Submission #1279768

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279768		tull	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
  int p=0,r;
  char c[]={'A','B','X','Y'};
  char sk,nt;
  string a="";
  for(int i=0;i<4;++i){
    char e=c[i];
    nt=c[(i==3?0:i+1)];
    r=press(a+e+nt);
      if(r>p){
        a+=e;
        if(r-p==2){
          a+=nt;
          ++p;
          nt='-';
        }
        ++p;
        sk=e;
        break;
    }
  }
  while (p<N)
  {
    for(int i=0;i<4;++i){
      char e=c[i];
      if(e==sk or e==nt)continue;
      if(i!=3 and N-p>1)r=press(a+e+e);
      else if(i!=3 and N-p==1)r=press(a+e);
      else r=p+1;
      char nt=c[(i==3?0:i+1)];
      if(r>p){
        a+=e;
        if(r-p==2){
          a+=nt;
          ++p;
          nt='-';
        }
        ++p;
        break;
      }
    }
  }
  
  return a;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:11:7: error: 'press' was not declared in this scope
   11 |     r=press(a+e+nt);
      |       ^~~~~
combo.cpp:29:27: error: 'press' was not declared in this scope
   29 |       if(i!=3 and N-p>1)r=press(a+e+e);
      |                           ^~~~~
combo.cpp:30:33: error: 'press' was not declared in this scope
   30 |       else if(i!=3 and N-p==1)r=press(a+e);
      |                                 ^~~~~