Submission #583887

#	Time	Username	Problem	Language	Result	Execution time	Memory
583887		LIF	Combo (IOI18_combo)	C++14	10 / 100	75 ms	624 KiB

combo

#include "combo.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;
	}
  	 
  }
  if(first == 999 )//that means first haven't been changed
  {
  	first = 3;
  }
  p = p + k[first];
  for(int i=1;i<n;i++)
  {
  	int flag = 0;
  	for(int j=0;j<3;j++)
  	{
  		if(j == first)continue;
  		std::string ss = p;
  		ss = ss + k[j];
  		if(press(ss) == i+1)
  		{
  			flag = 1;
  			p = p + k[j];
  			break;
		}
	}
	if(flag == 0)
	{
		p = p + k[3];
	}
  }
  return p;
}

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