题目描述
输入两个单调递增的链表,输出两个链表合成后的链表,当然我们需要合成后的链表满足单调不减规则。
解题思路
/*
struct ListNode {
int val;
struct ListNode *next;
ListNode(int x) :
val(x), next(NULL) {
}
};*/
class Solution {
public:
ListNode* Merge(ListNode* pHead1, ListNode* pHead2)
{
ListNode* newHead = new ListNode(-1);
ListNode* p = newHead;
while(pHead1!=NULL&&pHead2!=NULL){
if(pHead1->val<=pHead2->val){
p->next = pHead1;
p=p->next;
pHead1=pHead1->next;
}else{
p->next = pHead2;
p = p->next;
pHead2 = pHead2->next;
}
}
if(pHead1!=NULL)
p->next=pHead1;
if(pHead2!=NULL)
p->next=pHead2;
return newHead->next;
}
};