Easy to understand! recursive solution with flag to denote left leaves


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

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