Question

How to get the total numbers with no repeated digits from a range of two digit numbers in C++

Answer 1

#include <iostream>
#include <cmath>

int GetTotalNumbersWithNoRepeatedTwoDigits(int start, int end) {
    int total_digits_minus_one = 1;
    
    int total = 0;
    for (int i = start; i <= end; i++) {
        int first_digit = (int)(i / pow(10, total_digits_minus_one));
        int last_digit = i % 10;
        
        if (first_digit != last_digit) {
            total++;
        }
    }
    
    return total;
}

int main()
{
    int start = 10, end = 45;
    
    std::cout << GetTotalNumbersWithNoRepeatedTwoDigits(start, end);
}




/*
run:

32

*/

 

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