HW1A

#include <iostream>
using namespace std;

int strlen(int N) {
    int len = 1;
    for (int i = 0; i < N - 1; i++) {
        len = 1 + 2 * len;
    }
    return len;
}

int place(int K, int len, int N) {
    if (K == 1) {
        return N;
    }

    if (K <= (len + 1) / 2) {
        K--;
        len = len - (len + 1) / 2;
        N--;
        return place(K, len, N);
    }

    if (K > (len + 1) / 2) {
        K = K - ((len + 1) / 2);
        len = len - (len + 1) / 2;
        N--;
        return place(K, len, N);
    }
}

int main()
{
    int N, K, L, i = 0;
    cin >> N >> L >> K;

    int len = strlen(N);

    for (i = L; i <= K; i++) {
        cout << (char)(96 + place(i, len, N));
    };

}