본문 바로가기
Develop/코딩인터뷰

[코딩인터뷰] 백준 2146번

지람 2021. 3. 22. 00:15
반응형

백준 2146번
백준 2146번

from collections import deque
import sys
sys.setrecursionlimit(10000)

def create_island(id, x, y):
    global sea, islands, iv, dx, dy

    sea[x][y] = id
    islands[id].append((x,y, 0))
    iv[x][y] = True

    for i in range(4):
        nx = x + dx[i]
        ny = y + dy[i]

        if 0 <= nx < n and 0 <= ny < n:
            if not iv[nx][ny] and sea[nx][ny] == 1:
                create_island(id, nx, ny)

# 입력 정리
n = int(input())
sea = []
for _ in range(n):
    sea.append(list(map(int, input().split())))

dx = [-1, 0, 1, 0]
dy = [0, -1, 0, 1]

# 1. 섬 만들기
islands = {}
iv = [[False] * n for _ in range(n)]
iid = 2
for i in range(n):
    for j in range(n):
        if not iv[i][j] and sea[i][j] == 1:
            islands[iid] = []
            create_island(iid, i, j)
            iid += 1

# 2. 다리 만들기
answer = 10 ** 8
for id in range(2, iid):
    for land in islands[id]:
        lq = deque()
        lv = [[False] * n for _ in range(n)]

        for i in range(4):
            lx = land[0] + dx[i]
            ly = land[1] + dy[i]

            if 0 <= lx < n and 0 <= ly < n:
                if sea[lx][ly] == 0:
                    lq.append((lx, ly, 1))
                    lv[lx][ly] = True

        while len(lq) > 0:
            cx, cy, cd = lq.popleft()

            if sea[cx][cy] != 0 and cd - 1 < answer:
                answer = cd - 1

            for i in range(4):
                nx = cx + dx[i]
                ny = cy + dy[i]
                nd = cd + 1
                if 0 <= nx < n and 0 <= ny < n:
                    if not lv[nx][ny] and sea[nx][ny] != id:
                        lq.append((nx, ny, nd))
                        lv[nx][ny] = True

print(answer)

반례 목록

10
1 1 1 0 0 0 0 1 1 1
1 1 1 1 0 0 0 0 1 1
1 0 1 1 0 0 0 0 1 1
0 0 1 1 1 0 0 0 0 1
0 0 0 1 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
0 0 0 0 1 1 0 0 0 0
0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0

출력 3

100
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출력 197

5
1 0 0 0 1
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
1 1 0 0 1

출력 2

5
1 1 1 0 0
1 0 1 0 0
1 1 1 0 0 
0 0 0 0 0
0 0 0 0 1

출력 3

4
1 1 0 0
0 0 0 1
0 1 1 1
0 0 0 0

출력 1

3
1 1 0
0 0 0
0 1 1

출력 1

10
1 1 1 0 0 0 0 0 0 0
1 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0
0 0 1 0 0 0 0 1 0 0
0 0 0 0 0 0 1 1 0 0
0 0 0 0 1 0 1 0 0 0
0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0

출력 3

5
1 0 0 0 0
1 0 0 0 1
1 1 1 0 1
0 0 0 0 0
0 0 0 1 0

출력 1

10
1 1 1 0 0 0 0 1 1 1
1 1 1 1 0 0 0 0 1 1
1 0 1 1 0 0 0 0 1 1
0 0 1 1 1 0 0 0 0 1
0 0 0 1 1 0 0 0 0 1
0 0 0 0 1 0 0 0 0 1
0 0 0 0 1 0 0 0 0 0
0 0 0 0 1 1 0 0 0 0
0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0

출력 4

5
1 0 0 0 0
0 0 0 0 0
0 0 1 0 0
0 0 0 0 1
0 0 0 0 1

출력 2

6
1 1 1 0 0 0
1 1 0 0 0 1
1 0 0 0 1 1
0 0 0 0 0 1
1 1 1 1 1 1
0 0 0 0 0 0

출력 1

5
1 0 1 0 1 0
0 1 0 1 0 1
1 0 1 0 1 0
0 1 0 1 0 1
1 0 1 0 1 0

출력 1

2
1 0
0 1

출력 1
반응형
저작자표시 비영리 변경금지

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