View Compilation Error

0_0_18319230_22022.cpp: In function 'int KM()':
0_0_18319230_22022.cpp:5:38: error: 'memset' was not declared in this scope
 #define MEM(a,b) memset(a,b,sizeof(a))
                                      ^
0_0_18319230_22022.cpp:32:2: note: in expansion of macro 'MEM'
  MEM(match,-1), MEM(expt,0);
  ^