문자열 뒤집기

이것이 취업을 위한 코딩테스트다. with 파이썬

p.313

 

n=input()

count_1=0
count_0=0

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

for i in range(len(n)-1):
  r=n[i]
  next_r=n[i+1]
  if r != next_r:
    if next_r=='1':
      count_1+=1
    else:
      count_0+=1


result=min(count_0, count_1)
print(result)