View Compilation Error

0_0_20910797_7093.cpp:9:11: error: size of array 'a' has non-integral type 'double'
 int a[maxn], b[maxn];
           ^
0_0_20910797_7093.cpp:9:20: error: size of array 'b' has non-integral type 'double'
 int a[maxn], b[maxn];
                    ^
0_0_20910797_7093.cpp:11:19: error: size of array 'w' has non-integral type 'double'
 vector<int> w[maxn];
                   ^
0_0_20910797_7093.cpp:12:13: error: size of array 'dep' has non-integral type 'double'
 int dep[maxn];
             ^
0_0_20910797_7093.cpp:13:15: error: size of array 'f' has non-integral type 'double'
 int f[maxn][20];
               ^
0_0_20910797_7093.cpp:16:13: error: size of array 'dfn' has non-integral type 'double'
 int dfn[maxn], tim;
             ^