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# 2264. Largest 3-Same-Digit Number in String
"""
given a string 'num' representing a large integer, an integer is good if it
meets the following conditions: if it is a substring of 'num' with length
'3', it consists of only one unique digit. return the maximum good integer as
a string or an empty string "" if no such integer.
"""
class Solution(object):
def largestGoodInteger(self, num):
"""
:type num: str
:rtype: str
"""
ans = ""
empty = ""
tmp = 0
check = True
for i in range(len(num) - 2):
if i + 2 < len(num) and num[i] == num[i + 1] == num[i + 2]:
tmp = max(tmp, int(num[i]))
check = False
if not check:
ans += str(tmp) * 3
else:
return empty
return ans
if __name__ == "__main__":
obj = Solution()
print(obj.largestGoodInteger("6777133339")) # expect: 777
print(obj.largestGoodInteger("2300019")) # expect: 000
print(obj.largestGoodInteger("42352338")) # expect: NULL
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