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 <bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int n) {
string ans;
set<string> s = {"A", "B", "X", "Y"};
string cope = ans + 'A' + ans + 'B';
int d = press(cope);
if (d >= 1) {
cope = ans + 'A';
d = press(cope);
if (d >= 1) {
ans += 'A';
s.erase("A");
} else {
ans += 'B';
s.erase("B");
}
} else {
cope = ans + 'X';
d = press(cope);
if (d >= 1) {
ans += 'X';
s.erase("X");
} else {
ans += 'Y';
s.erase("Y");
}
}
vector<string> cand;
for (auto &x : s) {
cand.emplace_back(x);
}
for (int i = 2; i <= n; i++) {
if (i == n) {
string cope = ans + cand[0] + ans + cand[1];
int d = press(cope);
if (d >= i) {
cope = ans + cand[0];
d = press(cope);
if (d >= i) {
ans += cand[0];
} else {
ans += cand[1];
}
} else {
ans += cand[2];
}
} else {
string cope = ans + cand[0] + cand[0] + ans + cand[0] + cand[1] + ans + cand[0] + cand[2] + ans + cand[1];
int d = press(cope);
if (d >= i + 1) {
ans += cand[0];
} else if (d >= i) {
ans += cand[1];
} else {
ans += cand[2];
}
}
}
return ans;
}
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