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Add Two Numbers.cpp
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Add Two Numbers.cpp
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#include <iostream>
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) {
ListNode dummy;
ListNode *cur = &dummy;
bool carry = false;
while (l1 || l2) {
int res = 0;
if (l1) {
res += l1->val;
}
if (l2) {
res += l2->val;
}
if (carry) {
res += 1;
}
carry = false;
if (res > 9) {
res -= 10;
carry = true;
}
if (l1)
l1 = l1->next;
if (l2)
l2 = l2->next;
cur->next = new ListNode(res);
cur = cur->next;
}
if (carry) {
cur->next = new ListNode(1);
}
return dummy.next;
}
};