将字符串进行排序
include [HTML_REMOVED]
include [HTML_REMOVED]
using namespace std;
int a[1010],T,n;
string s;
int main()
{
cin>>T;
for(int i=1;i<=T;i++)
{
cin>>n;
cin>>s;
sort(s.begin(),s.end());
cout<<s<<endl;
}
return 0;
}`