Submission #1007168

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007168		makanhulia	Combo (IOI18_combo)	C++17	5 / 100	1 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];
      break;
    }
  }
  return (x == 'O' ? S[3] : x);
}

// 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-2; 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];
  }
  
  for (auto c : a) {
    if (press(now + c) == now.size()+1) {
      return now+c;
    }
  }

  // return now;
}

// int main() {
//   int n;cin>>n;
//   cout << guess_sequence(n) << endl;
// }

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:62:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |     if (press(now + c) == now.size()+1) {
      |         ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:44:34: warning: control reaches end of non-void function [-Wreturn-type]
   44 |   set<char> st{'A', 'B', 'X', 'Y'};
      |                                  ^

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