View Compilation Error

0_0_29560495_26841.cpp: In member function 'void node::read()':
0_0_29560495_26841.cpp:17:23: error: 'memset' was not declared in this scope
   memset(A,0,sizeof(A));
                       ^
0_0_29560495_26841.cpp: In member function 'int node::count(int, int)':
0_0_29560495_26841.cpp:63:27: error: 'memset' was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^