View Compilation Error

0_0_20292334_20335.cpp: In function 'int getPrime()':
0_0_20292334_20335.cpp:8:33: error: 'memset' was not declared in this scope
     memset(prime,0,sizeof(prime));
                                 ^
0_0_20292334_20335.cpp: In function 'int main()':
0_0_20292334_20335.cpp:43:28: error: 'memset' was not declared in this scope
     memset(dp,-1,sizeof(dp));
                            ^