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View Compilation Error

0_0_38142419_18069.cpp: In function 'int main()':
0_0_38142419_18069.cpp:7:9: error: 'cin' was not declared in this scope
  while (cin >> s)
         ^
0_0_38142419_18069.cpp:7:9: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_38142419_18069.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_38142419_18069.cpp:10:16: error: 'sort' was not declared in this scope
   sort(s, s + b);
                ^
0_0_38142419_18069.cpp:10:16: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_38142419_18069.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^


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