Submission #313284

#	Time	Username	Problem	Language	Result	Execution time	Memory
313284		lani1akea	Combo (IOI18_combo)	C++17	100 / 100	50 ms	660 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;
string guess_sequence(int N) {
  vector<char> ch = {'A', 'B', 'X', 'Y'};
  int x = 0;
  string s;
  if (press("AB") >= 1) x = press("A") != 1;
  else x = 2 + (press("X") < 1);
  s += ch[x];
  ch.erase(ch.begin() + x);
  if (N == 1) return s;
  for (int i = 1; i < N - 1; ++i) {
    x = press(s + ch[0] + ch[0] + s + ch[0] + ch[1] + s + ch[0] + ch[2] + s + ch[1]);
    if (x == i + 2) s += ch[0];
    else if (x == i + 1) s += ch[1];
    else s += ch[2];
  }

  if (press(s + ch[0] + s + ch[1]) == N) {
    if (press(s + ch[0]) == N) s += ch[0];
    else s += ch[1];
  } else {
    s += ch[2];
  }
  return s;
}

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