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View Compilation Error

0_0_29758231_6723.cpp: In function 'int main()':
0_0_29758231_6723.cpp:34:9: error: 'ios' has not been declared
         ios::sync_with_stdio(false);
         ^
0_0_29758231_6723.cpp:36:8: error: 'cin' was not declared in this scope
  while(cin>>n){
        ^
0_0_29758231_6723.cpp:36:8: note: suggested alternative:
In file included from 0_0_29758231_6723.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_29758231_6723.cpp:38:4: error: 'cout' was not declared in this scope
    cout << 1 << endl;
    ^
0_0_29758231_6723.cpp:38:4: note: suggested alternative:
In file included from 0_0_29758231_6723.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_29758231_6723.cpp:38:17: error: 'endl' was not declared in this scope
    cout << 1 << endl;
                 ^
0_0_29758231_6723.cpp:38:17: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_29758231_6723.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^
0_0_29758231_6723.cpp:47:3: error: 'cout' was not declared in this scope
   cout << maxx << endl;
   ^
0_0_29758231_6723.cpp:47:3: note: suggested alternative:
In file included from 0_0_29758231_6723.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_29758231_6723.cpp:47:19: error: 'endl' was not declared in this scope
   cout << maxx << endl;
                   ^
0_0_29758231_6723.cpp:47:19: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_29758231_6723.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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