TopCoder SRM 144 Division 2 200 points problem.

SRM_144_Div2_200.cpp

#include <vector>
#include <string>
#include <sstream>

using std::vector;
using std::string;
using std::stringstream;

class Time {
 public:
  string whatTime(int seconds) {
    int hh = seconds / 3600;
    int mm = (seconds % 3600) / 60;
    int ss = (seconds % 3600) % 60; 
    
    stringstream st;
    
    st << hh << ":" << mm << ":" << ss;
    
    return st.str();  
  }
};