greedy : 7.문자열 뒤집기

# 7. 문자열 뒤집기

s = input("문자열을 입력해주세요: ")
count_0 = 0
count_1 = 0

if s[0] == '0':
    count_0 += 1
else:
    count_1 += 1

for i in range(len(s)-1):
    if s[i] != s[i+1]:
        if s[i+1] == '0':
            count_0 += 1
        else:
            count_1 += 1
print(min(count_0, count_1))​