20.16 через класс

#include <iostream>
#include <ctime>
class twoDimArr {
    int **arr, rows, cols;
public:
    twoDimArr(const int rows, const int cols) {
        this->rows = rows;
        this->cols = cols;
        this->arr = new int*[rows];
        for (int i = 0; i < rows; i++) {
            arr[i] = new int[cols];
        }
    }
    void FillArray() {
        char answer;
        do {
            std::cout << "Указать элементы матрицы вручную?(y/n) ";
            std::cin >> answer;
            if (answer != 'y' && answer != 'n') {
                std::cout << "Неверный ответ." << std::endl;
            }
        } while (answer != 'y' && answer != 'n');
        if (answer == 'y') {
            while (true) {
                for (int i = 0; i < rows; i++) {
                    for (int j = 0; j < cols; j++) {
                        std::cout << "Введите элемент " << i + 1 << ", " << j + 1 << " матрицы ";
                        std::cin >> arr[i][j];
                    }
                }
                for (int i = 0; i < rows; i++) {
                    for (int j = 0; j < cols; j++) {
                        std::cout << arr[i][j] << "\t";
                    }
                    std::cout << std::endl;
                }
                do {
                    std::cout << "Матрица составлена верно?(y/n) ";
                    std::cin >> answer;
                    if (answer != 'y' && answer != 'n') {
                        std::cout << "Неверный ответ." << std::endl;
                    }
                } while (answer != 'y' && answer != 'n');
                if (answer == 'y') {
                    break;
                }
                else {
                    continue;
                }
            }
        }
        else if (answer == 'n') {
            for (int i = 0; i < rows; i++) {
                for (int j = 0; j < cols; j++) {
                    arr[i][j] = 1 + rand() % (cols*rows * 2);
                }
            }
            for (int i = 0; i < rows; i++) {
                for (int j = 0; j < cols; j++) {
                    for (int k = 0; k < rows; k++) {
                        for (int l = 0; l < cols; l++) {
                            if (i == k && j == l) {
                                continue;
                            }
                            if (arr[i][j] == arr[k][l]) {
                                arr[i][j] = 1 + rand() % (cols*rows * 2);
                                k = -1;
                                i = 0;
                                j = 0;
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
    void ShawArray() {
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                std::cout << arr[i][j] << "\t";
            }
            std::cout << std::endl;
        }
    }
    void Transpose() {
        int **transposeArr = new int*[cols];
        for (int i = 0; i < cols; i++) {
            transposeArr[i] = new int[rows];
        }
        for (int i = 0; i < cols; i++) {
            for (int j = 0; j < rows; j++) {
                transposeArr[i][j] = arr[j][i];
            }
        }
        for (int i = 0; i < rows; i++) {
            delete[]arr[i];
        }
        delete[]arr;
        this->arr = transposeArr;
        int temp = rows;
        this->rows = cols;
        this->cols = temp;
    }
    twoDimArr(const twoDimArr &object) {
        this->cols = object.cols;
        this->rows = object.rows;
        this->arr = new int*[object.rows];
        for (int i = 0; i < object.rows; i++) {
            arr[i] = new int[object.cols];
        }
    }
    ~twoDimArr() {
        for (int i = 0; i < rows; i++) {
            delete[]arr[i];
        }
        delete[]arr;
        arr = nullptr;
    }
};
int main() {
    setlocale(LC_ALL, "ru");
    srand(time(NULL));
    int rows, cols;
    std::cout << "Введите количество строк: ";
    std::cin >> rows;
    std::cout << "Введите количество столбцов: ";
    std::cin >> cols;
    twoDimArr a(rows, cols);
    twoDimArr b(a);
    a.FillArray();
    a.ShawArray();
    a.Transpose();
    std::cout << "Транспонированная матрица: " << std::endl;
    a.ShawArray();
    b.FillArray();
    std::cout << "Матрица 1:" << std::endl;
    a.ShawArray();
    std::cout << "Матрица 2:" << std::endl;
    b.ShawArray();
    return 0;
}