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+ /**
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+ * Definition for a binary tree node.
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+ * class TreeNode {
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+ * val: number
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+ * left: TreeNode | null
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+ * right: TreeNode | null
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+ * constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
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+ * this.val = (val===undefined ? 0 : val)
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+ * this.left = (left===undefined ? null : left)
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+ * this.right = (right===undefined ? null : right)
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+ * }
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+ * }
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+ */
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+
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+ /**
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+ * ์ด์ง ํธ๋ฆฌ์ ์ต๋ ๊น์ด๋ฅผ ๊ณ์ฐํ๋ ํจ์
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+ * @param {TreeNode | null } root - ํธ๋ฆฌ์ ๋ฃจํธ ๋
ธ๋
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+ * @returns {number } - ํธ๋ฆฌ์ ์ต๋ ๊น์ด (์ต์์ ๋ฃจํธ์์ ๊ฐ์ฅ ๊น์ ๋ฆฌํ๊น์ง ๊น์ด)
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+ *
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+ * ์๊ฐ ๋ณต์ก๋: O(n)
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+ * - ๋ชจ๋ ๋
ธ๋๋ฅผ ํ ๋ฒ์ฉ ๋ฐฉ๋ฌธํ์ฌ ๊น์ด๋ฅผ ๊ณ์ฐ
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+ *
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+ * ๊ณต๊ฐ ๋ณต์ก๋: O(h) (h - ํธ๋ฆฌ์ ๋์ด)
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+ */
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+ function maxDepth ( root : TreeNode | null ) : number {
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+ if ( ! root ) return 0 ; // ๋
ธ๋๊ฐ ์์ผ๋ฉด ๊น์ด๋ 0
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+
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+ return Math . max ( maxDepth ( root . left ) , maxDepth ( root . right ) ) + 1 ; // ์ผ์ชฝ, ์ค๋ฅธ์ชฝ ์๋ธํธ๋ฆฌ ์ค ๋ ๊น์ ๊ฐ์ +1
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+ } ;
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+
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