ABCDE * 4 = EDCBA

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

/*
    ABCDE * 4 = EDCBA
*/

int main() {
    ostringstream ss;

    int limit = 100000;

    for (int i = 10000; i < limit; i++) {
        int i4 = i * 4;

        if (i4 >= limit) break;

        ss << i;
        string is = ss.str(); //string i
        ss.str("");

        string isr = ""; //string i, reversed
        for (int x = is.length() - 1; x >= 0; x--) {
            isr += is.at(x);
        }

        ss << i4;
        string i4s = ss.str(); //string i4
        ss.str("");

        cout << "i:" << i << " 4*i:" << i4 << " ir:" << isr << endl;

        if (i4s == isr) {
            cout << "Najdeno! " << i << endl;
            break;
        }
    }
}

/*
int i
string i
int i4 = i * 4
string i4
proveri dali i4 == i.reverse()
*/