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Yjason-K.ts
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39 lines (34 loc) ยท 1.23 KB
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/**
* Definition for a binary tree node.
* class TreeNode {
* val: number
* left: TreeNode | null
* right: TreeNode | null
* constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
* this.val = (val===undefined ? 0 : val)
* this.left = (left===undefined ? null : left)
* this.right = (right===undefined ? null : right)
* }
* }
*/
/**
* ๋ ํธ๋ฆฌ๊ฐ ๊ฐ์ ๊ฐ์ฒด ํธ๋ฆฌ์ธ์ง ํ์ธํ๋ ํจ์
* @param {Treenode | null} p - ํธ๋ฆฌ ๋
ธ๋ p
* @param {Treenode | null} q - ํธ๋ฆฌ ๋
ธ๋ q
* @returns {boolean} - ๋ ํธ๋ฆฌ๊ฐ ๋์ผํ ๊ตฌ์กฐ์ธ์ง ์ฌ๋ถ
*
* ์๊ฐ ๋ณต์ก๋: O(n)
* - ์ต๋ ๋ ํธ๋ฆฌ์ ๋ชจ๋ ๋
ธ๋๋ฅผ ํ ๋ฒ์ฉ๋ง ๋ฐฉ๋ฌธ
* ๊ณต๊ฐ ๋ณต์ก๋: O(n)
* - ์ฌ๊ท ํธ์ถ๋ก ํธ๋ฆฌ ๊น์ด ๋งํผ์ ๊ณต๊ฐ์ด ํ์
*/
function isSameTree(p: TreeNode | null, q: TreeNode | null): boolean {
// ๊ฐ์ ๊ฐ์ฒด๋ฅผ ๊ฐ๋ฆฌํค๊ณ ์๋ ๊ฒฝ์ฐ true
if (p === q) return true;
// ํ์ชฝ์ด null ์ธ ๊ฒฝ์ฐ false
if (!p || !q) return false;
// ๋ ๋
ธ๋๊ฐ ๋ค๋ฅธ ๊ฒฝ์ฐ false
if(p.val !== q.val) return false;
// ์ ๊ท๋ฅผ ํตํ ํ์ ํธ๋ฆฌ ๋น๊ต
return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
};