Submission #413726

#	Time	Username	Problem	Language	Result	Execution time	Memory
413726		pliam	Combo (IOI18_combo)	C++14	100 / 100	43 ms	524 KiB

combo

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

string K;
string a,b,c;

std::string guess_sequence(int N) {
  //find first letter
  if(press("AB")){
    if(press("B")){
      K="B";
      a="A";
      b="X";
      c="Y";
    }else{
      K="A";
      a="B";
      b="X";
      c="Y";
    }
  }else if(press("X")){
    K="X";
    a="A";
    b="B";
    c="Y";
  }else{
    K="Y";
    a="A";
    b="B";
    c="X";
  }
  int pos=1;
  while(pos<N-1){
    int ans1,ans2;
    ans1=press(K+a+a+K+b+a+K+a+b)-K.size();
    if(ans1==2){
      ans2=press(K+a+a)-K.size();
      if(ans2==0){
        K+=(b+a);
        pos+=2;
        continue;
      }else if(ans2==1){
        K+=(a+b);
        pos+=2;
        continue;
      }else{
        K+=(a+a);
        pos+=2;
        continue;
      }
    }else if(ans1==1){
      ans2=press(K+b+b)-K.size();
      if(ans2==0){
        K+=(a+c);
        pos+=2;
        continue;
      }else if(ans2==1){
        K+=(b+c);
        pos+=2;
        continue;
      }else{
        K+=(b+b);
        pos+=2;
        continue;
      }
    }else{
      K+=c;
      pos++;
      continue;
    }
  }
  if(pos==N-1){
    if(press(K+a)-K.size()){
      K+=a;
    }else if(press(K+b)-K.size()){
      K+=b;
    }else{
      K+=c;
    }
  }
  return K;
}

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