#include "combo.h"
#include <iostream>
using namespace std;
int n;
string u;
void placeChar0(string &p) {
if (press("AB")) p.push_back(press("A") ? 'A' : 'B');
else p.push_back(press("X") ? 'X' : 'Y');
}
void placeTillLast(string &p) {
for (int i = 2; i <= n - 1; i++) {
string s = p + u[2];
for (int i = 0; i < 3; i++) {
s += p + u[0] + u[i];
}
int x = press(s);
if (x == i) p.push_back(u[2]);
else if (x == i + 1) p.push_back(u[0]);
else p.push_back(u[1]);
}
}
void placeLast(string &p) {
if (press(p + u[0] + p + u[1]) == n - 1) p.push_back(u[2]);
else p.push_back(press(p + u[0]) == n ? u[0] : u[1]);
}
string guess_sequence(int N) {
n = N;
string p = "";
placeChar0(p);
// cerr << p << endl;
if (p[0] == 'A') {
u = "BXY";
} else if (p[0] == 'B') {
u = "AXY";
} else if (p[0] == 'X') {
u = "ABY";
} else {
u = "ABX";
}
placeTillLast(p);
// cerr << p << endl;
if (n > 1) placeLast(p);
// cerr << p << endl;
return p;
}
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