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View Compilation Error

0_0_31823607_2225.cpp: In function 'int main()':
0_0_31823607_2225.cpp:6:2: error: 'string' was not declared in this scope
  string a,b,c;
  ^
0_0_31823607_2225.cpp:6:2: 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_31823607_2225.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_31823607_2225.cpp:8:8: error: 'cin' was not declared in this scope
  while(cin>>a>>b)
        ^
0_0_31823607_2225.cpp:8:8: note: suggested alternative:
In file included from 0_0_31823607_2225.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_31823607_2225.cpp:8:13: error: 'a' was not declared in this scope
  while(cin>>a>>b)
             ^
0_0_31823607_2225.cpp:8:16: error: 'b' was not declared in this scope
  while(cin>>a>>b)
                ^
0_0_31823607_2225.cpp:12:3: error: 'c' was not declared in this scope
   c=a.substr(0,a.length()-1);
   ^
0_0_31823607_2225.cpp:23:12: error: 'cout' was not declared in this scope
   if(flag) cout<<"yes"<<endl;
            ^
0_0_31823607_2225.cpp:23:12: note: suggested alternative:
In file included from 0_0_31823607_2225.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_31823607_2225.cpp:23:25: error: 'endl' was not declared in this scope
   if(flag) cout<<"yes"<<endl;
                         ^
0_0_31823607_2225.cpp:23:25: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_31823607_2225.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_31823607_2225.cpp:24:8: error: 'cout' was not declared in this scope
   else cout<<"no"<<endl;
        ^
0_0_31823607_2225.cpp:24:8: note: suggested alternative:
In file included from 0_0_31823607_2225.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_31823607_2225.cpp:24:20: error: 'endl' was not declared in this scope
   else cout<<"no"<<endl;
                    ^
0_0_31823607_2225.cpp:24:20: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_31823607_2225.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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