72 lines
1.6 KiB
Rust
72 lines
1.6 KiB
Rust
/**
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* [101] Symmetric Tree
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*/
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pub struct Solution {}
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use crate::util::tree::{TreeNode, to_tree};
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// submission codes start here
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// Definition for a binary tree node.
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// #[derive(Debug, PartialEq, Eq)]
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// pub struct TreeNode {
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// pub val: i32,
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// pub left: Option<Rc<RefCell<TreeNode>>>,
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// pub right: Option<Rc<RefCell<TreeNode>>>,
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// }
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//
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// impl TreeNode {
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// #[inline]
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// pub fn new(val: i32) -> Self {
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// TreeNode {
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// val,
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// left: None,
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// right: None
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// }
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// }
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// }
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use std::rc::Rc;
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use std::cell::RefCell;
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impl Solution {
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fn is_same(left: &Option<Rc<RefCell<TreeNode>>>, right: &Option<Rc<RefCell<TreeNode>>>) -> bool {
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if left.is_some() ^ right.is_some() {
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return false;
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}
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if left.is_none() && right.is_none() {
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return true;
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}
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let left = left.as_ref().unwrap();
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let right = right.as_ref().unwrap();
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if left.borrow().val != right.borrow().val {
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return false;
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}
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Self::is_same(&left.borrow().left, &right.borrow().right)
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&& Self::is_same(&left.borrow().right, &right.borrow().left)
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}
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pub fn is_symmetric(root: Option<Rc<RefCell<TreeNode>>>) -> bool {
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if let Some(root) = root {
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return Self::is_same(&root.borrow().left, &root.borrow().right);
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}
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true
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}
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}
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// submission codes end
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_101() {
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assert!(Solution::is_symmetric(tree![1,2,2,3,4,4,3]));
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assert!(!Solution::is_symmetric(tree!(1,2,2,"null",3,"null",3)))
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}
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}
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