Submission #584220

#	Time	Username	Problem	Language	Result	Execution time	Memory
584220		LIF	Combo (IOI18_combo)	C++14	97 / 100	36 ms	744 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
std::string guess_sequence(int N) {
  std::string p = "";
  int n = N;
  char k[4] = {'A','B','X','Y'};
  int first=999;
  /*for(int i=0;i<3;i++)
  {
  	 std:: string ss = p;
  	 ss = ss + k[i];
  	 int kk = press(ss);
  	if(kk == 1)
	{
		first = i;
		break;
	}
  	 
  }*/
  int check1=0,check2=0;
  std::string ss= p;
  ss = ss + k[0];
  ss = ss + k[1];
  if(press(ss) >=1) //that means the first place can be A or B
  {
  	ss = p;
  	ss = ss + k[0];
	if(press(ss) ==1)
  	{
  	  p = p +k[0];
  	  first = 0;
	}
	else
	{
	  p = p + k[1];
	  first = 1;
	}
  } 
  else //that means the first plavc
  {
  	 ss = p;
  	 ss = ss + k[2];
  	 if(press(ss) == 1)
  	 {
  	 	p = p +k[2];
  	 	first =2;
	   }
	   else
	   {
	   	p = p +k[3];
	   	first = 3;
	   }
  }
  int all=0;
	if(first == 3)
	{
		all = 2;
	}
	else
	{
		all = 3;
	}
	for (int i = 1; i < n-1;i++)
  	{
  		std::string tt = p;
  		std::string ss="";
		int kk = 0;
  		for(int j = 0;j < all; j++)
  		{
  			tt = p;	
  			if(j == first)continue;
  			if(kk == 0)
  			{
  				check1 = j;
  				tt += k[j];
  				ss += tt;
			}
			else
			{
				check2 = j;
				tt += k[j];
				std::string xxx= tt;
				for(int pk=0;pk<4;pk++)
				{	
					if(pk==first)continue;
					tt = xxx + k[pk];
					ss+= tt;	
					
				}	
			}
			kk++;
		
		}
		int ans= press(ss);
		if(ans == i+1)
		{
			p = p + k[check1];
		}
		else
		{
			if(ans == i+2)
			{
				p = p+k[check2];
			}
			else
			{
				for(int j=0;j<4;j++)
				{
					if(j!=check1&&j!=check2&&j!=first)
					{
						p = p + k[j];
					}
				}
			}
		}
	}
	int flag=0;
	if(n!=1)
	{
		for(int j=0;j<3;j++)
		{
			std::string ss = p;
			if(j == first )continue;
			ss += k[j];
			if(press(ss) == n)
			{
				flag=1;
				p = p+k[j];
				break;
			}
		}
	}

	if(flag==0&&n!=1)
	{
		p = p + k[3];
	}
  return p;
}

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