View Compilation Error

0_0_35717968_30787.cpp: In member function 'void hshmp::init()':
0_0_35717968_30787.cpp:20:34: error: 'memset' was not declared in this scope
   memset(hshmp, -1, sizeof(hshmp));
                                  ^
0_0_35717968_30787.cpp: In function 'int main()':
0_0_35717968_30787.cpp:48:27: error: 'memset' was not declared in this scope
   memset(dp, 0, sizeof(dp));
                           ^