Submission #314132

#	Time	Username	Problem	Language	Result	Execution time	Memory
314132		lauran	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int n) {
    string ret;

    // 1. aflu primul caracter
    int ans = press("AB");
    if (ans == 0) {
        ans = press("Y");
        if (ans == 1)
            ret += "Y";
        else
            ret += "X";
    }
    else if (ans == 1) {
        ans = press("A");
        if (ans == 1)
            ret += "A";
        else
            ret += "B";
    }
    else
        ret += "A";

    vector <string> rest;
    if (ret[0] != 'A') rest.push_back("A");
    if (ret[0] != 'B') rest.push_back("B");
    if (ret[0] != 'X') rest.push_back("X");
    if (ret[0] != 'Y') rest.push_back("Y");

    for (int i = 2; i <= n - 1; i++) {
        ans = press((ret + rest[0]) + (ret + rest[1] + rest[0]) + ret + (rest[1] + rest[1]) + ret + (rest[1] + rest[2]));
        if (ans == ret.size() + 1)
            ret += rest[0];
        else if (ans == ret.size() + 2)
            ret += rest[1];
        else if (ans == ret.size())
            ret += rest[2];
    }

    if (n > 1) for (int i = 0; i <= 1; i++) {
        ans = press(ret + rest[i]);
        if (ans == ret.size() + 1)
            return ret + rest[i];
    }
    if (n > 1) return ret + rest[2];
    return ret;
}

Compilation message (stderr)

combo.cpp:2:1: error: 'string' does not name a type
    2 | string guess_sequence(int n) {
      | ^~~~~~