Question

How to check if a number and its double contain exactly the same digits in C++

Answer 1

#include <algorithm>
#include <iostream>
#include <string>

bool same_digits_double_number(int n) {
    std::string s1 = std::to_string(n);
    std::string s2 = std::to_string(n * 2);
    
    std::sort(s1.begin(), s1.end());
    std::sort(s2.begin(), s2.end());
    
    return s1 == s2;
}

int main() {
    int n = 125874;
    
    std::cout << std::boolalpha << same_digits_double_number(n);
}




/*
run:

true

*/

 

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