/in/foo.cc:5:15: error: size of array 'f' has non-integral type 'double'
 int f[maxn][22];
               ^
/in/foo.cc:6:12: error: size of array 'sn' has non-integral type 'double'
 int sn[maxn];
            ^
/in/foo.cc:7:17: error: size of array 'as' has non-integral type 'double'
 int b,as[maxn][2];
                 ^