C++ Solution to find non matched numbers

/* Does same as java solution but in c++

Test file  for you

85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  35
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  86  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85
85  85  85  85  85  85  85  85  85  85

*/


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

class FileToArray {
private:
    std::vector<std::vector<int>> array;

public:
    FileToArray(const std::string& filePath) {
        std::ifstream inputFile(filePath);

        if (!inputFile.is_open()) {
            std::cerr << "Error: Could not open file" << std::endl;
            return;
        }

        array.resize(20, std::vector<int>(10));

        std::string line;
        std::getline(inputFile, line);

        std::istringstream lineStream(line);
        int value;
        for (int i = 0; i < 20; i++) {
            for (int j = 0; j < 10; j++) {
                if (lineStream >> value) {
                    array[i][j] = value;
                } else {
                    std::cerr << "Error: Not enough data in the file." << std::endl;
                    inputFile.close();
                    return;
                }
            }
        }

        inputFile.close();
    }

    void compareAndPrintMismatches(int selectedNumber) {
        for (int row = 0; row < 20; row++) {
            for (int col = 0; col < 10; col++) {
                int number = array[row][col];
                if (number != selectedNumber) {
                    std::cout << "Mismatch: Row " << (row + 1) << ", Column " << (col + 1) << " - Value: " << number << std::endl;
                }
            }
        }
    }

    int countElements() {
        return 20 * 10;
    }

    void exportToFile(const std::string& outputPath, const std::string& delimiter) {
        std::ofstream outputFile(outputPath);

        if (!outputFile.is_open()) {
            std::cerr << "Error: Could not open output file" << std::endl;
            return;
        }

        for (int row = 0; row < 20; row++) {
            for (int col = 0; col < 10; col++) {
                outputFile << array[row][col];
                if (col < 9) {
                    outputFile << delimiter;
                }
            }
            outputFile << "\n";
        }

        outputFile.close();
    }
};

int main() {
    std::string inputFilePath = "numbers.txt"; // Change this to the path of your input file
    FileToArray fileToArray(inputFilePath);

    int selectedNumber = 85; // Change this to the number you want to compare

    fileToArray.compareAndPrintMismatches(selectedNumber);

    int elementCount = fileToArray.countElements();
    std::cout << "Total number of elements in the array: " << elementCount << std::endl;

    std::string outputFilePath = "output.txt"; // Change this to the desired output file path
    std::string delimiter = "\t"; // Change this to the desired delimiter
    fileToArray.exportToFile(outputFilePath, delimiter);

    return 0;
}