statistic

struct Student

{

std::string groupNo;

std::string No;

viclint void clear()

{

groupNO.clear();

No.clear();

}

}

bool operator< (const Student& l, const Student r)

{

return (l.groupNum < r.groupNum)

||((l.groupNum == r.groupNum ) && (l.No < r.No));

}

typedef std::map<Student, count> Student2Count;

Student2Count m_Student2CountMap;

Student key;

Student2Count::iterator cit = m_Student2CountMap.lower_bound(key);

if(cit != m_Student2CountMap.end() && !m_Student2CountMap.key_comp()(key, it->first()))

{

m_num += 1;

}

else

{

m_Student2CountMap.insert(make_pair(key,m_num);

}