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# Time: O(n)

# Space: O(1)

class Solution(object):

def countBinarySubstrings(self, s):

"""

:type s: str

:rtype: int

"""

result, prev, curr = 0, 0, 1

for i in xrange(1, len(s)):

if s[i-1] != s[i]:

result += min(prev, curr)

prev, curr = curr, 1

else:

curr += 1

result += min(prev, curr)

return result