Подсчитать количество строк

#include<iostream>
#include<map>
#include<sstream>
#include<vector>
#include<fstream>
using namespace std;
 
int main(){
    string s="for while if break goto continue return";
    vector<string> tok;
    stringstream ss(s);
    while(ss>>s) tok.push_back(s);
    vector<map<int, int> > maps(tok.size());
    cout<<"source file path= ";
    cin>>s;
    fstream fs(s.c_str());
    if(!fs){cerr<<"file not found"; return 1;}
    int num=0;
    while(getline(fs, s)){
        for(int i=0; i<tok.size(); i++){
            int ind=0;
            while((ind=s.find(tok[i], ind))!=string::npos){
                maps[i][num]++;
                ind+=tok[i].size();
            }
        }
        ++num;
    }
    fs.close();
    cout<<"\nresult file path= ";
    cin>>s;
    fs.open(s.c_str(), ios::out);
    for(int i=0; i<tok.size(); i++){
        fs<<"\n"<<tok[i]<<": \n";
        cout<<"\n"<<tok[i]<<": \n";
        for(map<int, int>::iterator it=maps[i].begin(); it!=maps[i].end(); ++it){
            fs<<"line= "<<it->first+1<<"    "<<it->second<<"  times\n";
            cout<<"line= "<<it->first+1<<"    "<<it->second<<"  times\n";
        }
    }
    fs.close();
}

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <map>
int main(int argc, char *argv[]) {
  if (argc != 2) {
    std::cout << "Usage: " << argv[0] << " <filename>" << std::endl;
    return 0;
  }
 
  std::ifstream infile(argv[1]);
  char buffer[4096];
  int line_number = 1;
  std::map< std::string, std::map<int, int> > result;
  while (infile.good()) {
    infile.getline(buffer, 4096);
    std::stringstream line(buffer);
    std::string word;
    while (line >> word) {
      //std::cout << line_number << ": " << word << std::endl;
      if (word == "for" || word == "while" || word == "if" || word == "break"
          || word == "goto" || word == "continue" || word == "return")
        ++result[word][line_number];
    }
    ++line_number;
  }
 
  for (std::map< std::string, std::map<int, int> >::iterator keyword = result.begin();
       keyword != result.end(); ++keyword) {
    std::cout << (*keyword).first << " (" << (*keyword).second.size() << "): ";
    for (std::map<int, int>::iterator keyline = (*keyword).second.begin();
         keyline != (*keyword).second.end(); ++keyline)
      std::cout << "line " << (*keyline).first << " - " << (*keyline).second << "; ";
   std::cout << std::endl;
  }
  return 0;
}