/in/foo.cc:51:16: error: 'ostream' does not name a type
   51 |         friend ostream&operator<<(ostream&out,const Matrix3& other){
      |                ^~~~~~~
/in/foo.cc:70:2: error: expected '}' at end of input
   70 | }
      |  ^
/in/foo.cc:2:15: note: to match this '{'
    2 | class Matrix3 {
      |               ^
/in/foo.cc: In member function 'Matrix3 Matrix3::operator+(const Matrix3&) const':
/in/foo.cc:14:17: error: 'Marrix3' was not declared in this scope; did you mean 'Matrix3'?
   14 |                 Marrix3 a;
      |                 ^~~~~~~
      |                 Matrix3
/in/foo.cc:17:34: error: 'a' was not declared in this scope
   17 |                                  a.v[i][j]=v[i][j]+other.v[i][j];
      |                                  ^
/in/foo.cc:20:24: error: 'a' was not declared in this scope
   20 |                 return a;
      |                        ^
/in/foo.cc: In member function 'Matrix3 Matrix3::operator-(const Matrix3&) const':
/in/foo.cc:23:17: error: 'Marrix3' was not declared in this scope; did you mean 'Matrix3'?
   23 |                 Marrix3 a;
      |                 ^~~~~~~
      |                 Matrix3
/in/foo.cc:26:34: error: 'a' was not declared in this scope
   26 |                                  a.v[i][j]=v[i][j]-other.v[i][j];
      |                                  ^
/in/foo.cc:29:24: error: 'a' was not declared in this scope
   29 |                 return a;
      |                        ^
/in/foo.cc: In member function 'Matrix3 Matrix3::operator*(int) const':
/in/foo.cc:32:17: error: 'Marrix3' was not declared in this scope; did you mean 'Matrix3'?
   32 |                 Marrix3 a;
      |                 ^~~~~~~
      |                 Matrix3
/in/foo.cc:35:34: error: 'a' was not declared in this scope
   35 |                                  a.v[i][j]=v[i][j]*k;
      |                                  ^
/in/foo.cc:38:24: error: 'a' was not declared in this scope
   38 |                 return a;
      |                        ^
/in/foo.cc: In member function 'int Matrix3::main()':
/in/foo.cc:64:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   64 |         cin>>k;
      |         ^~~
      |         std::cin
In file included from /in/foo.cc:1:
/usr/include/c++/12/iostream:60:18: note: 'std::cin' declared here
   60 |   extern istream cin;           /// Linked to standard input
      |                  ^~~
/in/foo.cc:67:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   67 |         cout<<(m1+m2-m3)*k<<endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/12/iostream:61:18: note: 'std::cout' declared here
   61 |   extern ostream cout;          /// Linked to standard output
      |                  ^~~~
/in/foo.cc:67:29: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   67 |         cout<<(m1+m2-m3)*k<<endl;
      |                             ^~~~
      |                             std::endl
In file included from /usr/include/c++/12/iostream:39:
/usr/include/c++/12/ostream:688:5: note: 'std::endl' declared here
  688 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
/in/foo.cc: At global scope:
/in/foo.cc:70:2: error: expected unqualified-id at end of input
   70 | }
      |  ^