Submission #1281125

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281125		Faisal_Saqib	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
using namespace std;
std::string guess_sequence(int n) {
  string s="";
  if(press("AB"))
  {
    if(press("A"))
    {
        s+='A';
    }
    else{
        s+='B';
    }
  }
  else
  {
    if(press("X"))
    {
        s+='X';
    }
    else{
        s+='Y';
    }
  }
//   cout<<"Cur "<<s<<endl;
  set<char> ap ={'A','B','X','Y'};
  ap.erase(s[0]);
  vector<char> pos(all(ap));
  for(int i=2;i<n;i++)
  {
    string qs=s+pos[0]+s+pos[1]+pos[0]+s+pos[1]+pos[1]+s+pos[1]+pos[2];
    int x=press(qs)-s.size();
    // cout<<"ASKEd "<<qs<<' '<<x<<endl;
    if(x==0)
    {
        s+=pos[2];
    }
    else if(x==1)
    {
        s+=pos[0];
    }
    else{
        s+=pos[1];
    }
  }
  if(press(s+pos[0])==s.size()+1)
  {
    s+=pos[0];
  }
  else if(press(s+pos[1])==s.size()+1)
  {
    s+=pos[1];
  }
  else{
    s+=pos[2];
  }
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:26:3: error: 'set' was not declared in this scope
   26 |   set<char> ap ={'A','B','X','Y'};
      |   ^~~
combo.cpp:2:1: note: 'std::set' is defined in header '<set>'; did you forget to '#include <set>'?
    1 | #include "combo.h"
  +++ |+#include <set>
    2 | using namespace std;
combo.cpp:26:7: error: expected primary-expression before 'char'
   26 |   set<char> ap ={'A','B','X','Y'};
      |       ^~~~
combo.cpp:27:3: error: 'ap' was not declared in this scope
   27 |   ap.erase(s[0]);
      |   ^~
combo.cpp:28:3: error: 'vector' was not declared in this scope
   28 |   vector<char> pos(all(ap));
      |   ^~~~~~
combo.cpp:2:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    1 | #include "combo.h"
  +++ |+#include <vector>
    2 | using namespace std;
combo.cpp:28:10: error: expected primary-expression before 'char'
   28 |   vector<char> pos(all(ap));
      |          ^~~~
combo.cpp:31:17: error: 'pos' was not declared in this scope
   31 |     string qs=s+pos[0]+s+pos[1]+pos[0]+s+pos[1]+pos[1]+s+pos[1]+pos[2];
      |                 ^~~
combo.cpp:46:14: error: 'pos' was not declared in this scope
   46 |   if(press(s+pos[0])==s.size()+1)
      |              ^~~