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#[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 {
pub fn range_sum_bst(root: Option<Rc<RefCell<TreeNode>>>, low: i32, high: i32) -> i32 {
if let Some(root) = root {
let mut sum = 0;
if low <= root.borrow().val && root.borrow().val <= high {
sum += root.borrow().val;
}
if low < root.borrow().val {
sum += Self::range_sum_bst(root.borrow().left.clone(), low, high);
}
if high > root.borrow().val {
sum += Self::range_sum_bst(root.borrow().right.clone(), low, high);
}
return sum;
}
0
}
}
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