Simple and Clear 5-line Java Solution 8ms


  • 0
    E
    public class Solution {
        public int sumOfLeftLeaves(TreeNode root) {
            if (root == null) return 0;
            if (root.left != null && root.left.left == null && root.left.right == null)
                return root.left.val + sumOfLeftLeaves(root.right);
            return sumOfLeftLeaves(root.left) + sumOfLeftLeaves(root.right);
        }
    }
    

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