foo.cc: In function ‘void Change(std::string, std::string, std::string)’:
foo.cc:28:13: warning: unused variable ‘n3’ [-Wunused-variable]
   28 |         int n3=s3.length();
      |             ^~
foo.cc: In function ‘int main()’:
foo.cc:49:31: error: no matching function for call to ‘getline(std::istream&, std::string [100000])’
   49 |         string s1[N];  getline(cin,s1);
      |                        ~~~~~~~^~~~~~~~
In file included from /nix/gcc-14-20241116/include/c++/14-20241116/string:55,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/bits/locale_classes.h:40,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/bits/ios_base.h:41,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/ios:44,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/ostream:40,
                 from iostream:41:
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
  907 |     getline(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note:   candidate expects 3 arguments, 2 provided
In file included from /nix/gcc-14-20241116/include/c++/14-20241116/string:54:
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4117 |     getline(basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note:   template argument deduction/substitution failed:
foo.cc:49:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   49 |         string s1[N];  getline(cin,s1);
      |                        ~~~~~~~^~~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
 4125 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note:   candidate expects 3 arguments, 2 provided
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4132 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note:   template argument deduction/substitution failed:
foo.cc:49:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   49 |         string s1[N];  getline(cin,s1);
      |                        ~~~~~~~^~~~~~~~
In file included from /nix/glibc-2.40-66-dev/include/stdio.h:966,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/cstdio:42,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/ext/string_conversions.h:45,
                 from /nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4154:
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note: candidate: ‘__ssize_t getline(char**, size_t*, FILE*)’
  118 | getline (char **__lineptr, size_t *__n, FILE *__stream)
      | ^~~~~~~
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note:   candidate expects 3 arguments, 2 provided
foo.cc:50:31: error: no matching function for call to ‘getline(std::istream&, std::string [100000])’
   50 |         string s2[N];  getline(cin,s2);
      |                        ~~~~~~~^~~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
  907 |     getline(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note:   candidate expects 3 arguments, 2 provided
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4117 |     getline(basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note:   template argument deduction/substitution failed:
foo.cc:50:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   50 |         string s2[N];  getline(cin,s2);
      |                        ~~~~~~~^~~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
 4125 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note:   candidate expects 3 arguments, 2 provided
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4132 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note:   template argument deduction/substitution failed:
foo.cc:50:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   50 |         string s2[N];  getline(cin,s2);
      |                        ~~~~~~~^~~~~~~~
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note: candidate: ‘__ssize_t getline(char**, size_t*, FILE*)’
  118 | getline (char **__lineptr, size_t *__n, FILE *__stream)
      | ^~~~~~~
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note:   candidate expects 3 arguments, 2 provided
foo.cc:51:31: error: no matching function for call to ‘getline(std::istream&, std::string [100000])’
   51 |         string s3[N];  getline(cin,s3);
      |                        ~~~~~~~^~~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
  907 |     getline(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.tcc:907:5: note:   candidate expects 3 arguments, 2 provided
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4117 |     getline(basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4117:5: note:   template argument deduction/substitution failed:
foo.cc:51:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   51 |         string s3[N];  getline(cin,s3);
      |                        ~~~~~~~^~~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
 4125 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4125:5: note:   candidate expects 3 arguments, 2 provided
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(basic_istream<_CharT, _Traits>&&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 4132 |     getline(basic_istream<_CharT, _Traits>&& __is,
      |     ^~~~~~~
/nix/gcc-14-20241116/include/c++/14-20241116/bits/basic_string.h:4132:5: note:   template argument deduction/substitution failed:
foo.cc:51:31: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string [100000]’ {aka ‘std::__cxx11::basic_string<char> [100000]’}
   51 |         string s3[N];  getline(cin,s3);
      |                        ~~~~~~~^~~~~~~~
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note: candidate: ‘__ssize_t getline(char**, size_t*, FILE*)’
  118 | getline (char **__lineptr, size_t *__n, FILE *__stream)
      | ^~~~~~~
/nix/glibc-2.40-66-dev/include/bits/stdio.h:118:1: note:   candidate expects 3 arguments, 2 provided
foo.cc:52:16: error: could not convert ‘(std::string*)(& s1)’ from ‘std::string*’ {aka ‘std::__cxx11::basic_string<char>*’} to ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’}
   52 |         Change(s1,s2,s3);
      |                ^~
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}