Submission #401517

#	Time	Username	Problem	Language	Result	Execution time	Memory
401517		tredsused70	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int n)
{
    string ans,help;
    char st;
    if(press("AX"))
    {
        if(press("A")==1)
            ans="A";
        else
            ans="X";
    }
    else
    {
        if(press("B")==1)
            ans="B";
        else
            ans="Y";
    }
    st=ans[0];
    for(int i=1;i<n;i++)
    {
        help=ans+"A";
        help+=ans+"B";
        if(press(help)==i+1)
        {
            if(press(ans+"A")==i+1)
                ans+="A";
            else
                ans+="B";
        }
        else
        {
            if(press(ans+"X")==i+1)
                ans+="X";
            else
                ans+="Y";
        }
        help.clear();
    }
    return ans;
}

Compilation message (stderr)

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