Submission #335434

#	Time	Username	Problem	Language	Result	Execution time	Memory
335434		madlogic	Combo (IOI18_combo)	C++17	97 / 100	48 ms	524 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
  string str = "ABXY", ans;
  for (int i = 0; i < 3; i++) {
    string s;
    s += str[i];
    if (press(s)) {
      ans += str[i];
      break;
    }
  }
  if (ans.empty()) {
    ans += str[3];
  }
  string nstr;
  for (char& c : str) {
    if (c != ans[0]) {
      nstr += c;
    }
  }
  str = nstr;
  for (int i = 1; i < N; i++) {
    if (i == N - 1) {
      bool found = false;
      for (int j = 0; j < 2; j++) {
        string s = ans + str[j];
        if (press(s) == N) {
          ans += str[j];
          found = true;
          break;
        }
      }
      if (!found) {
        ans += str[2];
      }
    } else {
      string checker = ans + nstr[0] + ans + nstr[1] + nstr[0] + ans + nstr[1] +
                       nstr[1] + ans + nstr[1] + nstr[2];
      int res = press(checker);
      if (res == i) {
        ans += nstr[2];
      } else if (res == i + 1) {
        ans += nstr[0];
      } else {
        ans += nstr[1];
      }
    }
  }
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95