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View Compilation Error

0_0_36094320_29093.cpp: In function 'int main()':
0_0_36094320_29093.cpp:10:12: error: 'cin' was not declared in this scope
     while (cin >> s1 >> s2) {
            ^
0_0_36094320_29093.cpp:10:12: 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_36094320_29093.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^


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