Submission #1093697

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093697		belgianbot	Combo (IOI18_combo)	C++17	100 / 100	23 ms	1096 KiB

combo

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

string guess_sequence(int N) {
  vector<char> poss;
  string p = "AB";
  int act = press(p);
  if (act) {
    p = "A";
    if (press(p)) {
      poss = {'B', 'X', 'Y'};
    }
    else {
      p = "B";
      poss = {'A', 'X', 'Y'};
    }
  }
  else {
    p = "X";
    if (press(p)) {
      poss = {'A', 'B', 'Y'};
    }
    else {
      p = "Y";
      poss = {'A', 'B', 'X'};
    }
  }
  
  for (int i = 1; i < N; i++) {
    string test = p;
    if (i != N - 1) {
      test += poss[0];
      test += p;
      test += poss[1]; test += poss[0];
      test += p;
      test += poss[1]; test += poss[1];
      test += p;
      test += poss[1]; test += poss[2];
      int coins = press(test);
      if (coins == i + 1) p += poss[0];
      else if (coins == i + 2) p += poss[1];
      else p += poss[2];
    }
    else {
      test += poss[0];
      int res = press(test);
      if (res == N) p += poss[0];
      else {
        test = p; test += poss[1];
        res = press(test);
        if (res == N) p += poss[1];
        else p += poss[2];
      }
    }
  }
  return p;
}

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