[Leetcode] 298. Binary Tree Longest Consecutive Sequence
這一題比較簡單的做法是DFS的bottom up。從上往下傳遞當前的連續長度和上一層的節點。如果上一層的節點是當前節點減一，那麼上一層傳下來的連續長度加一，否則連續長度重置爲一。然後繼續往左或者右傳遞。然後從當前值和左邊返回的值和右邊子樹返回的值中取最大值返回。 public int longestConsecutive(TreeNode root) {
return this._
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