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每天一道Rust-LeetCode(2019-10-31) ​

坚持每天一道题,刷题学习Rust.

题目描述 ​

给定一个二叉树，编写一个函数来获取这个树的最大宽度。树的宽度是所有层中的最大宽度。这个二叉树与满二叉树（full binary tree）结构相同，但一些节点为空。

每一层的宽度被定义为两个端点（该层最左和最右的非空节点，两端点间的null节点也计入长度）之间的长度。

示例 1:

输入:

       1
     /   \
    3     2
   / \     \
  5   3     9

输出: 4 解释: 最大值出现在树的第 3 层，宽度为 4 (5,3,null,9)。 示例 2:

输入:

      1
     /
    3
   / \
  5   3

输出: 2 解释: 最大值出现在树的第 3 层，宽度为 2 (5,3)。 示例 3:

输入:

      1
     / \
    3   2
   /
  5

输出: 2 解释: 最大值出现在树的第 2 层，宽度为 2 (3,2)。 示例 4:

输入:

      1
     / \
    3   2
   /     \
  5       9
 /         \
6           7

输出: 8 解释: 最大值出现在树的第 4 层，宽度为 8 (6,null,null,null,null,null,null,7)。 注意: 答案在32位有符号整数的表示范围内。

来源：力扣（LeetCode） 链接：https://leetcode-cn.com/problems/maximum-width-of-binary-tree 著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

解题思路 ​

比较简单 逐层遍历,记录碰到的第一个非null值作为起始位置,最后一个非null值作为终结位置,计算两者差值即可. 注意: 就算是子节点为null也要放入队列,就算是父节点为null,其子节点一样要放入队列

解题过程 ​

rust
use crate::share::TreeNode;
use std::cell::RefCell;
use std::cmp::min;
use std::rc::Rc;

struct Solution {}
impl Solution {
    pub fn width_of_binary_tree(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
        let mut max_width = 0;
        let mut current_level = Vec::new();
        current_level.push(root);
        //        let mut current_level = current_level.as_slice();
        while current_level.len() > 0 {
            let mut start = -1;
            let mut end = -1;
            let mut lastNotNone = 0;
            let mut next_level = Vec::new();
            current_level.iter().enumerate().for_each(|r| {
                match r.1 {
                    None => {
                        if start >= 0 {
                            //如果左侧一直没有有效节点,下一层就不可能会有有效值,也不会影响宽度
                            next_level.push(None);
                            next_level.push(None);
                        }
                    }
                    Some(n) => {
                        if start == -1 {
                            start = r.0 as i32
                        }
                        end = r.0 as i32;
                        lastNotNone = r.0 * 2 + 1;
                        next_level.push(n.borrow().left.clone());
                        next_level.push(n.borrow().right.clone());
                    }
                }
            });
            if start >= 0 {
                let w = end - start + 1;
                if max_width < w {
                    max_width = w;
                }
                //对右侧裁剪一下,因为end 以后的null值也不会影响下一层的width计算
                let (left, _) = next_level.split_at(min(lastNotNone + 1, next_level.len()));
                //                println!(
                //                    "start={},end={},current w={},nodes count={},lastNotNone={}",
                //                    start,
                //                    end,
                //                    w,
                //                    left.len(),
                //                    lastNotNone,
                //                );
                current_level = Vec::from(left);
            } else {
                break; //一层都没有节点了,结束
            }
        }
        max_width
    }
}
#[cfg(test)]
mod test {
    use super::*;
    use crate::share::*;
    #[test]
    fn test_construct_tree() {
        let t1 = build_tree_ignore_parent(&vec![1, 3, 2, 5, null, null, 9, 6, null, null, 7]);
        assert_eq!(Solution::width_of_binary_tree(t1), 8);

        let t1 = build_tree_ignore_parent(&vec![1, 3, 2, 5, 3, null, 9]);
        assert_eq!(Solution::width_of_binary_tree(t1), 4);
        let t = build_tree_ignore_parent(&vec![
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
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            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null,
            0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0,
            null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, null, 0, 0,
        ]);
        assert_eq!(Solution::width_of_binary_tree(t), 1);
    }
}

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