View Compilation Error

0_0_29415543_26470.cpp: In function 'void phi1()':
0_0_29415543_26470.cpp:14:29: error: 'memset' was not declared in this scope
     memset(phi,0,sizeof(phi));
                             ^
0_0_29415543_26470.cpp:16:25: error: 'N' was not declared in this scope
     for(long long i=2;i<N;i++)
                         ^
0_0_29415543_26470.cpp: In function 'int main()':
0_0_29415543_26470.cpp:100:8: error: 'Euler' was not declared in this scope
  Euler();
        ^