View Compilation Error

0_0_13613581_23258.cpp: In function 'void relabChar()':
0_0_13613581_23258.cpp:42:32: error: 'memset' was not declared in this scope
  memset(chars, 0, sizeof(chars));
                                ^
0_0_13613581_23258.cpp: In function 'void relabFace()':
0_0_13613581_23258.cpp:65:32: error: 'memset' was not declared in this scope
  memset(faces, 0, sizeof(faces));
                                ^