foo.cc: In function 'void g(int*, int, int)':
foo.cc:7:2: error: reference to 'end' is ambiguous
    7 |  end=n-1;
      |  ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:9:15: error: reference to 'end' is ambiguous
    9 |  while(start<=end)
      |               ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:12:13: error: reference to 'end' is ambiguous
   12 |   if(start==end)
      |             ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:15:24: error: reference to 'end' is ambiguous
   15 |    mid=(key-a[start])*(end-start)/(a[end]-a[start]);
      |                        ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:15:38: error: reference to 'end' is ambiguous
   15 |    mid=(key-a[start])*(end-start)/(a[end]-a[start]);
      |                                      ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:21:4: error: reference to 'end' is ambiguous
   21 |    end=mid-1;
      |    ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~
foo.cc:28:11: error: reference to 'end' is ambiguous
   28 |  if(start>end)
      |           ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1244:5: note: candidates are: 'template<class _Tp> const _Tp* std::end(const std::valarray<_Tp>&)'
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
/usr/include/c++/9/valarray:1234:5: note:                 'template<class _Tp> _Tp* std::end(std::valarray<_Tp>&)'
 1234 |     end(valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/range_access.h:97:5: note:                 'template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])'
   97 |     end(_Tp (&__arr)[_Nm])
      |     ^~~
/usr/include/c++/9/bits/range_access.h:78:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(const _Container&)'
   78 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/9/bits/range_access.h:68:5: note:                 'template<class _Container> decltype (__cont.end()) std::end(_Container&)'
   68 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
In file included from /usr/include/c++/9/bits/range_access.h:36,
                 from /usr/include/c++/9/string:54,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/initializer_list:99:5: note:                 'template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
foo.cc:4:11: note:                 'int end'
    4 | int start,end,sum=0,mid;
      |           ^~~

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