View Compilation Error

0_0_2760563_20330.cpp: In function `void BFS()':
0_0_2760563_20330.cpp:43: error: `memset' undeclared (first use this function)
0_0_2760563_20330.cpp:43: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2760563_20330.cpp:46: error: `memcpy' undeclared (first use this function)