GoalScope — serialize_bst (Qwen2.5-Coder-32B-Instruct) — hover a token to see the patched verbalization
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<code>↵
def serialize_bst(root):↵
"""Encodes a tree to a single string."""↵
def helper(node):↵
if not node:↵
return "null,"↵
return str(node.val) + "," + helper(node.left) + helper(node.right)↵
return helper(root)↵
↵
class TreeNode:↵
def __init__(self, val=0, left=None, right=None):↵
self.val = val↵
self.left = left↵
self.right = right↵
</code>