#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
#define pb push_back
typedef pair<int,int> pii;
#define fi first
#define se second
#define debug(x) cerr<<#x<<" is "<<x<<endl;
string bsta(string o){
int x=o.length();
int q=press(o+"A"+o+"B");
if(q>x){
q=press(o+"A");
if(q>x)return "A";
else return "B";
}else{
q=press(o+"X");
if(q>x)return "X";
else return "Y";
}
}
std::string guess_sequence(int N) {
string s="";
s=bsta(s);
vector<string> g,a;
if(s=="A")g={"BB","BX","BY","X"},a={"Y","X","B"};
else if(s=="B")g={"AA","AX","AY","X"},a={"Y","X","A"};
else if(s=="X")g={"AA","AB","AY","B"},a={"Y","B","A"};
else if(s=="Y")g={"AA","AB","AX","B"},a={"X","B","A"};
for(int i=1;i<N-1;i++){
int q=press(s+g[0]+s+g[1]+s+g[2]+s+g[3]);
q-=i;
s+=a[q];
}
s+=bsta(s);
return s;
}
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