C++将向量的多个2D向量写入文本文件并多次迭代更新

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

void writeVectorsToFile(const std::vector<std::vector<int>>& vectors, const std::string& filename) {
    std::ofstream file(filename);
    if (file.is_open()) {
        for (const auto& vector : vectors) {
            for (const auto& element : vector) {
                file << element << " ";
            }
            file << std::endl;
        }
        file.close();
        std::cout << "Vectors have been written to the file." << std::endl;
    } else {
        std::cout << "Unable to open the file." << std::endl;
    }
}

void updateVectors(std::vector<std::vector<int>>& vectors) {
    for (auto& vector : vectors) {
        for (auto& element : vector) {
            element += 1;
        }
    }
}

int main() {
    std::vector<std::vector<int>> vectors = {{1, 2}, {3, 4}, {5, 6}};

    // 将向量写入文件
    writeVectorsToFile(vectors, "vectors.txt");

    // 迭代更新向量
    for (int i = 0; i < 3; i++) {
        updateVectors(vectors);
    }

    // 将更新后的向量再次写入文件
    writeVectorsToFile(vectors, "updated_vectors.txt");

    return 0;
}