num_with_repeated_digit.py (860B)
| # 1012. Numbers With Repeated Digits
from math import perm
"""
given an integer 'n', return the number of positive integers in range '[1,
n]' that have at least one repeated digit.
"""
class Solution(object):
def numDupDigitsAtMostN(self, n):
"""
:type n: int
:rtype: int
"""
l = list(map(int, str(n + 1)))
m = len(l)
ans = sum(9 * perm(9, i) for i in range(m - 1))
s = set()
for i, j in enumerate(l):
for k in range(i == 0, j):
if not k in s:
ans += perm(9 - i, n - i - 1)
if j in s:
break
s.add(j)
return n - ans
if __name__ == "__main__":
obj = Solution()
print(obj.numDupDigitsAtMostN(20))
print(obj.numDupDigitsAtMostN(100))
print(obj.numDupDigitsAtMostN(1000))
|
