C++ビッグデータ開発における欠落データの問題を解決するにはどうすればよいですか?

#include <iostream>
#include <fstream>
#include <cstdlib>

void backupData(const std::string& source, const std::string& target) {
    std::ifstream ifs(source, std::ios::binary);
    std::ofstream ofs(target, std::ios::binary);

    if (ifs && ofs) {
        ofs << ifs.rdbuf();
        std::cout << "Backup data successfully!" << std::endl;
    }
    else {
        std::cerr << "Failed to backup data!" << std::endl;
    }
}

int main() {
    std::string source = "data.txt";
    std::string target = "backup_data.txt";

    backupData(source, target);

    return 0;
}

#include <iostream>
#include <fstream>
#include <stdexcept>

void restoreData(const std::string& filename) {
    std::ifstream ifs(filename);

    if (!ifs) {
        throw std::runtime_error("Failed to restore data!");
    }

    // 恢复数据的逻辑

    std::cout << "Data restored successfully!" << std::endl;
}

int main() {
    std::string filename = "data.txt";

    try {
        restoreData(filename);
    }
    catch (const std::exception& e) {
        std::cerr << "Exception caught: " << e.what() << std::endl;
    }

    return 0;
}

#include <iostream>
#include <fstream>
#include <vector>
#include <numeric>

bool checkData(const std::string& filename) {
    std::ifstream ifs(filename, std::ios::binary);

    if (!ifs) {
        std::cerr << "Failed to open file: " << filename << std::endl;
        return false;
    }

    std::vector<char> data((std::istreambuf_iterator<char>(ifs)),
                            std::istreambuf_iterator<char>());

    // 计算校验和
    unsigned int checksum = std::accumulate(data.begin(), data.end(), 0);

    std::cout << "Checksum: " << checksum << std::endl;

    // 检查是否与保存的校验和一致

    return true;
}

int main() {
    std::string filename = "data.txt";

    if (checkData(filename)) {
        std::cout << "Data is valid." << std::endl;
    }
    else {
        std::cout << "Data is invalid." << std::endl;
    }

    return 0;
}