View Compilation Error

0_0_26011927_22215.cpp:10:10: error: size of array 'F' has non-integral type 'double'
 int F[len];//F[i][0] for least, F[i][1] for number of methods
          ^
0_0_26011927_22215.cpp:11:10: error: size of array 'm' has non-integral type 'double'
 int m[len];
          ^
0_0_26011927_22215.cpp:12:11: error: size of array 'sm' has non-integral type 'double'
 int sm[len];//sm[i] is the first index that need i steps
           ^
0_0_26011927_22215.cpp:13:12: error: size of array 'sum' has non-integral type 'double'
 int sum[len];
            ^