Найти количество вхождений заданного слова в строку

#include <bits/stdc++.h>
 
using namespace std;
 
void DeleteWord(const string& s, const string& delWord)
{
    vector<string> x;
    string word;
    int k = 0;
    stringstream str(s);
    while (str >> word)
    {
        if (word != delWord)
            x.push_back(word);
        else
            k++;
    }
    cout << "The string after deleting: " << "\n";
    for (int i = 0; i < x.size(); i++)
    {
        cout << x[i] << " ";
    }
    cout << "\n" 
         << "The number of words that were deleted: " << k << "\n";
}
 
int main()
{
    string s1, s2, delWord;
    cout << "Enter a string s1:" << "\n";
    getline(cin, s1);
    cout << "Enter a string s2:" << "\n";
    getline(cin, s2);
    cout << "Enter a word:" << "\n";
    getline(cin, delWord);
    cout << "Target info for s1:" << "\n";
    DeleteWord(s1, delWord);
    cout << "Target info for s2:" << "\n";
    DeleteWord(s2, delWord);
    cin.get();
    return 0;
}

#include <bits/stdc++.h>
 
int k;
 
using namespace std;
 
void PrintVector(vector<string>& x)
{
    cout << "The string after deleting:" << "\n";
    for (int i = 0; i < x.size(); i++)
    {
        cout << x[i] << " ";
    }
    cout << "\n"
         << "The number of words that were deleted: " << k << "\n";
}
 
void DeleteWord(const string& s, const string& delWord)
{
    vector<string> x;
    string word;
    k = 0;
    stringstream str(s);
    while (str >> word)
    {
        x.push_back(word);
    }
    for (int i = x.size() - 1; i >= 0; i--)
    {
        if (x[i] == delWord)
        {
            x.erase(x.begin() + i);
            k++;
        }
    }
    PrintVector(x);
}
 
int main()
{
    string s1, s2, delWord;
    cout << "Enter a string s1:" << "\n";
    getline(cin, s1);
    cout << "Enter a string s2:" << "\n";
    getline(cin, s2);
    cout << "Enter a word:" << "\n";
    getline(cin, delWord);
    cout << "Target info for s1:" << "\n";
    DeleteWord(s1, delWord);
    cout << "Target info for s2:" << "\n";
    DeleteWord(s2, delWord);
    cin.get();
    return 0;
}

#include <iostream>
#include <cstring>
#include <cctype>
 
size_t remove_words(char* s, const char* w){
    char*  i;
    size_t n = 0, m = strlen(w);
    for(char* p = s; *s; *s = *p){
        if(!isspace(*p)){
            i = p + 1;
            while(*i && !isspace(*i))
                ++i;
 
            if((static_cast<size_t>(i - p) == m) && !strncmp(p, w, m)){
                p = i;
                ++n;
            } else {
                while(p != i)
                    *s++ = *p++;
            }
        } else {
            ++s;
            ++p;
        }
    }
    return n;
}
 
int main(void){
    char s[] = "COM DCOM COM COM+ xCOMx COM COMCOM COM COM";
    char w[] = "COM";
 
    std::cout << s << std::endl;
 
    size_t n = remove_words(s, w);
    std::cout << s << std::endl;
    std::cout << "remove count word \"" << w << "\": " << n << std::endl;
    std::cin.get();
    return 0;
}