Submission #1200460

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200460		tamzid	Combo (IOI18_combo)	C++20	0 / 100	19 ms	408 KiB

combo

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

int best = 0;
string ans;
vector<char> ch{'A','B','X','Y'};

void backtrack(string &p,int &n)
{
    if(p.size() > 4 * n)
    {
      return;
    }
    int a = press(p);
    if(a > best)
    {
      best = a;
      ans = p;
    }
    if(best==n)
    {
        return;
    }
    for(int i=0;i<4;++i)
    {
      if(p[0] != ch[i])
      {
        p+=ch[i];
        backtrack(p,n);
        p.pop_back();
      }
    }
}

string guess_sequence(int N) {
  string p = "";
  vector<bool> vis(4,0);
  for(int i=0;i<4;++i)
  {
      p+=ch[i];
      backtrack(p,N);
      p.pop_back();
  }
  return ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95