Submission #1029312

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029312		Osplei	Combo (IOI18_combo)	C++17	100 / 100	22 ms	1884 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
 
using namespace std;
 
typedef pair<int,int> ii;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii; 
typedef vector<vii> wgraf;
typedef pair<int,ii> edge;
typedef vector <ll> vl;
typedef pair <ll, ll> LL;
typedef vector <LL> vll;
 
#define UNVISITED 0
#define VISITED 1
#define pb push_back
#define F first
#define S second

string guess_sequence(int N){
  ll k = 0, aux;
  string ans = "", act;

  act = "XA";

  aux = press(act);

  if (aux != 0) {
    act = "X";
    aux = press(act);
    if (aux != 0) ans += 'X';
    else ans += 'A';
  } else {
    act = "B";
    aux = press(act);
    if (aux != 0) ans += 'B';
    else ans += 'Y';
  }

  if (N == 1) return ans;

  k = 1;

  for (ll i = 1; i < N - 1; i++) {
    act = ans;
    if (ans[0] == 'X') {

      act += 'A';
      act += 'A';
      act += ans;
      act += 'A';
      act += 'B';
      act += ans;
      act += 'A';
      act += 'Y';

      act += ans;
      act += 'B';
      aux = press(act);

      if (aux == k + 2) ans += 'A';
      else if (aux == k + 1) ans += 'B';
      else ans += 'Y';

    } else if (ans[0] == 'A') {

      act += 'X';
      act += 'X';
      act += ans;
      act += 'X';
      act += 'B';
      act += ans;
      act += 'X';
      act += 'Y';

      act += ans;
      act += 'B';
      aux = press(act);

      if (aux == k + 2) ans += 'X';
      else if (aux == k + 1) ans += 'B';
      else ans += 'Y';

    } else if (ans[0] == 'B') {

      act += 'A';
      act += 'A';
      act += ans;
      act += 'A';
      act += 'X';
      act += ans;
      act += 'A';
      act += 'Y';

      act += ans;
      act += 'X';
      aux = press(act);

      if (aux == k + 2) ans += 'A';
      else if (aux == k + 1) ans += 'X';
      else ans += 'Y';

    } else {

      act += 'A';
      act += 'A';
      act += ans;
      act += 'A';
      act += 'B';
      act += ans;
      act += 'A';
      act += 'X';

      act += ans;
      act += 'B';
      aux = press(act);

      if (aux == k + 2) ans += 'A';
      else if (aux == k + 1) ans += 'B';
      else ans += 'X';

    }

    k++;
  }

  if (ans[0] == 'X'){
    act = ans;
    act += 'A';
    act += ans;
    act += 'B';
    aux = press(act);
    
    if (aux >= N) {
      act = ans;
      act += 'A';

      aux = press(act);

      if (aux == N) {
        ans += 'A';
        return ans;
      } else {
        ans += 'B';
        return ans;
      }
    } else {
      ans += 'Y';
      return ans;
    }
  } else if (ans[0] == 'A'){
    act = ans;
    act += 'X';
    act += ans;
    act += 'B';
    aux = press(act);
    
    if (aux >= N) {
      act = ans;
      act += 'X';

      aux = press(act);

      if (aux == N) {
        ans += 'X';
        return ans;
      } else {
        ans += 'B';
        return ans;
      }
    } else {
      ans += 'Y';
      return ans;
    }
  } else if (ans[0] == 'B'){
    act = ans;
    act += 'A';
    act += ans;
    act += 'X';
    aux = press(act);
    
    if (aux >= N) {
      act = ans;
      act += 'A';

      aux = press(act);

      if (aux == N) {
        ans += 'A';
        return ans;
      } else {
        ans += 'X';
        return ans;
      }
    } else {
      ans += 'Y';
      return ans;
    }

  } else {

    act = ans;
    act += 'A';
    act += ans;
    act += 'B';
    aux = press(act);
    
    if (aux >= N) {
      act = ans;
      act += 'A';

      aux = press(act);

      if (aux == N) {
        ans += 'A';
        return ans;
      } else {
        ans += 'B';
        return ans;
      }
    } else {
      ans += 'X';
      return ans;
    }
  }

}

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