Language: C++

#include<iostream>
using namespace std;
int main(){
  string s;
  int n,i,ans=0;
  cin >> n >> s;
  	for(i=0;i<n-2;i++){
  		if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
  		ans++;
  	}
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:20: error: 'a' was not declared in this scope
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                    ^
a.cc:8:49: error: expected ',' before '+' token
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                 ^
      |                                                 ,
a.cc:8:49: error: expected identifier before '+' token
a.cc: In lambda function:
a.cc:8:52: error: expected '{' before '==' token
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                    ^~
a.cc: In function 'int main()':
a.cc:8:52: error: no match for 'operator==' (operand types are 'main()::<lambda()>' and 'char')
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                               ~~~~~^~~~~
      |                                               |      |
      |                                               |      char
      |                                               main()::<lambda()>
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::fpos<_StateT>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
In file included from /usr/include/c++/14/string:43,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::allocator<_CharT>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::reverse_iterator<_Iterator>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::reverse_iterator<_Iterator>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::move_iterator<_IteratorL>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::move_iterator<_IteratorL>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::pair<_T1, _T2>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'char'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   'main()::<lambda()>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note:   template argument deduction/substitution failed:
a.cc:8:54: note:   mismatched types 'const _CharT*' and 'main()::<lambda()>'
    8 |                 if(a[i]=='A' && s[i+1]='B' && [i+2]=='C'){
      |                                                      ^~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2558:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::op