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530.二叉搜索树的最小绝对差 python迭代法没有取abs

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problems/0530.二叉搜索树的最小绝对差.md
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@ -233,7 +233,7 @@ class Solution:
else: # 逐一处理节点 else: # 逐一处理节点
cur = stack.pop() cur = stack.pop()
if pre: # 当前节点和前节点的值的差值 if pre: # 当前节点和前节点的值的差值
result = min(result, cur.val - pre.val) result = min(result, abs(cur.val - pre.val))
pre = cur pre = cur
cur = cur.right cur = cur.right
return result return result