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Java Solution for LeetCode algorithm problems, continually updating
package g0001_0100.s0002_add_two_numbers;
// #Medium #Top_100_Liked_Questions #Top_Interview_Questions #Math #Linked_List #Recursion
import com_github_leetcode.ListNode;
/*
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode dummyHead = new ListNode(0);
ListNode p = l1;
ListNode q = l2;
ListNode curr = dummyHead;
int carry = 0;
while (p != null || q != null) {
int x = (p != null) ? p.val : 0;
int y = (q != null) ? q.val : 0;
int sum = carry + x + y;
carry = sum / 10;
curr.next = new ListNode(sum % 10);
curr = curr.next;
if (p != null) {
p = p.next;
}
if (q != null) {
q = q.next;
}
}
if (carry > 0) {
curr.next = new ListNode(carry);
}
return dummyHead.next;
}
}