/*
_ __ __ __ ____ ___ _ __
| | /| / / ___ _ / /_ ____ / / / __ \ ___ ___ / _ \ (_) ___ ____ ___ / /
| |/ |/ / / _ `// __// __/ / _ \ / /_/ / / _ \/ -_) / ___/ / / / -_)/ __// -_) /_/
|__/|__/ \_,_/ \__/ \__/ /_//_/ \____/ /_//_/\__/ /_/ /_/ \__/ \__/ \__/ (_)
*/
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
// #pragma GCC target("avx2")
#include <bits/stdc++.h>
#include "combo.h"
#define ll long long
#define ull unsigned ll
#define ld long double
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define rsz resize
#define fi first
#define se second
#define LMAX LLONG_MAX
#define LMIN LLONG_MIN
#define IMAX INT_MAX
#define IMIN INT_MIN
// #define endl "\n"
#define newline cout << endl;
using namespace std;
// constants
// functions
// structs
// globals
// notes
/*
My favorite anime is One Piece(obviously)
My oshi(Yes, I have an oshi, deal with it) is Kamil_Tsubaki
-stuff you should look for-
* int overflow, array bounds
* special cases (n=1?)
* do something instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
continue - skip the rest in the loop
*/
string guess_sequence(int N)
{
int n = N;
auto ask = [&](string s)
{
int k = press(s);
return k;
};
string res;
if (ask("AB"))
{
if (ask("A"))
{
res = "A";
}
else
{
res = "B";
}
}
else
{
if (ask("X"))
{
res = "X";
}
else
{
res = "Y";
}
}
if (n == 1)
{
return res;
}
vector <char> cs = {'A', 'B', 'X', 'Y'};
cs.erase(find(all(cs), res[0]));
for (int i = 1; i < n - 1; i++)
{
string tmp = res + cs[0];
for (int j = 0; j < 3; j++)
{
tmp += res + cs[1] + cs[j];
}
int k = ask(tmp);
if ((int)res.size() == k - 1)
{
res += cs[0];
}
else if ((int)res.size() == k - 2)
{
res += cs[1];
}
else
{
res += cs[2];
}
}
for (int i = 0; i < 2; i++)
{
if (ask(res + cs[i]) == n)
{
res += cs[i];
break;
}
}
if ((int)res.size() != n)
{
res += cs[2];
}
return res;
}
/*
$$$$$$$$\ $$$$$$$$\
$$ _____|\____$$ |
$$ | $$ /
$$$$$\ $$ /
$$ __| $$ /
$$ | $$ /
$$$$$$$$\ $$$$$$$$\
\________|\________|
*/
