This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#include "grader.cpp"
#include "combo.h"
#include <bits/stdc++.h>
#define sc second
#define fr first
#define mk make_pair
#define pb push_back
using namespace std;
const int NN = (1e6 + 5);
const int inf = (1e9 + 7);
string a,s,t;
int f;
string guess_sequence(int n) {
if (press("A") > 0) f = 1,a += "A";
else if (press("B") > 0) f = 2,a += "B";
else if (press("X") > 0) f = 3,a += "X";
else f = 4,a += "Y";
if (f != 1) s += "A";
if (f != 2) s += "B";
if (f != 3) s += "X";
if (f != 4) s += "Y";
for (int i = 2; i < n; i ++) {
t = "";
t += a + s[0];
t += a + s[1] + s[0];
t += a + s[1] + s[1];
t += a + s[1] + s[2];
int coin = press(t);
if (coin == i) a += s[0];
else if (coin == i + 1) a += s[1];
else a += s[2];
}
if (n == 1) {
return a;
}
if (press(a + s[0]) == n) a += s[0];
else if (press(a + s[1]) == n) a += s[1];
else a += s[2];
return a;
}
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