Submission #1167931

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167931		reitracn	Combo (IOI18_combo)	C++20	100 / 100	7 ms	484 KiB

combo

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

using namespace std;

std::string guess_sequence(int N) {
  string f;
  if (press("AB")) {
    if (press("A")) {
      f = "A";
    } else {
      f = "B";
    }
  } else {
    if (press("X")) {
      f = "X";
    } else {
      f = "Y";
    }
  }
  string g = "ABXY";
  g.erase(g.begin() + g.find(f));
  if (N >= 2) {
    for (int i = 0; i < N - 2; i++) {
      string cur = f + g[1] + f + g[0] + g[1] + f + g[0] + g[0] + f + g[0] + g[2];
      int x = press(cur);
      if (x == f.size() + 1) {
        f += g[1];
      } else if (x == f.size() + 2) {
        f += g[0];
      } else {
        f += g[2];
      }
    }
    string cur = f + g[0] + f + g[1];
    if (press(cur) > f.size()) {
      string last = f + g[0];
      if (press(last) > f.size()) {
        f += g[0];
      } else {
        f += g[1];
      }
    } else {
      f += g[2];
    }
  }
  return f;
}

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