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View Compilation Error

0_0_38572825_29301.cpp: In function 'int main()':
0_0_38572825_29301.cpp:8:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^~~
0_0_38572825_29301.cpp:8:5: note: suggested alternative:
In file included from 0_0_38572825_29301.cpp:3:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
0_0_38572825_29301.cpp:8:10: error: 't' was not declared in this scope
     cin>>t;
          ^
0_0_38572825_29301.cpp:26:9: error: 'cout' was not declared in this scope
         cout<<ans<<endl;
         ^~~~
0_0_38572825_29301.cpp:26:9: note: suggested alternative:
In file included from 0_0_38572825_29301.cpp:3:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
0_0_38572825_29301.cpp:26:20: error: 'endl' was not declared in this scope
         cout<<ans<<endl;
                    ^~~~
0_0_38572825_29301.cpp:26:20: note: suggested alternative:
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:39,
                 from 0_0_38572825_29301.cpp:3:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ostream:593:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~


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