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View Compilation Error

0_0_21503523_3872.cpp:2:7: error: expected nested-name-specifier before 'namece'
 using namece std;
       ^
0_0_21503523_3872.cpp: In function 'int main()':
0_0_21503523_3872.cpp:5:1: error: 'cin' was not declared in this scope
 cin>>t; 
 ^
0_0_21503523_3872.cpp:5:1: note: suggested alternative:
In file included from 0_0_21503523_3872.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_21503523_3872.cpp:8:1: error: 'cout' was not declared in this scope
 cout<<n/2+m/2<<endl; 
 ^
0_0_21503523_3872.cpp:8:1: note: suggested alternative:
In file included from 0_0_21503523_3872.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_21503523_3872.cpp:8:16: error: 'endl' was not declared in this scope
 cout<<n/2+m/2<<endl; 
                ^
0_0_21503523_3872.cpp:8:16: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_21503523_3872.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^


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