Подсчитать количество заданных слов в тексте

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
#include <iostream>
#include <string>
#include <fstream>
#include <tchar.h>
//---------------------------------------------------------------------------
 
#pragma argsused
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    setlocale(LC_ALL, "Russian");
 
    int k;
    ifstream file("C:/Users/adm/1.txt");
    string s, find;
    char c;
 
    while (!file.eof()){
        file.get(c);
        s.push_back(c);
    }
 
    file.close();
 
    find = "что";
 
    int pos = s.find(find);
 
    if (pos == -1)
        cout << "not finded" << endl;
    else
        cout << "finded" << endl;
 
    system ("pause");
    return 0;
}

#include <string>
#include <iostream>
int main()
{
    int occurrences = 0;
    std::string::size_type pos = 0;
    std::string s = "что Тест что Тест что";
    std::string target = "что";
    while ((pos = s.find(target, pos)) != std::string::npos) {
        ++occurrences;
        pos += target.length();
    }
    std::cout << occurrences << std::endl;
 
    return 0;
}

#include <iostream>
#include <regex>
#include <string>
#include <fstream>
#include <iterator>
 
 
int main()
{
    std::ifstream ifs("in.txt");
    if (ifs.is_open())
    {
        std::string str{ std::istreambuf_iterator<char>{ifs.rdbuf()}, {} };
        std::regex reg{"(?:^|[^А-Яа-яЁё])[Чч]то(?:$|[^А-Яа-яЁё])"};
        std::cout << std::distance(std::sregex_iterator{ str.begin(), str.end(), reg }, {}) << std::endl;
    }
    else
    {
        std::cerr << "Unable to open file\n";
    }
}

#include <iostream>
#include <regex>
#include <string>
#include <fstream>
#include <iterator>
 
 
int main()
{
    std::ifstream ifs("in.txt");
    if (ifs.is_open())
    {
        std::string str{ std::istreambuf_iterator<char>{ifs.rdbuf()},{} }, sw("что");
        std::regex reg{ "(?:^|[^А-Яа-яЁё])" + sw + "(?:$|[^А-Яа-яЁё])" };
        std::cout << std::distance(std::sregex_iterator{ str.begin(), str.end(), reg }, {}) << std::endl;
    }
    else
    {
        std::cerr << "Unable to open file\n";
    }
}

#include <algorithm>
#include <iostream>
#include <string>
#include <queue>
 
using namespace std;
 
int main()
{
    string s("Your home is a box. Your car is a box on wheels. You drive to work in it. You drive home in it. You sit in your home, staring into a box. It erodes your soul, while the box that is your body inevitably withers... then dies. Whereupon it is placed in the ultimate box, to slowly decompose.");
    string w("box");
    int occurences = 0;
    deque<char> q;
    for (char ch : s) {
        q.push_back(ch);
        if (q.size() == w.size()) {
            if (equal(begin(q), end(q), begin(w))) ++occurences;
            q.pop_front();
        }
    }
    cout << occurences << endl;
    return 0;
}

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include <iostream>
#include <string>
#include <fstream>
#include <tchar.h>
//---------------------------------------------------------------------------
 
#pragma argsused
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    setlocale(LC_ALL, "Russian");
 
    int k, v=0, na=0;
    ifstream file("C:/Users/adm/1.txt");
    string s, find;
    char c;
 
    while (!file.eof()){
        file.get(c);
        s.push_back(c);
    }
 
    file.close();
 
    string::size_type pos = 0;
    string target = "в";
    while ((pos = s.find(target, pos)) != string::npos) {
        ++v;
        pos += target.length();
    }
    cout << "V texte naideno " << v << " slyjebnih slov " << target << endl;
 
    string target1 = "что";
    while ((pos = s.find(target1, pos)) != string::npos) {
        ++na;
        pos += target1.length();
    }
    cout << "V texte naideno " << na << " slyjebnih slov " << target1 << endl;
 
 
    system ("pause");
    return 0;
}
//---------------------------------------------------------------------------

#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>
#include <iterator>
 
int main()
{
    static const std::string filename{"ip.txt"};
    std::ifstream file{filename,std::ios_base::in};
    
    if(file.is_open())
    {
        std::cout<<distance(std::istream_iterator<std::string>{file}, std::istream_iterator<std::string>{})<<std::endl;
    } 
    else std::cerr<<"Error";
    
}