Simple Java 5 line solution with helper


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    public class Solution {
        public int sumOfLeftLeaves(TreeNode root) {
            return sumOfLeft(root,false);
        }
        
        public int sumOfLeft(TreeNode root, boolean isLeft){
            if(root==null)
                return 0;
            else if (isLeft && root.left==null && root.right==null)
                return root.val;
            return sumOfLeft(root.left,true)+sumOfLeft(root.right,false);
        }
    }

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