foo.cc:4:5: error: 'int index' redeclared as different kind of entity
    4 | int index,ans;
      |     ^~~~~
In file included from /nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/string.h:462,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/cstring:42,
                 from stdc++.h:48:
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/strings.h:61:1: note: previous declaration 'const char* index(const char*, int)'
   61 | index (const char *__s, int __c) __THROW
      | ^~~~~
foo.cc: In function 'int main()':
foo.cc:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<s1.size();i++)
      |                 ~^~~~~~~~~~
foo.cc:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int i=0;i<s2.size();i++)
      |                 ~^~~~~~~~~~
foo.cc:14:18: error: no matching function for call to 'std::__cxx11::basic_string<char>::find(std::string&, <unresolved overloaded function type>)'
   14 |     while(s2.find(s1,index)!=-1)
      |           ~~~~~~~^~~~~~~~~~
In file included from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/string:53,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/locale_classes.h:40,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/ios_base.h:41,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/ios:42,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/istream:38,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/sstream:38,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/complex:45,
                 from /nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/ccomplex:39,
                 from stdc++.h:54:
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2605:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2605 |       find(const _CharT* __s, size_type __pos, size_type __n) const
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2605:7: note:   candidate expects 3 arguments, 2 provided
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2620:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2620 |       find(const basic_string& __str, size_type __pos = 0) const
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2620:49: note:   no known conversion for argument 2 from '<unresolved overloaded function type>' to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'}
 2620 |       find(const basic_string& __str, size_type __pos = 0) const
      |                                       ~~~~~~~~~~^~~~~~~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2654:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2654 |       find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2654:26: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
 2654 |       find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
      |            ~~~~~~~~~~~~~~^~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2672:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(_CharT, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2672 |       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2672:19: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char'
 2672 |       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
      |            ~~~~~~~^~~
foo.cc:16:22: error: no matching function for call to 'std::__cxx11::basic_string<char>::find(std::string&, <unresolved overloaded function type>)'
   16 |         index=s2.find(s1,index)+s1.size();
      |               ~~~~~~~^~~~~~~~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2605:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2605 |       find(const _CharT* __s, size_type __pos, size_type __n) const
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2605:7: note:   candidate expects 3 arguments, 2 provided
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2620:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2620 |       find(const basic_string& __str, size_type __pos = 0) const
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2620:49: note:   no known conversion for argument 2 from '<unresolved overloaded function type>' to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'}
 2620 |       find(const basic_string& __str, size_type __pos = 0) const
      |                                       ~~~~~~~~~~^~~~~~~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2654:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2654 |       find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2654:26: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
 2654 |       find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
      |            ~~~~~~~~~~~~~~^~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2672:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(_CharT, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2672 |       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
      |       ^~~~
/nix/store/jgdz5wfqc6q6qhy17lsqnfpbkfi1fcar-gcc-12.2.0/include/c++/12.2.0/bits/basic_string.h:2672:19: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char'
 2672 |       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
      |            ~~~~~~~^~~

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