백준 7576번 토마토

문제 링크: https://www.acmicpc.net/problem/7576

Author: skysign

백준 7576번 토마토/main.py

@@ -0,0 +1,49 @@
+import sys
+from collections import deque
+from typing import List, Deque
+
+
+def solve():
+    M, N = map(int, sys.stdin.readline().strip().split(' '))
+    maps: List[List[int]] = [[0 for _ in range(M)] for _ in range(N)]
+    queue: Deque = deque()
+
+    for row_idx in range(N):
+        line = list(map(int, sys.stdin.readline().strip().split(' ')))
+        for col_idx in range(M):
+            maps[row_idx][col_idx] = line[col_idx]
+            if maps[row_idx][col_idx] == 1:
+                queue.append([row_idx, col_idx, 0])
+
+    answer = bfs(queue, maps, N, M)
+
+    for row_idx in range(N):
+        for col_idx in range(M):
+            if maps[row_idx][col_idx] == 0:
+                print(-1)
+                return
+
+    print(answer)
+
+
+def bfs(queue: Deque, maps: List[List[int]], row_max, col_max):
+    answer: int = 0
+    drc = [[-1, 0], [0, 1], [1, 0], [0, -1]]
+
+    while queue:
+        rs, cs, v = queue.popleft()
+
+        for dr, dc in drc:
+            nr, nc = rs + dr, cs + dc
+
+            if (0 <= nr < row_max) and (0 <= nc < col_max):
+                if maps[nr][nc] == 0:
+                    maps[nr][nc] = 1
+                    queue.append([nr, nc, v + 1])
+                    answer = max(answer, v + 1)
+
+    return answer
+
+
+if __name__ == '__main__':
+    solve()

백준 7576번 토마토/test1.txt

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+6 4
+0 0 0 0 0 0
+0 0 0 0 0 0
+0 0 0 0 0 0
+0 0 0 0 0 1

백준 7576번 토마토/test1_answer.txt

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+8

백준 7576번 토마토/test2.txt

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+6 4
+0 -1 0 0 0 0
+-1 0 0 0 0 0
+0 0 0 0 0 0
+0 0 0 0 0 1

백준 7576번 토마토/test2_answer.txt

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+-1

백준 7576번 토마토/test3.txt

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+6 4
+1 -1 0 0 0 0
+0 -1 0 0 0 0
+0 0 0 0 -1 0
+0 0 0 0 -1 1

백준 7576번 토마토/test3_answer.txt

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+6

백준 7576번 토마토/test4.txt

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+5 5
+-1 1 0 0 0
+0 -1 -1 -1 0
+0 -1 -1 -1 0
+0 -1 -1 -1 0
+0 0 0 0 0

백준 7576번 토마토/test4_answer.txt

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+14

백준 7576번 토마토/test5.txt

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+2 2
+1 -1
+-1 1