Envío 2008

Código

#include <iostream>
using namespace std;

int main(void)
{
    string word;
    bool isRepeated = false;

    cin >> word;
    for (int i = 0; word[i]; i++)
    {
        for (int j = i + 1; word[j]; j++)
        {
            if (word[i] == word[j])
            {
                isRepeated = true;
                break;
            }
        }

        if (isRepeated)
            break;
    }

    cout << (isRepeated ? "yes" : "no") << endl;

    return 0;
}