[Leetcode] 298. Binary Tree Longest Consecutive Sequence
这一题比较简单的做法是DFS的bottom up。从上往下传递当前的连续长度和上一层的节点。如果上一层的节点是当前节点减一，那么上一层传下来的连续长度加一，否则连续长度重置为一。然后继续往左或者右传递。然后从当前值和左边返回的值和右边子树返回的值中取最大值返回。 public int longestConsecutive(TreeNode root) {
return this._
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