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0002-add-two-numbers.java

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/*

Name - Add Two Numbers

Link - https://leetcode.com/problems/add-two-numbers/

Time Complexity - O(m + n)

Space Complexity - o(1)

Note - make use of modulo (get remainder) and division (get quotient)

*/

class Solution {

public ListNode addTwoNumbers(ListNode first, ListNode second) {

int q = 0;

int r = 0;

int sum = 0;

ListNode head = null;

ListNode temp = null;

while (first != null || second != null || q>0) {

sum =

q +

(

((first != null) ? first.val : 0) +

((second != null) ? second.val : 0)

);

r = sum % 10;

q = sum / 10;

ListNode newNode = new ListNode(r);

if (head == null) {

head = newNode;

} else {

temp = head;

while (temp.next != null) {

temp = temp.next;

}

temp.next = newNode;

newNode.next = null;

}

if (first != null) {

first = first.next;

}

if (second != null) {

second = second.next;

}

}

return head;

}

}