Submission #894414

#	Time	Username	Problem	Language	Result	Execution time	Memory
894414		AtabayRajabli	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

std::string guess_sequence(int N)
{
  string p = "ABXY";
  string res = "";
  if(press("A"))res = "A";
  else if(press("B"))res = "B";
  else if(press("X"))res = "X";
  else (press("Y"))res = "Y";

  while(res.size() < N)
  {
    for(char c : p)
    {
      if(c == res[0])continue;
      if(press(res + c) == res.size() + 1)
      {
        res += c;
        break;
      }
    }
  }

  return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:6:3: error: 'string' was not declared in this scope
    6 |   string p = "ABXY";
      |   ^~~~~~
combo.cpp:6:3: note: suggested alternatives:
In file included from /usr/include/c++/10/string:39,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/bits/stringfwd.h:79:33: note:   'std::string'
   79 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/string:67:11: note:   'std::pmr::string'
   67 |     using string    = basic_string<char>;
      |           ^~~~~~
combo.cpp:7:9: error: expected ';' before 'res'
    7 |   string res = "";
      |         ^~~~
      |         ;
combo.cpp:8:17: error: 'res' was not declared in this scope
    8 |   if(press("A"))res = "A";
      |                 ^~~
combo.cpp:9:22: error: 'res' was not declared in this scope
    9 |   else if(press("B"))res = "B";
      |                      ^~~
combo.cpp:10:22: error: 'res' was not declared in this scope
   10 |   else if(press("X"))res = "X";
      |                      ^~~
combo.cpp:11:20: error: expected ';' before 'res'
   11 |   else (press("Y"))res = "Y";
      |                    ^~~
      |                    ;
combo.cpp:13:9: error: 'res' was not declared in this scope
   13 |   while(res.size() < N)
      |         ^~~
combo.cpp:15:18: error: 'p' was not declared in this scope
   15 |     for(char c : p)
      |                  ^
combo.cpp:26:10: error: 'res' was not declared in this scope
   26 |   return res;
      |          ^~~