Submission #862942

#	Time	Username	Problem	Language	Result	Execution time	Memory
862942		HataNoKokoro	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int N)
{
    string result = "";
    int coin;
    
    ///ask first char
    coin = press("AB");
    if(coin == 0)
    {
        c_list[0] = 'A';
        c_list[1] = 'B';
        result += (press("X") ? 'X' : 'Y');
        c_list[2] = (result[0] == 'X' ? 'Y' : 'X');
    }
    else
    {
        result += (press("A") ? 'A' : 'B');
        c_list[0] = (result[0] == 'A' ? 'B' : 'A');
        c_list[1] = 'X';
        c_list[2] = 'Y';
    }
    
    ///ask 2 -> n-1 char
    for(int i = 2; i < N; i++)
    {
        coin = press(result + c_list[0] + c_list[0] + result + c_list[0] + c_list[1]
             +result + c_list[0] + c_list[2] + result + c_list[1]);
        if(coin == i + 1)
            result += c_list[0];
        else if(coin == i)
            result += c_list[1];
        else result += c_list[2];
    }

    ///ask n char
    coin = press(result + c_list[0] + result + c_list[1]);
    if(coin == N)
        return (press(result + c_list[0]) == N ? result + c_list[0] : 
                                                 result + c_list[1]);
    return result + c_list[2];
}

Compilation message (stderr)

combo.cpp:1:1: error: 'string' does not name a type
    1 | string guess_sequence(int N)
      | ^~~~~~