View Compilation Error

0_0_23188598_9513.cpp: In function 'int main()':
0_0_23188598_9513.cpp:8:19: error: expected ';' before 'memset'
 #define mem(a,b)  memset(a,b,sizeof(a))
                   ^
0_0_23188598_9513.cpp:62:9: note: in expansion of macro 'mem'
         mem(first,-1);
         ^