Solution

Memo

  • ์žฌ๊ท€ ๊ตฌํ˜„ ๋ฌธ์ œ
  • bottomup ๋ฐฉ์‹๋„ ์žˆ๋Š”๋ฐ ์‹œ๊ฐ„๋ณต์žก๋„๋Š” ๋˜‘๊ฐ™์•„์„œ ๊ทธ๋ƒฅ ํ–ˆ๋‹ค.