View Compilation Error

0_0_22025239_26268.cpp: In function 'void getSG(int, int)':
0_0_22025239_26268.cpp:9:5: error: 'i' was not declared in this scope
  f2(i,1,fn) f[i] = i;
     ^
0_0_22025239_26268.cpp:9:11: error: 'f2' was not declared in this scope
  f2(i,1,fn) f[i] = i;
           ^