Submission #140731

#	Time	Username	Problem	Language	Result	Execution time	Memory
140731		astoria	Combo (IOI18_combo)	C++14	100 / 100	63 ms	556 KiB

combo

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

string guess_sequence(int N){
  if (N==1){
  	if (press("X")==1) return "X";
  	if (press("Y")==1) return "Y";
  	if (press("A")==1) return "A";
  	return "B";
  }
  string solved_string;
  int xy = press("XY");
  if (xy>=1){
    if (press("X") == 1){
      solved_string = "X";
    }
    else solved_string = "Y";
  }
  else{
    if (press("A") == 1){
      solved_string = "A";
    }
    else solved_string = "B";
  }
  string valids[3];
  if (solved_string=="A"){ valids[0] = "B"; valids[1] = "X"; valids[2] = "Y";}
  if (solved_string=="B"){ valids[0] = "A"; valids[1] = "X"; valids[2] = "Y";}
  if (solved_string=="X"){ valids[0] = "A"; valids[1] = "B"; valids[2] = "Y";}
  if (solved_string=="Y"){ valids[0] = "A"; valids[1] = "B"; valids[2] = "X";}
  
  //cout << solved_string << endl;
  
  for (int i=1; i<N-1; i++){
  	string newnew =  solved_string + valids[0] + solved_string + valids[1] + valids[0] + solved_string + valids[1] + valids[1] + solved_string + valids[1] + valids[2];
    int p = press(newnew);
    if (p==i+2) solved_string+=valids[1];
    else if (p==i+1) solved_string+=valids[0];
    else solved_string+=valids[2];
  }
  string hi = solved_string+valids[0]; string ih = solved_string+valids[1];
  string ihhi = solved_string+valids[2];
  if (press(hi) == N) return hi;
  if (press(ih) == N) return ih;
  else return ihhi;
  //return "Hi";
}

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