View Compilation Error

0_0_14042743_14383.cpp: In function 'int main()':
0_0_14042743_14383.cpp:10:4: error: 'cin' was not declared in this scope
    cin >> t;
    ^
0_0_14042743_14383.cpp:10:4: note: suggested alternative:
In file included from 0_0_14042743_14383.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_14042743_14383.cpp:19:27: error: 'memset' was not declared in this scope
       memset(b,0,sizeof(b));
                           ^
0_0_14042743_14383.cpp:23:33: error: 'max' was not declared in this scope
            cmax  = max(cmax,a[i]);
                                 ^
0_0_14042743_14383.cpp:23:33: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_14042743_14383.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3454:5: note:   'std::max'
     max(initializer_list<_Tp> __l, _Compare __comp)
     ^