20240618 Finished

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jackfiled 2024-06-18 11:15:25 +08:00
parent 1965c6fabd
commit aa86d463b0
2 changed files with 74 additions and 1 deletions

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@ -152,3 +152,4 @@ mod p222_count_complete_tree_nodes;
mod p199_binary_tree_right_side_view;
mod p637_average_of_levels_in_binary_tree;
mod p530_minimum_absolute_difference_in_bst;
mod p230_kth_smallest_element_in_a_bst;

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@ -0,0 +1,72 @@
/**
* [230] Kth Smallest Element in a BST
*/
pub struct Solution {}
use crate::util::tree::{TreeNode, to_tree};
// submission codes start here
// Definition for a binary tree node.
// #[derive(Debug, PartialEq, Eq)]
// pub struct TreeNode {
// pub val: i32,
// pub left: Option<Rc<RefCell<TreeNode>>>,
// pub right: Option<Rc<RefCell<TreeNode>>>,
// }
//
// impl TreeNode {
// #[inline]
// pub fn new(val: i32) -> Self {
// TreeNode {
// val,
// left: None,
// right: None
// }
// }
// }
use std::rc::Rc;
use std::cell::RefCell;
impl Solution {
fn inorder_iterate(node: &Rc<RefCell<TreeNode>>, count: &mut i32, target: i32) -> Option<i32> {
if let Some(left) = node.borrow().left.as_ref() {
if let Some(result) = Self::inorder_iterate(left, count, target) {
return Some(result);
}
};
*count += 1;
if *count == target {
return Some(node.borrow().val);
}
if let Some(right) = node.borrow().right.as_ref() {
if let Some(result) = Self::inorder_iterate(right, count, target) {
return Some(result);
}
}
None
}
pub fn kth_smallest(root: Option<Rc<RefCell<TreeNode>>>, k: i32) -> i32 {
let mut count = 0;
if let Some(root) = root {
return Self::inorder_iterate(&root, &mut count, k).unwrap()
}
0
}
}
// submission codes end
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_230() {
}
}