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addTwoNumber.cpp
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34 lines (32 loc) · 764 Bytes
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/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
ListNode* result = new ListNode(0);
int carry = 0;
ListNode* lastNode = result;
do {
int sum = carry;
if(l1){
sum += l1->val;
l1 = l1 -> next;
}
if(l2){
sum += l2->val;
l2 = l2 -> next;
}
lastNode -> next = new ListNode(sum % 10);
carry = sum / 10;
lastNode = lastNode -> next;
} while(l1 || l2 || carry);
return result -> next;
}
};
reviewed.