View Compilation Error

0_0_20650667_20253.cpp: In function 'void init()':
0_0_20650667_20253.cpp:12:36: error: 'memset' was not declared in this scope
 #define mset(a) memset(a,0,sizeof a)
                                    ^
0_0_20650667_20253.cpp:20:2: note: in expansion of macro 'mset'
  mset(num);
  ^
0_0_20650667_20253.cpp: In function 'void DP()':
0_0_20650667_20253.cpp:12:36: error: 'memset' was not declared in this scope
 #define mset(a) memset(a,0,sizeof a)
                                    ^
0_0_20650667_20253.cpp:30:2: note: in expansion of macro 'mset'
  mset(dp);
  ^