420. Number Permutations
Time limit per test: 0.75
Memory limit: 262144
Two distinct positive integer numbers with decimal notations of the same length are called similar
, if their decimal notations can be obtained from each other by permuting the digits.
How many numbers from the segment [l, r
] have exactly one similar number in that segment?
The input file contains two integer numbers l
(1 ≤ l
Output one integer number — the sought amount.