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2. Add Two Numbers.cpp
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2. Add Two Numbers.cpp
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//
// Created by bhc on 2022/2/11.
//
struct ListNode {
int val;
ListNode *next;
ListNode() : val(0), next(nullptr) {}
ListNode(int x) : val(x), next(nullptr) {}
ListNode(int x, ListNode *next) : val(x), next(next) {}
};
class Solution {
public:
ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
if(!l1){
return l2;
}
int cout=0;
ListNode * head=l1;
ListNode * curr=l1;
ListNode * tail;
ListNode * newHead;
while(curr){
curr->val=curr->val+(l2?l2->val:0);
if(!curr->next){
curr->next=l2?l2->next:nullptr;
break;
}
curr=curr->next;
l2=l2?l2->next:nullptr;
}
curr=head;
while(curr){
int tmp=(curr->val+cout)>=10;
curr->val=(curr->val+cout)%10;
cout=tmp;
if(curr->next){
curr=curr->next;
}
else{
if(cout==1){
curr->next=new ListNode(1);
}
break;
}
}
return head;
}
};