002 - Add Two Numbers

Add Two Numbers

Total Accepted:
100874Total Submissions:
477557Difficulty: Medium

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

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其实就是两个大整数高低位倒置相加

 

/**
* Definition for singly-linked list.
* struct ListNode {
*     int val;
*     struct ListNode *next;
* };
*/
struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2)
{
int jin = 0;
struct ListNode* ll = l1;
struct ListNode* lr = l2;
while (l1) {
l1->val += jin;
jin = 0;
if (l2) {
l1->val += l2->val;
l2 = l2->next;
}
if (l1->val > 9) {
jin = 1;
l1->val -= 10;
}

if (!l1->next) {
if (!l2) {
if (jin) {
lr->val = jin;
l1->next = lr;
lr->next = NULL;
l1 = lr;
}
} else {
l1->next = l2;
l2 = NULL;
}
}
l1 = l1->next;
}

return ll;
}