View Compilation Error

0_0_19680079_26500.cpp: In function 'void init()':
0_0_19680079_26500.cpp:28:25: error: 'memset' was not declared in this scope
  memset(H, -1, sizeof(H));//head填充-1
                         ^
0_0_19680079_26500.cpp: In function 'int h()':
0_0_19680079_26500.cpp:69:28: error: 'memset' was not declared in this scope
  memset(vis, 0, sizeof(vis));
                            ^