diff --git a/problems/0222.完全二叉树的节点个数.md b/problems/0222.完全二叉树的节点个数.md index bfb9ac0f..8a3a15f3 100644 --- a/problems/0222.完全二叉树的节点个数.md +++ b/problems/0222.完全二叉树的节点个数.md @@ -814,6 +814,35 @@ impl Solution { } ``` +// 迭代 +```rust +use std::rc::Rc; +use std::cell::RefCell; +use std::collections::VecDeque; +impl Solution { + pub fn count_nodes(root: Option>>) -> i32 { + let mut res = 0; + let mut queue = VecDeque::new(); + if root.is_some() { + queue.push_back(root); + } + while !queue.is_empty() { + for _ in 0..queue.len() { + let node = queue.pop_front().unwrap().unwrap(); + if node.borrow().left.is_some() { + queue.push_back(node.borrow().left.clone()); + } + if node.borrow().right.is_some() { + queue.push_back(node.borrow().right.clone()); + } + res += 1; + } + } + res + } +} +``` +