size_t lines, columns; // [0; 2 ** 64 - 1] такой же диапазон, как у uint64_t
    std::cin >> lines >> columns;

    std::string s;

    int** table = new int*[lines];
    for (size_t line = 0; line < lines; ++line) {
        table[line] = new int[columns]{0};
    }

    int current_number = 0;

    for (size_t diagonal_index = 0; diagonal_index < lines + columns - 1; ++diagonal_index) {
        for (size_t line = 0; line < lines; ++line) {
            if (diagonal_index - line < columns && diagonal_index - line >= 0) {
                table[line][diagonal_index - line] = current_number;
                ++current_number;
            }
        }
    }

    for (size_t line = 0; line < lines; ++line) {
        for (size_t column = 0; column < columns; ++column) {
            std::cout << table[line][column] << "\t";
        }
        std::cout << "\n";
    }

    for (size_t line = 0; line < lines; ++line) {
        delete[] table[line];
    }

    delete[] table;