两个升序链表的合并 Merge Two Sorted Lists 【 leetcode】
class Solution {
public:
ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {
ListNode *p;
ListNode *p1=p;
while(l1!=NULL && l2!=NULL){
if((l1->val)<(l2->val)){
p->next=l1;
p=p->next;
l1=l1->next;
}
else{
p->next=l2;
p=p->next;
l2=l2->next;
}
}
if(!l1) p->next=l2;
if(l2==NULL) p->next=l1;
return p1->next;
}
};
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