Add Two Numbers

最新推荐文章于 2024-08-12 10:14:14 发布

转载最新推荐文章于 2024-08-12 10:14:14 发布 · 482 阅读

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本文介绍了一种解决两数相加问题的方法，通过使用链表数据结构来表示两个非负整数，并实现了它们的相加。文章详细阐述了算法步骤：遍历两个链表，逐位相加并处理进位，直至链表结束。

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
    	// Start typing your Java solution below
		// DO NOT write main() function
		if (l1 == null && l2 == null)
			return null;
		ListNode result = new ListNode(0);
		ListNode current = result;
		int carry = 0;
		int value = 0;
		while (l1 != null && l2 != null) {
			value = l1.val + l2.val + carry;
			current.next = new ListNode(value % 10);
			current = current.next;
			carry = value / 10;
			l1 = l1.next;
			l2 = l2.next;
		}
		while (l1 != null) {
			value = l1.val + carry;
			current.next = new ListNode(value % 10);
			current = current.next;
			carry = value / 10;
			l1 = l1.next;
		}
		while (l2 != null) {
			value = l2.val + carry;
			current.next = new ListNode(value % 10);
			current = current.next;
			carry = value / 10;
			l2 = l2.next;
		}
		if (carry != 0)
			current.next = new ListNode(1);

		current = result;
		result = result.next;
		return result;
    }
}