View Compilation Error

0_0_37716564_5416.cpp: In function 'int main()':
0_0_37716564_5416.cpp:26:31: error: 'memset' was not declared in this scope
         memset(dp,0,sizeof(dp));
                               ^
0_0_37716564_5416.cpp:32:23: error: 'sort' was not declared in this scope
         sort(a+1,a+1+n);
                       ^