Submission #1017080

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017080		eldorbek_008	Combo (IOI18_combo)	C++17	5 / 100	1 ms	360 KiB

combo

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

using namespace std;

#define len(x) (int)(x).size()

std::string guess_sequence(int N) {
  string a;
  int x = press("AB");
  if (x > 0) {
    x = press("B");
    if (x > 0) {
      a = "B";
    } else {
      a = "A";
    }
  } else {
    x = press("Y");
    if (x > 0) {
      a = "Y";
    } else {
      a = "X";
    }
  }
  string r = "ABXY";
  r.erase(r.begin() + r.find(a[0]));
  // cout << r << endl;
  for (int i = 0; i < N - 2; i++) {
    string cur = a + r[1] + a + r[0] + r[1] + a + r[0] + r[0] + a + r[0] + r[2];
    int y = press(cur);
    if (y == len(a) + 1) {
      a += r[1]; // only a + r[1] can make len(a) + 1
    } else if (y == len(a) + 2) {
      a += r[0]; // next char must be r[0]
    } else {
      a += r[2]; // last choice
    }
  }
  string last = a + r[0] + a + r[1];
  x = press(last);
  if (x == len(a) + 1) {
    last = a + r[0];
    x = press(last);
    if (x == len(a)) {
      a += r[1];
    } else {
      a += r[0];
    }
  } else {
    a += r[2];
  }
  return a;
}

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