如何通过C++开发高效的大数据处理程序？

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> data = {4, 2, 7, 5, 1, 3};
    std::sort(data.begin(), data.end());

    for (const auto& element : data) {
        std::cout << element << " ";
    }

    return 0;
}

#include <iostream>
#include <vector>
#include <thread>

// 计算每个元素的平方并累加
void calculate(std::vector<int>& data, int start, int end, int& sum) {
    for (int i = start; i < end; ++i) {
        sum += data[i] * data[i];
    }
}

int main() {
    std::vector<int> data = {1, 2, 3, 4, 5};
    int sum = 0;

    int numThreads = std::thread::hardware_concurrency(); // 获取CPU支持的最大线程数
    std::vector<std::thread> threads;

    int blockSize = data.size() / numThreads; // 每个线程计算的元素个数

    // 创建多个线程并行计算
    for (int i = 0; i < numThreads; ++i) {
        threads.emplace_back(calculate, std::ref(data), i * blockSize, (i + 1) * blockSize, std::ref(sum));
    }

    // 等待所有线程执行完毕
    for (auto& thread : threads) {
        thread.join();
    }

    std::cout << "Sum of squares: " << sum << std::endl;

    return 0;
}

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<std::string, int> frequency;
    std::string word;

    while (std::cin >> word) {
        ++frequency[word];
    }

    for (const auto& pair : frequency) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}