View Compilation Error

0_0_18404896_29910.cpp:2:21: error: 'a' does not name a type
 using namespace std;a
                     ^
0_0_18404896_29910.cpp:4:1: error: 'll' does not name a type
 ll dp[5005][3];
 ^
0_0_18404896_29910.cpp: In function 'int main()':
0_0_18404896_29910.cpp:20:16: error: 'dp' was not declared in this scope
         memset(dp,0,sizeof(dp));
                ^