052.cpp

#include <iostream>
#include <set>
using namespace std;
unsigned sort_digits(unsigned x)
{
        multiset<int> nos;
        for (unsigned k=x;k>0;k/=10)
                nos.insert(k%10);

        unsigned sorted_num = 0;
        for (multiset<int>::iterator p=nos.begin();p!=nos.end();p++)
                sorted_num= sorted_num*10+*p;
        return sorted_num;
}

int main()
{
        unsigned x;
        for (x=1;x!=0;x++) {
                unsigned ref = sort_digits(x);
                if (ref == sort_digits(2*x) &&
                        ref == sort_digits(3*x) &&
                        ref == sort_digits(4*x) &&
                        ref == sort_digits(5*x) &&
                        ref == sort_digits(6*x) )
                        break;
        }
        cout << x << endl;
        return 0;
}