View Compilation Error

0_0_13998977_1542.cpp: In function 'void prim()':
0_0_13998977_1542.cpp:10:24: error: 'memset' was not declared in this scope
  memset(m2,0,sizeof(m2));
                        ^
0_0_13998977_1542.cpp: In function 'int main()':
0_0_13998977_1542.cpp:49:27: error: 'memset' was not declared in this scope
   memset(dis,0,sizeof(dis));
                           ^