View Compilation Error

0_0_24500785_18018.c:4:5: error: variably modified 'head' at file scope
 int head[maxv], cur;
     ^
0_0_24500785_18018.c:5:8: error: variably modified 'dp' at file scope
 double dp[maxv][10010], ans[maxv];
        ^
0_0_24500785_18018.c:5:25: error: variably modified 'ans' at file scope
 double dp[maxv][10010], ans[maxv];
                         ^
0_0_24500785_18018.c:6:5: error: variably modified 'du' at file scope
 int du[maxv], n;
     ^
0_0_24500785_18018.c:9:3: error: variably modified 'edge' at file scope
 } edge[maxv*2];
   ^