正確例題

#include<iostream>

using namespace std;

int main()

{

    cout << "\033[30;31;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;32;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;33;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;34;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;35;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;36;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;37;4m" <<  "■■" <<  "\033[0m" << endl;

    cout << "\033[30;38;4m" <<  "■■" <<  "\033[0m" << endl;

    return 0;

}