include [HTML_REMOVED]

include [HTML_REMOVED]

include [HTML_REMOVED]

include [HTML_REMOVED]

include [HTML_REMOVED]

using namespace std;
int main(){
string op = “abc”;
op += “usi”;
cout<<op<<endl;
op += ‘p’;
cout<<op<<endl;
cout<<op.substr(2)<<endl;
cout<<op.substr(2,3)<<endl;
cout<<op.substr(2,100)<<endl;

return 0;

}