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110. Balanced Binary Tree#1013
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39 changes: 39 additions & 0 deletionsswift/110-Balanced-Binary-Tree.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| /** | ||
| * Definition for a binary tree node. | ||
| * public class TreeNode { | ||
| * public var val: Int | ||
| * public var left: TreeNode? | ||
| * public var right: TreeNode? | ||
| * public init() { self.val = 0; self.left = nil; self.right = nil; } | ||
| * public init(_ val: Int) { self.val = val; self.left = nil; self.right = nil; } | ||
| * public init(_ val: Int, _ left: TreeNode?, _ right: TreeNode?) { | ||
| * self.val = val | ||
| * self.left = left | ||
| * self.right = right | ||
| * } | ||
| * } | ||
| */ | ||
| class Solution { | ||
| func getMaxHeight(of root: TreeNode?) -> Int { | ||
| guard let root = root else { return 0 } | ||
| return 1 + max( | ||
| getMaxHeight(of: root.left), | ||
| getMaxHeight(of: root.right) | ||
| ) | ||
| } | ||
| func isBalanced(_ root: TreeNode?) -> Bool { | ||
| guard let root = root else { return true } | ||
| let leftHeight = getMaxHeight(of: root.left) | ||
| let rightHeight = getMaxHeight(of: root.right) | ||
| let difference = abs(leftHeight - rightHeight) | ||
| // early exits | ||
| guard difference <= 1 else { return false } | ||
| guard isBalanced(root.left) == true else { return false } | ||
| guard isBalanced(root.right) == true else { return false } | ||
| return true | ||
| } | ||
| } |
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