Iterative Java


  • 0
    Y
    class Solution {
        public List<Integer> largestValues(TreeNode root) {
            List<Integer> res = new ArrayList<>();
            if (root == null) return res;
            Queue<TreeNode> queue = new LinkedList<>();
            queue.offer(root);
            while (!queue.isEmpty()){
                int size = queue.size();
                int max = Integer.MIN_VALUE;
                for(int i=0;i<size;i++){
                    TreeNode head = queue.poll();
                    if (max < head.val) max = head.val;
                    if (head.left != null) queue.offer(head.left);
                    if (head.right != null) queue.offer(head.right);
                }
                res.add(max);
            }
            return res;
        }
    }
    

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