Sort Number's Digits with C++

//Trần Việt Anh - 11/10/2018 - 8:45PM
#include<iostream>
using namespace std;

string sorted(string s)
{
    for (int i = 0; i < s.length() - 1; i++)
        for (int j = i + 1; j < s.length(); j++)
            if (s[i] > s[j])
            {
                char mid = s[i];
                s[i] = s[j];
                s[j] = mid;
            }
    return s;
}

int main()
{
    int n; cin >> n;
    for (int i = 0; i < n; i++)
    {
        string s; cin >> s;
        cout << sorted(s) << endl;
    }
    return 0;
}