View Compilation Error

0_0_39626689_30388.cpp:9:29: error: size of array 'sum' is not an integral constant-expression
    9 | int n=105,m=1005,sum[n<<2][m<<2];
      |                            ~^~~
0_0_39626689_30388.cpp:9:23: error: size of array 'sum' is not an integral constant-expression
    9 | int n=105,m=1005,sum[n<<2][m<<2];
      |                      ~^~~