leetcode 21. Merge Two Sorted Lists
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没有加新的链表，而是在原有的链表基础上进行next的修改。
ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) { ListNode * ret = NULL , *p = NULL; if(l1 == NULL)return ret = l2; if(l2 == NULL)return ret = l1; if(l2->val<l1->val){ ret = l2; l2 = l2->next; }else{ ret = l1; l1 = l1->next; } p = ret; while(l1!= NULL && l2!=NULL){ if(l1->val<l2->val){ p->next = l1; l1 = l1->next; p = p->next; }else{ p->next = l2; l2 = l2->next; p = p->next; } } if(l1 == NULL)p->next = l2; else p->next = l1; return ret;} 0 0
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