View Compilation Error

0_0_25954411_21351.cpp:8:10: error: array bound is not an integer constant before ']' token
 LL f[maxn] , fv[maxn];
          ^
0_0_25954411_21351.cpp:8:21: error: array bound is not an integer constant before ']' token
 LL f[maxn] , fv[maxn];
                     ^
0_0_25954411_21351.cpp: In function 'void init()':
0_0_25954411_21351.cpp:23:5: error: 'f' was not declared in this scope
     f[0] = 1;
     ^
0_0_25954411_21351.cpp:26:5: error: 'fv' was not declared in this scope
     fv[maxn-1] = quick_power(f[maxn-1],mod-2);
     ^
0_0_25954411_21351.cpp: In function 'LL C(LL, LL)':
0_0_25954411_21351.cpp:36:3: error: 'f' was not declared in this scope
   f[n]*(fv[m])%mod*fv[n-m]%mod;
   ^
0_0_25954411_21351.cpp:36:9: error: 'fv' was not declared in this scope
   f[n]*(fv[m])%mod*fv[n-m]%mod;
         ^