View Compilation Error

0_0_30291560_12633.cpp:9:13: error: size of array 'vis' is not an integral constant-expression
 int vis[maxn];
             ^
0_0_30291560_12633.cpp:10:11: error: size of array 'x' is not an integral constant-expression
 int x[maxn], y[maxn];
           ^
0_0_30291560_12633.cpp:10:20: error: size of array 'y' is not an integral constant-expression
 int x[maxn], y[maxn];
                    ^