View Compilation Error

0_0_30219086_6045.cpp: In function 'int main()':
0_0_30219086_6045.cpp:20:31: error: 'memset' was not declared in this scope
         memset(dp,0,sizeof(dp));
                               ^
0_0_30219086_6045.cpp:25:23: error: 'sort' was not declared in this scope
         sort(a+1,a+n+1);
                       ^