View Compilation Error

0_0_23345960_10818.cpp: In function 'double prim(double (*)[105], int)':
0_0_23345960_10818.cpp:24:33: error: 'memset' was not declared in this scope
 memset(visit,false,sizeof(visit));
                                 ^
0_0_23345960_10818.cpp: In function 'int main()':
0_0_23345960_10818.cpp:54:25: error: 'memset' was not declared in this scope
 memset(num,0,sizeof(num));
                         ^