Envío 6975

Código

#include <iostream>
#include <cassert>

using namespace std;

int main() {
    string text;
    int textLenght = 50;
    cin >> text;

    assert(text.length() <= textLenght);
    bool repeated = false;

    for (int i = 0; i <= text.length(); i++) {
        for (int j = i + 1; j < text.length(); j++) {
            if (text[i] == text[j]) {
                repeated = true;
                break;
            }
        }

        if (repeated) {
            break;
        }
    }
    
    if (repeated) {
        cout << "yes" << endl;
    } else {
        cout << "no" << endl;
    }

    return 0;
}