Submission #1007159

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007159		christinelynn	Combo (IOI18_combo)	C++17	0 / 100	0 ms	344 KiB

combo

#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() {
  char x = 'O';
  for (int j = 0; j < 3; j++) {
    string r;
    r += S[j];
    if (press(r) == 1) x = S[j];
  }
  return (x == 'O' || S[3]);
}

// 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) {
  if (n == 0) return "";
  char patokan = getpatokan();
  set<char> st{'A', 'B', 'X', 'Y'};
  st.erase(patokan);
  string now;
  now += patokan;
  vector<char> a(all(st));
  // cout << a << endl;
  for (int i = 0; i < n-1; i++) {
    // cout << now << endl;
    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;
// }

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95