View Compilation Error

0_0_30018518_6738.cpp: In function 'void get_sg(int)':
0_0_30018518_6738.cpp:15:22: error: 'f' was not declared in this scope
         for(int j=0; f[j]<=i&&j<n; j++)
                      ^
0_0_30018518_6738.cpp:15:33: error: 'n' was not declared in this scope
         for(int j=0; f[j]<=i&&j<n; j++)
                                 ^