View Compilation Error

0_0_25909749_2025.cpp: In function 'void init()':
0_0_25909749_2025.cpp:23:36: error: 'memset' was not declared in this scope
  memset(f_prime, 0, sizeof(f_prime));
                                    ^
0_0_25909749_2025.cpp: In function 'void find_l(int)':
0_0_25909749_2025.cpp:40:44: error: 'memset' was not declared in this scope
  memset(last_prime, 0x0, sizeof(last_prime));
                                            ^
0_0_25909749_2025.cpp: In function 'int main()':
0_0_25909749_2025.cpp:117:31: error: 'memset' was not declared in this scope
   memset(tree, 0, sizeof(tree));
                               ^