Submission #83536

#	Time	Username	Problem	Language	Result	Execution time	Memory
83536		laptop_recai	Combo (IOI18_combo)	C++11	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int N) {
    int k;
    char first;
    string S,button,p;

    k = press("AB");
    if(k == 2)
        first = 'A';
    else if(k == 1) {
        if(press("A") == 1)
            first = 'A', button = "BXY";
        else
            first = 'B', button = "AXY";
    }
    else {
        if(press("X") == 1)
            first = 'X', button = "ABY";
        else
            first = 'Y', button = "ABX";
    }

    S = first;

    fori(i,1,N-1) {
        p = (S + button[0]) + (S + button[1] + button[0]) + (S + button[1] + button[1]) + (S + button[1] + button[2]);
        k = press(p);
        if(k == i)
            S += button[2];
        else if(k == i+1)
            S += button[0];
        else
            S += button[1];
    }

    k = press(S + button[0] + S + button[1]);

    if(press(S + button[0]) == N)
        S += button[0];
    else if (press(S + button[1]) == N)
        S += button[1];
    else
        S += button[2];

    return S;
}

Compilation message (stderr)

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