Submission #666883

#	Time	Username	Problem	Language	Result	Execution time	Memory
666883		teesla	Crayfish scrivener (IOI12_scrivener)	C++14	Compilation error	0 ms	0 KiB

scrivener

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

char last;
string prev,s;

void Init() {
  s="";
  return;
}

void TypeLetter(char L) {

  last = L;
  prev=s;
  s=s+last;
  return;

}

void UndoCommands(int U) {
  s=prev;
  return;
}

char GetLetter(int P) {

  return s[P];

}

Compilation message (stderr)

scrivener.cpp: In function 'void TypeLetter(char)':
scrivener.cpp:15:3: error: reference to 'prev' is ambiguous
   15 |   prev=s;
      |   ^~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:66,
                 from /usr/include/c++/10/bits/char_traits.h:39,
                 from /usr/include/c++/10/ios:40,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from scrivener.cpp:1:
/usr/include/c++/10/bits/stl_iterator_base_funcs.h:224:5: note: candidates are: 'template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)'
  224 |     prev(_BidirectionalIterator __x, typename
      |     ^~~~
scrivener.cpp:5:8: note:                 'std::string prev'
    5 | string prev,s;
      |        ^~~~
scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:22:5: error: reference to 'prev' is ambiguous
   22 |   s=prev;
      |     ^~~~
In file included from /usr/include/c++/10/bits/stl_algobase.h:66,
                 from /usr/include/c++/10/bits/char_traits.h:39,
                 from /usr/include/c++/10/ios:40,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from scrivener.cpp:1:
/usr/include/c++/10/bits/stl_iterator_base_funcs.h:224:5: note: candidates are: 'template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)'
  224 |     prev(_BidirectionalIterator __x, typename
      |     ^~~~
scrivener.cpp:5:8: note:                 'std::string prev'
    5 | string prev,s;
      |        ^~~~