๋ฌธ์
https://www.acmicpc.net/problem/1018
ํ์ด
n, m = map(int, input().split())
l = []
mini = []
for _ in range(n):
l.append(input())
for a in range(n - 7):
for i in range(m - 7):
idx1 = 0
idx2 = 0
for b in range(a, a + 8):
for j in range(i, i + 8): # 8X8 ๋ฒ์๋ฅผ B์ W๋ก ๋ฒ๊ฐ์๊ฐ๋ฉด์ ๊ฒ์ฌ
if (j + b)%2 == 0:
if l[b][j] != 'W': idx1 += 1
if l[b][j] != 'B': idx2 += 1
else :
if l[b][j] != 'B': idx1 += 1
if l[b][j] != 'W': idx2 += 1
mini.append(idx1) # W๋ก ์์ํ์ ๋ ์น ํด์ผ ํ ๋ถ๋ถ
mini.append(idx2) # B๋ก ์์ํ์ ๋ ์น ํด์ผ ํ ๋ถ๋ถ
print(min(mini)) # ์น ํด์ผ ํ๋ ๊ฐ์์ ์ต์๊ฐ
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