View Compilation Error

0_0_19443627_27758.cpp: In function 'int main()':
0_0_19443627_27758.cpp:16:10: error: 'dp' was not declared in this scope
   memset(dp, 0, sizeof(dp) ); 
          ^
0_0_19443627_27758.cpp:16:28: error: 'memset' was not declared in this scope
   memset(dp, 0, sizeof(dp) ); 
                            ^