์ž์‹ ๊ฒŒ์ž„์˜ค๋ธŒ์ ํŠธ๊ฐ€ ๋งŽ๊ณ , ์ฐธ์กฐํ•˜๋Š” (๊ฐ–๋‹ค์“ฐ๋Š”) ์Šคํฌ๋ฆฝํŠธ๊ฐ€ ๋งŽ์€๋ฐ

ex) A ์—์„œ๋Š” ์ž์‹ 1,2,3

B์—์„œ๋Š” ์ž์‹ 2,5 ๋ฅผ ์ฐธ์กฐํ•˜๋Š” ๋“ฑ


์ด๋•Œ getchild๋กœ ํ•จ? ์•„๋‹ˆ๋ฉด ์ธ์ŠคํŽ™ํ„ฐ๋กœ ํ•จ?