#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define repn(i, a, b) for(int i = (a); i < (b); i++)
#define rep(i, a) for(int i = 0; i < (a); i++)
#define all(v) v.begin(), v.end()
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define endl '\n'
string guess_sequence(int N){
string p = "";
if(press("AB")){
if(press("A")) p = "A";
else p = "B";
}
else{
if(press("X")) p = "X";
else p = "Y";
}
if(N == 1) return p;
string s = "";
for(char c : "ABXY"){
if(p[0] != c) s += c;
}
for(int i = 1; i < N - 1; i++){
int c = press(p + s[0] + s[0] + p + s[0] + s[1] + p + s[0] + s[2] + p + s[1]);
if(c == i + 2) p += s[0];
if(c == i + 1) p += s[1];
if(c == i) p += s[2];
}
if(press(p + s[0]) == N) p += s[0];
else if(press(p + s[1]) == N) p += s[1];
else p += s[2];
return p;
}
/*
Things to look out for:
- Integer overflows
- Array bounds
- Special cases
Be careful!
*/
