View Compilation Error

0_0_24167179_13714.cpp: In function 'int main()':
0_0_24167179_13714.cpp:8:25: error: 'memset' was not declared in this scope
   memset(dp,0,sizeof(dp));
                         ^
0_0_24167179_13714.cpp:12:17: error: 'sort' was not declared in this scope
   sort(w+1,w+1+n);
                 ^