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View Compilation Error

0_0_39261540_25389.cpp: In function 'void sample12_6()':
0_0_39261540_25389.cpp:11:5: error: 'string' was not declared in this scope
   11 |     string a,b;
      |     ^~~~~~
0_0_39261540_25389.cpp:11:5: note: suggested alternatives:
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iosfwd:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:41,
                 from 0_0_39261540_25389.cpp:2:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/locale_classes.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ios_base.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:44:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:66:11: note:   'std::pmr::string'
   66 |     using string    = basic_string<char>;
      |           ^~~~~~
0_0_39261540_25389.cpp:12:11: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   12 |     while(cin>>a>>b){
      |           ^~~
      |           std::cin
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
0_0_39261540_25389.cpp:12:16: error: 'a' was not declared in this scope
   12 |     while(cin>>a>>b){
      |                ^
0_0_39261540_25389.cpp:12:19: error: 'b' was not declared in this scope
   12 |     while(cin>>a>>b){
      |                   ^
0_0_39261540_25389.cpp:20:34: error: 'max' was not declared in this scope
   20 |                     dp12_6[i][j]=max(dp12_6[i-1][j],dp12_6[i][j-1]);
      |                                  ^~~
0_0_39261540_25389.cpp:20:34: note: suggested alternatives:
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/algorithm:61,
                 from 0_0_39261540_25389.cpp:5:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_algo.h:5805:5: note:   'std::max'
 5805 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/algorithm:63:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ranges_algo.h:2928:29: note:   'std::ranges::max'
 2928 |   inline constexpr __max_fn max{};
      |                             ^~~
0_0_39261540_25389.cpp:24:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   24 |         cout<<dp12_6[a.size()][b.size()]<<endl;
      |         ^~~~
      |         std::cout
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
0_0_39261540_25389.cpp:24:43: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   24 |         cout<<dp12_6[a.size()][b.size()]<<endl;
      |                                           ^~~~
      |                                           std::endl
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:735:5: note: 'std::endl' declared here
  735 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~


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