2376. Count Special Integers

LeetCodeMathDynamic ProgrammingOpen on judge ↗

We call a positive integer special if all of its digits are distinct. Given a positive integer n, return the number of special integers that belong to the interval [1, n]. Example 1: Input: n = 20 Output: 19 Explanation: All the integers from 1 to 20, except 11, are special. Thus, there are 19 special integers. Example 2: Input: n = 5 Output: 5 Explanation: All the integers from 1 to 5 are

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solution.cppC++17

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