В заданном целочисленном массиве исключить элементы, которые встречаются больше заданного количества раз

#include <iostream>
#include <vector>
#include <unordered_map>
 
int main() {
 
    int NumberMore;
    std::cout << " Input number = "; std::cin >> NumberMore;
    
    std::vector <int> vec { 3, 5, -7, 7, 5, -9, 3, -9, 5, -9, -4, 5, 7, 5, -9, 3 };
 
    for (const int El : vec)
        std::cout << El << " ";
    std::cout << std::endl;
 
    std::unordered_map<int, int> mmap;
    for (int n : vec)
        mmap[n] += 1;
 
    for (auto it = mmap.begin(); it != mmap.end(); ++it)
        std::cout << it->first << " ---> " << it->second << '\n';
 
    std::cout << std::endl;
    std::cout << std::endl;
 
    auto it = mmap.begin();
    while (it != mmap.end())
    {
        if ((*it).second > NumberMore)
        {       
            mmap.erase(it++);
        }
        else
            ++it;
    }
 
    for (auto it = mmap.begin(); it != mmap.end(); ++it)
        std::cout << it->first << " ---> " << it->second << '\n';
 
    system("pause");
}

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