View Compilation Error

0_0_28158300_26933.cpp: In function 'int main()':
0_0_28158300_26933.cpp:165:20: error: 'f' was not declared in this scope
   For(i, 1, N - 1) f[i] = 0;
                    ^
0_0_28158300_26933.cpp:165:20: note: suggested alternative:
0_0_28158300_26933.cpp:89:13: note:   'Inv::f'
  static int f[MAXN];
             ^
0_0_28158300_26933.cpp:167:17: error: 'f' was not declared in this scope
  printf("%d\n", f[0]);
                 ^
0_0_28158300_26933.cpp:167:17: note: suggested alternative:
0_0_28158300_26933.cpp:89:13: note:   'Inv::f'
  static int f[MAXN];
             ^