Submission #379857

#	Time	Username	Problem	Language	Result	Execution time	Memory
379857		SuhaibSawalha1	Combo (IOI18_combo)	C++14	97 / 100	47 ms	568 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

vector<char> ca {'A', 'B', 'X', 'Y'}, cand;

string guess_sequence (int n) {
  string ans;
  for (int i = 0; i < 4; ++i) {
    ans = ca[i];
    if (i == 3 || press(ans)) {
      ca.erase(ca.begin() + i);
      cand = ca;
      break;
    }
  }
  for (int i = 1; i < n - 1; ++i) {
    string ask = ans + ca[0] + ans + ca[1] + ca[0] + ans + ca[1] + ca[1] + ans + ca[1] + ca[2];
    int x = press(ask);
    if (x == i) {
      ans += ca[2];
    }
    else if (x == i + 1) {
      ans += ca[0];
    }
    else {
      ans += ca[1];
    }
  }
  return n == 1 ? ans : ans + (press(ans + ca[0]) == n ? ca[0] : press(ans + ca[1]) == n ? ca[1] : ca[2]);
}

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