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46-9kyo-hwang #167

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merged 6 commits into from
May 29, 2024
Merged

46-9kyo-hwang #167

merged 6 commits into from
May 29, 2024

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9kyo-hwang
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@9kyo-hwang 9kyo-hwang commented May 13, 2024

๐Ÿ”— ๋ฌธ์ œ ๋งํฌ

14503 ๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ

โœ”๏ธ ์†Œ์š”๋œ ์‹œ๊ฐ„

30๋ถ„

โœจ ์ˆ˜๋„ ์ฝ”๋“œ

1. ๋ฌธ์ œ

$1$ x $1$ ํฌ๊ธฐ์˜ ์ •์‚ฌ๊ฐํ˜• ์นธ์œผ๋กœ ์ด๋ฃจ์–ด์ง„ $N$ x $M$ ํฌ๊ธฐ์˜ ๋ฐฉ์ด ์žˆ๋‹ค. ๊ฐ ์นธ์€ ๋นˆ ์นธ(0) ์ด๊ฑฐ๋‚˜ ๋ฒฝ(1)์ด๋‹ค.
๋™, ์„œ, ๋‚จ, ๋ถ ๋ฐฉํ–ฅ์œผ๋กœ ์›€์ง์ผ ์ˆ˜ ์žˆ๋Š” ๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ๊ฐ€ $(r, c)$ ์ขŒํ‘œ์—์„œ ์ถœ๋ฐœํ•ด ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๋™์ž‘ํ•œ๋‹ค.

  1. ํ˜„์žฌ ์นธ์ด ์•„์ง ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๊ฒฝ์šฐ, ํ˜„์žฌ ์นธ์„ ์ฒญ์†Œํ•œ๋‹ค.
  2. ํ˜„์žฌ ์นธ์˜ ์ฃผ๋ณ€ $4$์นธ ์ค‘ ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ์ด ์—†๋Š” ๊ฒฝ์šฐ,
    1. ๋ฐ”๋ผ๋ณด๋Š” ๋ฐฉํ–ฅ์„ ์œ ์ง€ํ•œ ์ฑ„๋กœ ํ•œ ์นธ ํ›„์ง„ํ•  ์ˆ˜ ์žˆ๋‹ค๋ฉด ํ•œ ์นธ ํ›„์ง„ํ•˜๊ณ  1๋ฒˆ์œผ๋กœ ๋Œ์•„๊ฐ„๋‹ค.
    2. ๋ฐ”๋ผ๋ณด๋Š” ๋ฐฉํ–ฅ์˜ ๋’ค์ชฝ ์นธ์ด ๋ฒฝ์ด๋ผ ํ›„์ง„ํ•  ์ˆ˜ ์—†๋‹ค๋ฉด ์ž‘๋™์„ ๋ฉˆ์ถ˜๋‹ค.
  3. ํ˜„์žฌ ์นธ์˜ ์ฃผ๋ณ€ $4$์นธ ์ค‘ ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ์ด ์žˆ๋Š” ๊ฒฝ์šฐ,
    1. ๋ฐ˜์‹œ๊ณ„ ๋ฐฉํ–ฅ์œผ๋กœ $90^\circ$ ํšŒ์ „ํ•œ๋‹ค.
    2. ๋ฐ”๋ผ๋ณด๋Š” ๋ฐฉํ–ฅ์„ ๊ธฐ์ค€์œผ๋กœ ์•ž์ชฝ ์นธ์ด ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ์ธ ๊ฒฝ์šฐ ํ•œ ์นธ ์ „์ง„ํ•œ๋‹ค.
    3. 1๋ฒˆ์œผ๋กœ ๋Œ์•„๊ฐ„๋‹ค.

๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ๊ฐ€ ์ž‘๋™์„ ์‹œ์ž‘ํ•œ ํ›„ ์ž‘๋™์„ ๋ฉˆ์ถœ ๋•Œ๊นŒ์ง€ ์ฒญ์†Œํ•˜๋Š” ์นธ์˜ ๊ฐœ์ˆ˜๋ฅผ ์ถœ๋ ฅํ•œ๋‹ค.

2. ํ’€์ด

์‹ฌํ”Œํ•œ ๊ตฌํ˜„/์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋ฌธ์ œ์ด๋‹ค. ๋ฌธ์ œ์—์„œ ์„ค๋ช…ํ•œ ๋Œ€๋กœ ์ฐจ๊ทผ์ฐจ๊ทผ ํ•˜๋‚˜์”ฉ ๊ตฌํ˜„ํ•ด๋ณด์ž.

์ž…๋ ฅ

N, M = map(int, input().split())
r, c, d = map(int, input().split())
room = [list(map(int, input().split())) for _ in range(N)]
offset = ((-1, 0), (0, 1), (1, 0), (0, -1))

์ฃผ์–ด์ง€๋Š” ๋ฐ์ดํ„ฐ๋ฅผ ์ €์žฅํ•œ๋‹ค. ๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ๋Š” 4๊ฐ€์ง€ ๋ฐฉํ–ฅ์„ ๊ฐ€์ง€๊ณ  ์žˆ๋Š”๋ฐ ๊ฐ๊ฐ ๋ถ - 0, ๋™ - 1, ๋‚จ - 2, ์„œ - 3 ์ด๋ผ ํ–ˆ์œผ๋ฏ€๋กœ ๊ทธ์— ๋งž๊ฒŒ ๋ฐฉํ–ฅ ์˜คํ”„์…‹ ์ •๋ณด๋ฅผ ํ•จ๊ป˜ ์ €์žฅํ•œ๋‹ค.

cnt = 0
while True:
    ...

print(cnt)

๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ๊ฐ€ ๋™์ž‘์„ ๋ฉˆ์ถœ ๋•Œ๊นŒ์ง€ ๋ฌดํ•œ ๋ฐ˜๋ณต๋ฌธ์„ ๋Œ๋ฆฐ๋‹ค. ๋™์ž‘์„ ๋ฉˆ์ถ”๋ฉด ์ฒญ์†Œํ•œ ๋ฐฉ ๊ฐœ์ˆ˜ cnt๋ฅผ ์ถœ๋ ฅํ•œ๋‹ค.

๋™์ž‘ 1

if room[r][c] == 0:
    room[r][c] = 2
    cnt += 1

๋งŒ์•ฝ ํ˜„์žฌ ์นธ์ด ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ(0)์ด๋ผ๋ฉด ์ฒญ์†Œ(2)ํ•œ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ์ฒญ์†Œํ•œ ์นธ ์ˆ˜(cnt)๋ฅผ 1 ์ฆ๊ฐ€์‹œํ‚จ๋‹ค.

๋™์ž‘ 2

if not is_there_a_blank_space():
    dr, dc = offset[(d + 2) % 4]
    nr, nc = r + dr, c + dc
    
    if not out_of_bound(nr, nc) and room[nr][nc] != 1:
        r, c = nr, nc
    else:
        break

์ฃผ๋ณ€ 4๋ฐฉํ–ฅ์— ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ์ด ์—†๋‹ค๋ฉด(is_there_a_blank_space() == False)

  • ํ˜„์žฌ ๋ฐ”๋ผ๋ณด๋Š” ๋ฐฉํ–ฅ์˜ ๋’ค์ชฝ((d + 2) % 4) ์นธ์„ ๊ฒ€์‚ฌํ–ˆ์„ ๋•Œ, ๊ฐˆ ์ˆ˜ ์žˆ๋Š” ์นธ์ด๋ผ๋ฉด ์ด๋™ํ•œ๋‹ค.
  • ์•„๋‹ˆ๋ผ๋ฉด ๋กœ๋ด‡์ฒญ์†Œ๊ธฐ ๋™์ž‘์„ ์ค‘๋‹จํ•œ๋‹ค.

is_there_a_blank_space() ํ•จ์ˆ˜๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

def is_there_a_blank_space() -> bool:
    for dr, dc in offset:
        nr, nc = r + dr, c + dc
        
        if not out_of_bound(nr, nc) and room[nr][nc] == 0:
            return True
            
    return False

๋ฐฉํ–ฅ ์˜คํ”„์…‹ ๊ฐ’์„ ํ•˜๋‚˜์”ฉ ๊บผ๋‚ด์™€ ํ˜„์žฌ ์ขŒํ‘œ(r, c)์— ๋”ํ•ด ์ธ์ ‘ ์นธ ์ขŒํ‘œ(nr, nc)๋ฅผ ์–ป์–ด์˜จ๋‹ค.

  • ๋งŒ์•ฝ ์ธ์ ‘ ์นธ์ด ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ(0)์ด๋ผ๋ฉด True๋ฅผ ๋ฐ˜ํ™˜ํ•œ๋‹ค.
  • 4๋ฐฉํ–ฅ ๋ชจ๋‘ ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ์ด ์•„๋‹ˆ๋ผ๋ฉด False๋ฅผ ๋ฐ˜ํ™˜ํ•œ๋‹ค.

๋™์ž‘ 3

else:
    d = (d - 1) % 4
    dr, dc = offset[d]
    nr, nc = r + dr, c + dc
    
    if not out_of_bound(nr, nc) and room[nr][nc] == 0:
        r, c = nr, nc

is_there_a_blank_space() ํ•จ์ˆ˜๊ฐ€ True์ธ ๊ฒฝ์šฐ ์ง„์ž…ํ•œ๋‹ค.

  • ๋ฐ˜์‹œ๊ณ„ ๋ฐฉํ–ฅ์œผ๋กœ 90๋„ ํšŒ์ „((d - 1) % 4)ํ•œ๋‹ค.
  • ๋งŒ์•ฝ ํšŒ์ „ํ•œ ๋ฐฉํ–ฅ์˜ ์ธ์ ‘ ์นธ์ด ์ฒญ์†Œ๋˜์ง€ ์•Š์€ ๋นˆ ์นธ(0)์ด๋ผ๋ฉด ์ด๋™ํ•œ๋‹ค.

๐Ÿ“š ์ƒˆ๋กญ๊ฒŒ ์•Œ๊ฒŒ๋œ ๋‚ด์šฉ

์—„ solved.ac์—์„œ ๊ณจ๋žœ๋”” ํ• ๋ ค๊ณ  ๊ฒ€์ƒ‰ํ•ด์„œ ์•ˆ ํ‘ผ ๊ฑฐ ํ•˜๋‚˜ ๊ณจ๋ž๋Š”๋ฐ ์ƒ๊ฐ๋ณด๋‹ค ๋„ˆ๋ฌด ์‰ฌ์šด ๊ฑธ ํ‘ผ ๊ฒƒ ๊ฐ™๋„ค์š”.
๋‹ค์Œ์—” ์ข€ ๋” ์–ด๋ ค์šด ๊ฑฐ ๊ฐ€์ ธ์˜ค๊ฒ ์Šต๋‹ˆ๋‹ค.

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๊ณ ์ƒํ•˜์…จ์Šต๋‹ˆ๋‹ค! ์—ฌ๋Ÿฌ ๋ฌธ์ œ๋“ค๋„ ์žˆ์—ˆ๋Š”๋ฐ ๋กœ๋ด‡์ฒญ์†Œ๊ธฐ๊ฐ€ ์ด์Šˆ์— ์žˆ์–ด์„œ ๋กœ๋ด‡ ์ฒญ์†Œ๊ธฐ๋งŒ ์ผ๋‹จ ๋ฆฌ๋ทฐํ–ˆ์Šต๋‹ˆ๋‹ค.
cpp์€ ์ต์ˆ™ํ•˜์ง€ ์•Š์€๋ฐ ๋กœ์ง์„ ๋„ˆ๋ฌด ์„ค๋ช…์„ ์ž˜ํ•˜์…”์„œ ์ฝ์–ด์กŒ์Šต๋‹ˆ๋‹ค ใ…‹ใ…‹ใ…‹ใ…‹
๋•๋ถ„์— ๋งŽ์ด ๋ฐฐ์›๋‹ˆ๋‹ค ๐Ÿ™‡โ€โ™‚๏ธ

vector<vector<int>> Room;
int r, c, d;

bool OutOfBound(int InR, int InC)
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์•„๋ž˜์—์„œ ์‚ฌ์šฉํ•˜๋Š” ๋ฉ”์„œ๋“œ์™€ ๊ฐ™์ด boolean์˜ ๊ฒฝ์šฐ is๋กœ ๋„ค์ด๋ฐํ•˜์‹œ๋ฉด ๋” ์ฝ๊ธฐ ์ข‹์„ ๊ฒƒ ๊ฐ™์•„์š” ๐Ÿ‘

 bool OutOfBound(int InR, int InC) ->  bool isOutOfBound(int InR, int InC) 

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์ €๋„ ์˜ˆ์ „์—” is๋ฅผ ๋ถ™์˜€์—ˆ๋Š”๋ฐ, C์—์„œ ๋ฐฐ์—ด ์ธ๋ฑ์Šค ๋ฒ—์–ด๋‚˜๋ฉด ์ปดํŒŒ์ผ๋Ÿฌ์—์„œ out of bound ์—๋Ÿฌ๋ฅผ ๋„์–ด์ฃผ๋Š” ๊ฑฐ ๋ณด๊ณ  "๊ตณ์ด is ์•ˆ๋ถ™์—ฌ๋„ ๋  ๋“ฏ?" ํ•˜๋ฉด์„œ ์•ˆ๋ถ™์ด๋˜๊ฒŒ ์ง€๊ธˆ๊นŒ์ง€ ๋ฒ„๋ฆ‡์ด ๋๋„ค์š” ใ…‹ใ…‹
๋‹ค์Œ๋ถ€ํ„ด ๋‹ค์‹œ ๋ถ™์—ฌ๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค :)

const auto& [dr, dc] = Offset[(d + 2) % 4];
int nr = r + dr, nc = c + dc;

if(!OutOfBound(nr, nc) && Room[nr][nc] != 1)
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ํ•ด๋‹น ๋ผ์ธ์„ ์•„๋ž˜์™€ ๊ฐ™์ด ๋‘๊ณ  break ์œผ๋กœ ๋‘๋ฉด else๋ฌธ์„ ์ค„ ์ผ ์ˆ˜ ์žˆ์ง€์•Š์„๊นŒ์š”..?!

if(isOutOfBound(nr, nc) || Room[nr][nc] == WALL) {
    break; 
}
r = nr, c = nc;

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๋งž์Šต๋‹ˆ๋‹ค. ๋‹ค๋งŒ ์—ฌ๊ธฐ ๊ฐ™์€ ๊ฒฝ์šฐ์—” ๋ฌธ์ œ์—์„œ ์ฃผ์–ด์ง„ ์กฐ๊ฑด๊ณผ ์ผ์น˜ํ•˜๋„๋ก ์ผ๋ถ€๋Ÿฌ ์ž‘์„ฑํ•˜๊ธด ํ–ˆ์Šต๋‹ˆ๋‹ค ใ…‹ใ…‹

}

bool IsThereABlankSpace()
{
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ํ˜น์‹œ ์ค‘๊ด„ํ˜ธ๋Š” ์ฝ๊ธฐ ํŽธํ•˜๊ฒŒ ํ•˜์‹œ๋ ค๊ณ , ์œ„์™€ ๊ฐ™์ด ์‚ฌ์šฉํ•˜์‹œ๊ณ  ๊ณ„์‹ ๊ฑด๊ฐ€์š”?!

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์š”๊ฑฐ๋Š” ์š”์ƒˆ ์ œ๊ฐ€ ๊ณต๋ถ€ํ•˜๊ณ  ์žˆ๋Š” Unreal Engine์˜ C++ ์ฝ”๋“œ ์ปจ๋ฒค์…˜๊ณผ ๋น„์Šทํ•˜๊ฒŒ ๋งž์ถ”๋ ค๊ณ  ์ด๋ ‡๊ฒŒ ํ•˜๋Š” ์ค‘์ž…๋‹ˆ๋‹ค :)
์–ธ๋ฆฌ์–ผ C++ ์ปจ๋ฒค์…˜์ด ์ค‘๊ด„ํ˜ธ๋ฅผ ๋‹ค์Œ ์ค„๋กœ ๋„˜๊ธฐ๋”๋ผ๊ตฌ์š”.

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๋ฆฌ๋ทฐ๊ฐ€ ๋Šฆ์—ˆ๋„ค์š”....๐ŸงŽ๐Ÿปโ€โ™€๏ธ
30๋ถ„๋งŒ์— ๋š๋”ฑ ํ’€๋‹ค๋‹ˆ ์—ญ์‹œ...๐Ÿ‘
์ €๋Š” ์—๋Ÿฌ๊ฐ€ ๋‚˜์„œ ํ•˜๋ฃจ ์ง€๋‚˜๊ณ  ๋‹ค์‹œ ํ’€์—ˆ์Šต๋‹ˆ๋‹ค ํ—ˆํ—ˆ
์ฝ”๋“œ๋งŒ ์Šค์œฝ ๋‚จ๊ธฐ๊ณ  ๊ฐ€๊ฒ ์Šต๋‹ˆ๋‹ค!!

์ฝ”๋“œ
input = open(0).readline
dir = [0, 1, 2, 3]  # ๋ถ, ๋™, ๋‚จ, ์„œ
dx = [-1, 0, 1, 0]
dy = [0, 1, 0, -1]
ans = 0

def now_clean(x, y, d):
    global ans
    if room[x][y] == 0:  # ํ˜„์žฌ ์ฒญ์†Œ X
        ans += 1
        room[x][y] = 2  # ์ฒญ์†Œ ์™„๋ฃŒ ํ‘œ์‹œ
    around_clean(x, y, d)

def around_clean(x, y, d):
    for _ in range(4):
        d = (d + 3) % 4  # ๋ฐ˜์‹œ๊ณ„๋กœ 90๋„ ํšŒ์ „
        if room[x + dx[d]][y + dy[d]] == 0:  # ์•ž์˜ ๋นˆ์นธ์ด ์ฒญ์†Œ X
            now_clean(x + dx[d], y + dy[d], d)
            return
    back(x, y, d)

def back(x, y, d):
    bd = (d + 2) % 4  # ํ›„์ง„ ๋ฐฉํ–ฅ
    if room[x + dx[bd]][y + dy[bd]] != 1:  # ๋ฒฝ์ด ์•„๋‹Œ ๊ฒฝ์šฐ ํ›„์ง„
        now_clean(x + dx[bd], y + dy[bd], d)

N, M = map(int, input().split())
initial_x, initial_y, initial_d = map(int, input().split())
room = [list(map(int, input().split())) for _ in range(N)]

now_clean(initial_x, initial_y, initial_d)
print(ans)

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๋ฌธ์ œ์—์„œ ์ˆซ์ž๊ฐ€ ๋’ค์ฃฝ๋ฐ•์ฃฝ ์„ž์—ฌ์žˆ๋Š”๊ฑฐ ๋ณด๊ณ  ๊ณ ๋ฏผํ–ˆ์—ˆ๋Š”๋ฐ... PR์— ๋ฌธ์ œ ์ •๋ฆฌ๋œ ๊ฑฐ ๋ณด๊ณ  ์ดํ•ดํ–ˆ๋„ค์š” ๐Ÿ˜ข

๋ฌธ์ œ์— ์ฃผ์–ด์ง„๋Œ€๋กœ ๊ตฌํ˜„ํ•˜๋ฉด ๋˜์ง€๋งŒ...
์•ฝ๊ฐ„ ๋‹ค๋ฅธ ๋ฐฉ๋ฒ•์œผ๋กœ ํ’€์ดํ•œ ๋ฐฉ๋ฒ•์œผ๋กœ ์ฝ”๋“œ ๋‚จ๊น๋‹ˆ๋‹ค!

2๋ฒˆ ๊ณผ์ •์—์„œ ๊ฒฐ๊ตญ ์ฃผ๋ณ€์„ ๋Œ๋ฉด์„œ ์ฒญ์†Œ๋ฅผ ํ–ˆ๋Š”์ง€ ์•ˆํ–ˆ๋Š”์ง€ ํ™•์ธํ•˜๊ธฐ ๋•Œ๋ฌธ์—
3๋ฒˆ ๊ณผ์ •์„ ๋จผ์ € ํ•ด์ฃผ๊ณ , 2๋ฒˆ์„ ํ•ด์ฃผ์—ˆ์Šต๋‹ˆ๋‹ค.

๋ฐ˜์‹œ๊ณ„๋กœ 4๋ฒˆ ๋Œ ๋•Œ๊นŒ์ง€ ( ์›์ƒํƒœ๊ฐ€ ๋  ๋•Œ๊นŒ์ง€ ), ์ฒญ์†Œํ•ด์•ผ ํ•˜๋Š” ๊ณณ์ด ์—†๋‹ค๋ฉด
2๋ฒˆ์„ ์‹œํ–‰ํ•˜๋Š” ๊ฒƒ์œผ๋กœ ํ•˜์˜€์Šต๋‹ˆ๋‹ค.

input = open("input.txt").readline

N, M = map(int, input().split())
r, c, d = map(int, input().split())
room = [list(map(int, input().split())) for _ in range(N)]
offset = ((-1, 0), (0, 1), (1, 0), (0, -1))


cnt = 0

while True:
    # 1
    if room[r][c] == 0:
        room[r][c] = 2
        cnt += 1
    
    is_clean = False

    # 3 (๋ฐ˜์‹œ๊ณ„๋กœ ํšŒ์ „)
    for turn in range(1, 5):
        dr, dc = offset[d-turn]
        nr, nc = r + dr, c + dc
        
        if nr < 0 or nr == N or nc < 0 or nc == M or room[nr][nc] != 0:
            continue

        r, c = nr, nc
        d = (d - turn)%4
        is_clean = True
        break

    # 2 (๋’ค๋กœ ํ•œ์นธ)
    if not is_clean:
        dr, dc = offset[d-2]
        nr, nc = r + dr, c + dc

        if nr < 0 or nr == N or nc < 0 or nc == M or room[nr][nc] == 1:
            break
        
        r, c = nr, nc

print(cnt)

ํŒŒ์ด์ฌ์€ ๋งˆ์ด๋„ˆ์Šค๋กœ๋„ ๋ฆฌ์ŠคํŠธ ์ ‘๊ทผ์ด ๊ฐ€๋Šฅํ•˜๊ณ , ๋‚˜๋จธ์ง€๋ฅผ ๊ณ„์‚ฐํ•˜๋Š” ๊ฒƒ๋„ ์ž˜ ๊ตฌํ•ด์ฃผ๊ธฐ ๋•Œ๋ฌธ์— ๋ƒ…๋‹ค ๋นผ๊ณ  ๋‹ค๋ฅธ ์ฒ˜๋ฆฌ๋Š” ์•ˆํ•ด์คฌ์Šต๋‹ˆ๋‹ค.

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4 participants