View Compilation Error

0_0_21165649_1037.cpp:33:1: error: expected primary-expression before 'using'
 using namespace std;
 ^
0_0_21165649_1037.cpp:38:11: error: redefinition of 'const int MX'
 const int MX = 2e4 + 10;
           ^
0_0_21165649_1037.cpp:10:11: note: 'const int MX' previously defined here
 const int MX = 
           ^
0_0_21165649_1037.cpp:41:9: error: size of array 'V' is not an integral constant-expression
 int V[MX], C[MX];
         ^
0_0_21165649_1037.cpp:41:16: error: size of array 'C' is not an integral constant-expression
 int V[MX], C[MX];
                ^
0_0_21165649_1037.cpp:42:10: error: size of array 'dp' is not an integral constant-expression
 int dp[MX];
          ^