Submission #866692

#	Time	Username	Problem	Language	Result	Execution time	Memory
866692		vjudge1	콤보 (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int n){
    vector<char>buttons = {'A','B','X','Y'};
    char starting_char = '0';
    if(press("AB")){
        if(press("A"))
            starting_char = 'A';
        else
            starting_char = 'B';
    }
    else{
        if(press("X"))
            starting_char = 'X';
        else
            starting_char = 'Y';
    }
    string ans{starting_char};
    buttons.erase(find(buttons.begin(), buttons.end(), starting_char));

    // s + B + s + XY + s + XB + s + XX -> if starting_char == A
    for(int i = 1; i < n - 1; ++i){
        int current_coins = press(ans + string{buttons[0]} + ans + string{buttons[1],buttons[0]} + ans
                                   + string{buttons[1], buttons[1]} + ans + string{buttons[1], buttons[2]});
        if(current_coins == i)
            ans.push_back(buttons[2]);
        else if(current_coins == i + 1)
            ans.push_back(buttons[0]);
        else if(current_coins == i + 2)
            ans.push_back(buttons[1]);
    }

    if(press(ans + string{buttons[0], buttons[1]}) == n){
        if(press(ans + string{buttons[0]}) == n)
            ans.push_back(buttons[0]);
        else
            ans.push_back(buttons[1]);

    }
    else{
        ans.push_back(buttons[2]);
    }
    return ans;


}

Compilation message (stderr)

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