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>
using namespace std;
#define sz(x) (int)x.size()
// string S;
// int N;
// int calls = 0;
// int press(string p)
// {
// calls++;
// // cout << "pressing " << p << '\n';
// if ((int)p.length() > N * 4)
// return -1;
// int ret = 0;
// int counter = 0;
// int i = 0;
// int j = 0;
// while (i < (int)p.size())
// {
// // cout << "i = " << i << '\n';
// while (i < (int)p.size() && j < (int)S.size() && p.at(i) == S.at(j))
// {
// i++, j++, counter++;
// }
// ret = max(ret, counter);
// j = 0, i++;
// counter = 0;
// }
// return ret;
// }
string guess_sequence(int N)
{
string s = "";
vector<char> ch = {'A', 'B', 'X', 'Y'};
if (press("AB"))
s += (press("A") ? "A" : "B");
else
s += (press("X") ? "X" : "Y");
ch.erase(find(ch.begin(), ch.end(), s[0]));
for (int i = 1; i < N - 1; i++)
{
string combo = s + ch[0] + s + ch[1] + ch[0] + s + ch[1] + ch[1] + s + ch[1] + ch[2];
int curr_sz = sz(s);
int qry = press(combo);
// int qry = press(s + ch[0] + s + ch[1] + ch[1]);
if (curr_sz + 2 == qry)
s += ch[1];
else if (curr_sz + 1 == qry)
s += ch[0];
else
s += ch[2];
}
if (press(s + "A" + s + "B") > sz(s))
s += (press(s + "A") > sz(s) ? "A" : "B");
else
s += (press(s + "X") > sz(s) ? "X" : "Y");
return s;
}
// int main()
// {
// S = "ABYXBYXBB";
// N = S.length();
// cout << guess_sequence(N) << '\n';
// cerr << "Function Calls = " << calls << '\n';
// return 0;
// }
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