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📅 最后修改于: 2022-03-11 14:45:52.446000 🧑 作者: Mango
def to_string(node): def actual_recursive(node): nonlocal a_str # ~global, can modify surrounding function's scope. a_str += str(node.val) if node.next != None: actual_recursive(node.next) a_str = '' actual_recursive(node) return a_str