Submission #53417031

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Source Code Expand

#include <iostream>
#include <string>
using namespace std;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int N;
    cin >> N;

    string S;
    cin >> S;

    string answer;
    for (int i = int(S.size()) - 1; i >= 0; i--) {
        if (S[i] == '1') {
            answer += string(i + 1, 'A');
            answer += string(i, 'B');
        }
    }

    cout << answer.size() << "\n";
    cout << answer << "\n";
    return 0;
}

Submission Info

Judge Result