Solution.py

class Solution:
    def strongPasswordChecker(self, password: str) -> int:
        def countTypes(s):
            a = b = c = 0
            for ch in s:
                if ch.islower():
                    a = 1
                elif ch.isupper():
                    b = 1
                elif ch.isdigit():
                    c = 1
            return a + b + c

        types = countTypes(password)
        n = len(password)
        if n < 6:
            return max(6 - n, 3 - types)
        if n <= 20:
            replace = cnt = 0
            prev = '~'
            for curr in password:
                if curr == prev:
                    cnt += 1
                else:
                    replace += cnt // 3
                    cnt = 1
                    prev = curr
            replace += cnt // 3
            return max(replace, 3 - types)
        replace = cnt = 0
        remove, remove2 = n - 20, 0
        prev = '~'
        for curr in password:
            if curr == prev:
                cnt += 1
            else:
                if remove > 0 and cnt >= 3:
                    if cnt % 3 == 0:
                        remove -= 1
                        replace -= 1
                    elif cnt % 3 == 1:
                        remove2 += 1
                replace += cnt // 3
                cnt = 1
                prev = curr
        if remove > 0 and cnt >= 3:
            if cnt % 3 == 0:
                remove -= 1
                replace -= 1
            elif cnt % 3 == 1:
                remove2 += 1
        replace += cnt // 3
        use2 = min(replace, remove2, remove // 2)
        replace -= use2
        remove -= use2 * 2

        use3 = min(replace, remove // 3)
        replace -= use3
        remove -= use3 * 3
        return n - 20 + max(replace, 3 - types)