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| // @Title: 两数相加 (Add Two Numbers)
// @Author: 15816537946@163.com
// @Date: 2022-01-31 15:25:15
// @Runtime: 0 ms
// @Memory: 2.1 MB
// Definition for singly-linked list.
// #[derive(PartialEq, Eq, Clone, Debug)]
// pub struct ListNode {
// pub val: i32,
// pub next: Option<Box<ListNode>>
// }
//
// impl ListNode {
// #[inline]
// fn new(val: i32) -> Self {
// ListNode {
// next: None,
// val
// }
// }
// }
// struct Solution;
// use crate::utils::linked_list::{to_list, ListNode};
impl Solution {
pub fn add_two_numbers(
l1: Option<Box<ListNode>>,
l2: Option<Box<ListNode>>,
) -> Option<Box<ListNode>> {
match (l1, l2) {
(None, None) => None,
(None, Some(n)) | (Some(n), None) => Some(n),
(Some(n1), Some(n2)) => {
let sum = n1.val + n2.val;
if sum < 10 {
Some(Box::new(ListNode {
val: sum,
next: Solution::add_two_numbers(n1.next, n2.next),
}))
} else {
let carry = Some(Box::new(ListNode::new(1)));
Some(Box::new(ListNode {
val: sum - 10,
next: Solution::add_two_numbers(
Solution::add_two_numbers(carry, n1.next),
n2.next,
),
}))
}
}
}
}
}
|