View Compilation Error

0_0_11439895_21738.cpp: In function `void prim()':
0_0_11439895_21738.cpp:9: error: `memset' undeclared (first use this function)
0_0_11439895_21738.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11439895_21738.cpp: In function `int main()':
0_0_11439895_21738.cpp:42: error: `memset' undeclared (first use this function)