# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1007138 | christinelynn | Combo (IOI18_combo) | C++17 | 0 ms | 0 KiB |
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 all(x) x.begin(), x.end()
int press(string hm) {
cout << hm << endl;
int ans;cin>>ans;
return ans;
}
string S = "ABXY";
char getpatokan() {
int res1 = press("AB"), res2 = press("BX");
if (res1 && res2) return 'B';
else if (res1) return 'A';
else if (res2) return 'X';
else return 'Y';
}
// ABXYBYYXB
// patokan: A
// BXYBYYXB
// guess 2 chars by 2 queries
// XX, BX, BY, YB -> 2
// XB, BB, XY, YX -> 1
// XXX
// AYY
string guess_sequence(int n) {
char patokan = getpatokan();
set<char> st{'A', 'B', 'X', 'Y'};
st.erase(patokan);
string now;
now += patokan;
vector<char> a(all(st));
for (int i = 0; i < n-1; i++) {
string s;
for (int j = 0; j < 3; j++) s += now + a[0] + a[j];
s += now + a[1];
int x = press(s);
if (x-now.size() == 0) now += a[2];
else if (x - now.size() == 1) now += a[1];
else now += a[0];
}
return now;
}
int main() {
int n;cin>>n;
cout << guess_sequence(n) << endl;
}