Submission #118930

#	Time	Username	Problem	Language	Result	Execution time	Memory
118930		Autoratch	Combo (IOI18_combo)	C++14	100 / 100	54 ms	596 KiB

combo

#include <bits/stdc++.h>
 #include "combo.h"
   using namespace std;
   
   string guess_sequence(int n)
   {
       string all = "ABXY",pos,ans;
       if(press("AB"))
       {
           if(press("A")) ans = "A";
           else ans = "B";
       }
       else
       {
           if(press("X")) ans = "X";
           else ans = "Y";
       }
       if(n==1) return ans;
       for(int i = 0;i < 4;i++) if(all[i]!=ans[0]) pos = pos+all[i];
       for(int i = 1;i < n-1;i++)
       {
           string tmp = ans+pos[0];
           for(int j = 0;j < 3;j++) tmp+=ans+pos[1]+pos[j];
           int ret = press(tmp);
           if(ret==i) ans+=pos[2];
           else if(ret==i+1) ans+=pos[0];
           else ans+=pos[1];
       }
       if(press(ans+pos[0]+ans+pos[1])==n) 
       {
           if(press(ans+pos[0])==n) ans+=pos[0];
           else ans+=pos[1];
       }
       else ans+=pos[2];
       return ans;
   }

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