array

#include <iostream>
#include <thread>
#include <vector>
#include <mutex>
#include <chrono>
#include <algorithm>
#include <ctime>
#include <random>

// Сегодня день веселой многопоточности

std::mutex mut;

void worker(int* vct, int q, int pos, short thr_num)
{

        for (int i = pos; i < pos + q; ++i)
        {
                if (vct[i] % 2 != 0)
                        vct[i] = 0;
        }
}

int main(int argc, char* argv[])
{
//      std::vector<int> resint
        int* result  = new int[100000000];
        srand(time(0));
        std::generate(result, result + 100000000, std::rand);
        int quart = 100000000 / 4;
        auto beg = std::chrono::steady_clock::now();
        std::thread work_thread_0(worker, std::ref(result), quart, quart * 0, 0);
        std::thread work_thread_1(worker, std::ref(result), quart, quart * 1, 1);
        std::thread work_thread_2(worker, std::ref(result), quart, quart * 2, 2);
        std::thread work_thread_3(worker, std::ref(result), quart, quart * 3, 3);
        work_thread_0.join();
        work_thread_1.join();
        work_thread_2.join();
        work_thread_3.join();
        auto end = std::chrono::steady_clock::now();
        delete[] result;
        std::cout << "Elapsed time in seconds: " << std::chrono::duration_cast<std::chrono::milliseconds> (end - beg).count() << '\n';
        return 0;
}