Submission #750138

#	Time	Username	Problem	Language	Result	Execution time	Memory
750138		vjudge1	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int n)
{
    string ans;
    int x = press("AB");
    if(x == 0){
        int se = press("X");
        if(se == 1) ans += "X";
        else ans += "Y";
    }
    else{
        int se = press("A");
        if(se == 1) ans += "A";
        else ans += "B";
    }
    vector<string> c;
    if(ans != "A") c.push_back("A");
    if(ans != "B") c.push_back("B");
    if(ans != "X") c.push_back("X");
    if(ans != "Y") c.push_back("Y");
    int i = 1;
    while(i < n){
        if(i == n-1){
            int fi = press(ans+"AB");
            if(fi == 0){
                int se = press(ans+"X")-i;
                if(se == 1) ans += "X";
                else ans += "Y";
            }
            else{
                int se = press(ans+"A")-i;
                if(se == 1) ans += "A";
                else ans += "B";
            }
            break;
        }
        int a = press(ans + c[0] + c[0] + ans + c[0] + c[1] + ans + c[1] + c[0])-i;
        if(a == 0){
            ans += c[2];
        }
        else if(a == 1){
            int b = press(ans + c[1] + c[1])-i;
            if(b == 0) ans += c[0] + c[2];
            else if(b == 1) ans += c[1] + c[2];
            else ans += c[1] + c[1];
            i++;
        }
        else{
            int b = press(ans + c[0] + c[0])-i;
            if(b == 0) ans += c[1] + c[0];
            else if(b == 1) ans += c[0] + c[1];
            else ans += c[0] + c[0];
            i++;
        }
        i++;
    }
    return ans;
}

Compilation message (stderr)

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