#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <queue>
#include <random>
#include "combo.h"
using namespace std;
#define all(a) (a).begin(), (a).end()
#define ll long long
#define ld long double
#define ui uint64_t
#define cont(set, element) ((set).find(element) != (set).end())
#define pb push_back
#define chmin(x, y) (x = min(x, y))
#define chmax(x, y) (x = max(x, y))
/********* DEBUG *********/
template <typename T>
void outvec(const vector<T>& Z){
for (const T& x : Z)
cout << x << ' ';
cout << "\n";
}
void printVariable(const any& var) {
if (!var.has_value()) {
cout << "null";
return;
}
if (var.type() == typeid(int)) {
cout << any_cast<int>(var);
} else if (var.type() == typeid(double)) {
cout << any_cast<double>(var);
} else if (var.type() == typeid(float)) {
cout << any_cast<float>(var);
} else if (var.type() == typeid(char)) {
cout << any_cast<char>(var);
} else if (var.type() == typeid(bool)) {
cout << (any_cast<bool>(var) ? "true" : "false");
} else if (var.type() == typeid(string)) {
cout << any_cast<string>(var);
} else if (var.type() == typeid(const char*)) {
cout << any_cast<const char*>(var);
} else if (var.type() == typeid(long long)) {
cout << any_cast<long long>(var);
} else {
cout << "[unknown type]";
}
}
template<typename... Args>
void outval(Args... args) {
vector<any> variables = {args...};
for (size_t i = 0; i < variables.size(); ++i) {
printVariable(variables[i]);
if (i != variables.size() - 1) {
cout << " ";
}
}
cout << "\n";
}
#define sp << " " <<
#define fi first
#define se second
/********* DEBUG *********/
const ll MOD2 = 1e9 + 7;
const ll MOD = 998244353;
const ll inf = 1e18;
string guess_sequence(int N) {
string ans = "";
if (press("AB")){
if (press("A"))
ans = "A";
else
ans = "B";
}
else{
if (press("X"))
ans = "X";
else
ans = "Y";
}
if (N == 1)
return ans;
vector<char> ord(3);
ll i = 0;
if (ans[0] != 'A')
ord[i++] = 'A';
if (ans[0] != 'B')
ord[i++] = 'B';
if (ans[0] != 'X')
ord[i++] = 'X';
if (ans[0] != 'Y')
ord[i++] = 'Y';
for (int i = 0; i < N-2; i++){
// N
string in = ans;
in += ord[1];
// 2N
in += ans;
in += ord[2];
in += ord[0];
// 3N
in += ans;
in += ord[2];
in += ord[1];
// 4N
in += ans;
in += ord[2];
in += ord[2];
ll val = press(in);
if (val == i+1)
ans += ord[0];
else if (val == i+2)
ans += ord[1];
else
ans += ord[2];
}
ans += ord[0];
if (press(ans) == N)
return ans;
ans.pop_back();
ans += ord[1];
if (press(ans) == N)
return ans;
ans.pop_back();
ans += ord[2];
return ans;
}
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