View Compilation Error

0_0_23599663_29693.c:7:5: error: variably modified 'dis' at file scope
 int dis[maxn],dp[maxn][maxn],cost[maxn][maxn];
     ^
0_0_23599663_29693.c:7:15: error: variably modified 'dp' at file scope
 int dis[maxn],dp[maxn][maxn],cost[maxn][maxn];
               ^
0_0_23599663_29693.c:7:15: error: variably modified 'dp' at file scope
0_0_23599663_29693.c:7:30: error: variably modified 'cost' at file scope
 int dis[maxn],dp[maxn][maxn],cost[maxn][maxn];
                              ^
0_0_23599663_29693.c:7:30: error: variably modified 'cost' at file scope
0_0_23599663_29693.c: In function 'main':
0_0_23599663_29693.c:19:5: error: expected expression before '/' token
     //freopen("input.txt","r",stdin);
     ^