } current = current->next; repeat = false; } if(!previous) return previous; return head; } };
82. Remove Duplicates from Sorted List II (List)
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原文地址：http://www.cnblogs.com/qionglouyuyu/p/4853199.html
