Submission #401577

#	Time	Username	Problem	Language	Result	Execution time	Memory
401577		_DaNeK_	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>

using namespace std;

vector < char > m = {'A', 'B', 'Y', 'X'};

int press(string p)

string guess_sequence(int N)
{
    string res = "";
    int tmp = press("AB");
    if (tmp > 1)
    {
        if (press("A"))
        {
            res = "A";
            m.erase(m.begin());
        }
        else
        {
            res = "B";
            m.erase(m.begin() + 1);
        }
    }
    else
    {
        if (press("X"))
        {
            res = "X";
            m.erase(m.begin() + 3);
        }
        else
        {
            res = "Y";
            m.erase(m.begin() + 2);
        }
    }
    if (N == 1)
        return res;
    int cur = 2;
    while (res.size() < N - 1)
    {
        string s = res + m[0] + res + m[1] + m[0] + res + m[1] + m[1] + res + m[1] + m[2];
        int tmp = press(s);
        if (tmp == cur - 1)
            res += m[2];
        else
        {
            if (tmp == cur)
                res += m[0];
            else
                res += m[1];
        }
        ++cur;
    }
    if (press(res + m[0]) == cur)
        res += m[0];
    else if (press(res + m[1]) == cur)
        res += m[1];
    else
        res += m[2];
    return res;
}

Compilation message (stderr)

combo.cpp:9:1: error: expected initializer before 'string'
    9 | string guess_sequence(int N)
      | ^~~~~~