UVA 10062 - Tell me the frequencies!

 #include <iostream>
 #include <string>
 #include <vector>
 #include <map>
 #include <algorithm>
 
 using namespace std;
 
 class Freq{
  public:
   Freq(char ansii, int count){
     this->ansii = ansii;
     this->count = count;
   }
   char ansii;
   int count;
 };
 
 bool FreqCompare (const Freq &a, const Freq &b){
   if (a.count!=b.count){
     return a.count<b.count;
   } else {
     return a.ansii>b.ansii;
   }
 }
 
 int main(int argc, char *argv[]){
   map<char, int> m;
   map<char, int>::iterator it;
   vector<Freq> freq;
   string line;
   bool firstTime=true;
   while (getline(cin, line)){
     m.clear();
     freq.clear();
     
     for (int i=0; i<line.size(); ++i){
       it = m.find(line[i]);
       (it == m.end()) ? m[line[i]]=1 : m[line[i]]++;  
    }
    
    for (it=m.begin(); it!=m.end(); ++it){
      freq.push_back(Freq(it->first, it->second));
    }

    sort(freq.begin(), freq.end(), FreqCompare);
    firstTime ? firstTime=false : cout << endl ;
    for (int i=0; i<freq.size(); ++i){
      cout << (size_t) freq[i].ansii << " " << freq[i].count << endl;
    }
  }
  return 0;
}