#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
string guess_sequence(int n) {
srand(time(0));
string ans="";
vector<char> c, cc = {'A', 'B', 'X', 'Y'};
bool found = 0;
for(int i = 0; i < 3; ++i){
if(press(ans+cc[i])){
ans.pb(cc[i]);
for(char cch : cc)
if(cch != cc[i]) c.pb(cch);
found = 1;
break;
}
}
if(!found){
ans.pb(cc[3]);
for(char cch : cc)
if(cch != cc[3]) c.pb(cch);
}
for(int i = 1; i < n; ++i){
random_shuffle(c.begin(), c.end());
if(i == n-1){
int ret = press(ans+c[0]);
if(ret == i+1){
ans.pb(c[0]);
}else{
ret = press(ans+c[1]);
if(ret == i+1){
ans.pb(c[1]);
}else ans.pb(c[2]);
}
break;
}
string ask1={c[0],c[0]}, ask2 = {c[0], c[1]};
int ret = press(ans+ask1+ans+ask2);
if(ret == i+2){
ret = press(ans+ask1);
if(ret == i+2) ans += ask1;
else ans += ask2;
++i;
}else if(ret == i+1){
ans.pb(c[0]);
ans.pb(c[2]);
++i;
}else{
ask1 = {c[1], c[0]}, ask2 = {c[1], c[1]};
ret = press(ans+ask1+ans+ask2);
if(ret == i+2){
ret = press(ans+ask1);
if(ret == i+2) ans += ask1;
else ans += ask2;
++i;
}else if(ret == i+1){
ans.pb(c[1]);
ans.pb(c[2]);
++i;
}else{
ans.pb(c[2]);
}
}
}
return ans;
}
