ARTS2 (Add Two Numbers)
Problem
You are given two non-empty linked lists representing two non-negative integers. 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.
You may assume the two numbers do not contain any leading zero, except the number 0 itself. Example:
'''
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Explanation: 342 + 465 = 807.
'''
Solution
Java Code:
'''
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode result = null;
ListNode preNode = null;
ListNode next1 = l1;
ListNode next2 = l2;
int remainder = 0;
int divisor = 0;
while (next1 != null || next2 != null) {
int num1 = 0;
if (next1 != null) {
num1 = next1.val;
next1 = next1.next;
}
int num2 = 0;
if (next2 != null) {
num2 = next2.val;
next2 = next2.next;
}
int sum = num1 + num2 + divisor;
divisor = sum / 10;
remainder = sum % 10;
if (result == null) {
result = new ListNode(remainder);
preNode = result;
} else {
ListNode tmpNode = new ListNode(remainder);
preNode.next = tmpNode;
preNode = tmpNode;
}
}
if (divisor != 0) {
ListNode tmpNode = new ListNode(divisor);
preNode.next = tmpNode;
}
return result;
}
} '''
Review
Last week I learned the baise knowledge of Java. Now I am doing some demo in Java. But must write some blog of the learning java, otherwise I will forget it soon, and I cannot find the knowledge that I learn before.
Technique
The visual code is a text editer , if I want create a project, I must integrate some other extentions .
