View Compilation Error

0_0_13302578_23629.c:5:5: error: variably modified 'w' at file scope
 int w[N],vis[N],head[N],num,p[N];
     ^
0_0_13302578_23629.c:5:10: error: variably modified 'vis' at file scope
 int w[N],vis[N],head[N],num,p[N];
          ^
0_0_13302578_23629.c:5:17: error: variably modified 'head' at file scope
 int w[N],vis[N],head[N],num,p[N];
                 ^
0_0_13302578_23629.c:5:29: error: variably modified 'p' at file scope
 int w[N],vis[N],head[N],num,p[N];
                             ^
0_0_13302578_23629.c:9:2: error: variably modified 'e' at file scope
 }e[N*4];
  ^