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View Compilation Error

0_0_35881243_3457.cpp: In function 'int main()':
0_0_35881243_3457.cpp:5:8: error: 'cin' was not declared in this scope
  while(cin>>n&&n){
        ^
0_0_35881243_3457.cpp:5:8: note: suggested alternative:
In file included from 0_0_35881243_3457.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_35881243_3457.cpp:6:3: error: 'map' was not declared in this scope
   map<string,int> maps;
   ^
0_0_35881243_3457.cpp:6:3: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:61:0,
                 from 0_0_35881243_3457.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:96:11: note:   'std::map'
     class map
           ^
0_0_35881243_3457.cpp:6:7: error: 'string' was not declared in this scope
   map<string,int> maps;
       ^
0_0_35881243_3457.cpp:6:7: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_35881243_3457.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stringfwd.h:62:33: note:   'std::string'
   typedef basic_string<char>    string;   
                                 ^
0_0_35881243_3457.cpp:6:14: error: expected primary-expression before 'int'
   map<string,int> maps;
              ^
0_0_35881243_3457.cpp:7:10: error: expected ';' before 's'
   string s,k;
          ^
0_0_35881243_3457.cpp:10:9: error: 's' was not declared in this scope
    cin>>s;
         ^
0_0_35881243_3457.cpp:11:4: error: 'maps' was not declared in this scope
    maps[s]+=1;
    ^
0_0_35881243_3457.cpp:14:5: error: 'k' was not declared in this scope
     k=s;
     ^
0_0_35881243_3457.cpp:17:2: error: 'cout' was not declared in this scope
  cout<<k<<endl;
  ^
0_0_35881243_3457.cpp:17:2: note: suggested alternative:
In file included from 0_0_35881243_3457.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_35881243_3457.cpp:17:8: error: 'k' was not declared in this scope
  cout<<k<<endl;
        ^
0_0_35881243_3457.cpp:17:11: error: 'endl' was not declared in this scope
  cout<<k<<endl;
           ^
0_0_35881243_3457.cpp:17:11: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_35881243_3457.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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