View Compilation Error

0_0_29300880_6426.cpp: In function 'int main(int, const char**)':
0_0_29300880_6426.cpp:71:10: error: 'cin' was not declared in this scope
   int t; cin >> t; int ca = 1;
          ^
0_0_29300880_6426.cpp:71:10: note: suggested alternative:
In file included from 0_0_29300880_6426.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
                  ^