View Compilation Error

0_0_10663914_1346.cpp: In function `int main()':
0_0_10663914_1346.cpp:23: error: `memset' undeclared (first use this function)
0_0_10663914_1346.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10663914_1346.cpp:32: error: `sqrt' undeclared (first use this function)