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 "combo.h"
#include <bits/stdc++.h>
#define el '\n'
#define fi first
#define sc second
//#define int long long
using namespace std;
using ll=long long;
using ull=unsigned long long;
using ld=long double;
const int mod=1e9+7;
//const int N=1e5+11;
//namespace {
//
//constexpr int MAX_N = 2000;
//constexpr int MAX_NUM_MOVES = 8000;
//
//int N;
//std::string S;
//
//int num_moves;
//
//void wrong_answer(const char *MSG) {
// printf("Wrong Answer: %s\n", MSG);
// exit(0);
//}
//
//} // namespace
//
//int press(std::string p) {
// if (++num_moves > MAX_NUM_MOVES) {
// wrong_answer("too many moves");
// }
// int len = p.length();
// if (len > 4 * N) {
// wrong_answer("invalid press");
// }
// for (int i = 0; i < len; ++i) {
// if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
// wrong_answer("invalid press");
// }
// }
// int coins = 0;
// for (int i = 0, j = 0; i < len; ++i) {
// if (j < N && S[j] == p[i]) {
// ++j;
// } else if (S[0] == p[i]) {
// j = 1;
// } else {
// j = 0;
// }
// coins = std::max(coins, j);
// }
// return coins;
//}
string guess_sequence(int n)
{
string s="ABXY", ans="";
int ch, pos;
ch=press("AB");
if(ch)
{
int v=press("A");
if(v) pos=0;
else pos=1;
}
else
{
int v=press("X");
if(v) pos=2;
else pos=3;
}
ans+=s[pos];
if(n==1) return ans;
swap(s[pos], s[3]);
for(int i=1;i<n-1;i++)
{
string tmp=ans+s[0]+s[0]+ans+s[0]+s[1]+ans+s[0]+s[2]+ans+s[1];
// cout << tmp << el;
int l=press(tmp);
// cout << l << el;
if(l==i+2) ans+=s[0];
else if(l==i+1) ans+=s[1];
else ans+=s[2];
}
// cout << ans << el;
if(press(ans+s[0])==n) return ans+s[0];
else if(press(ans+s[1])==n) return ans+s[1];
else return ans+s[2];
}
//int main() {
// cin >> S;
// N = S.length();
//
// num_moves = 0;
// std::string answer = guess_sequence(N);
// if (answer != S) {
// wrong_answer("wrong guess");
// exit(0);
// }
// printf("Accepted: %d\n", num_moves);
// return 0;
//}
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