View Compilation Error

0_0_17938384_12222.cpp: In function 'int main()':
0_0_17938384_12222.cpp:74:25: error: 'sort' was not declared in this scope
         sort(a,a+r,cramp);
                         ^
0_0_17938384_12222.cpp:77:26: error: 'memset' was not declared in this scope
   memset(dp,-1,sizeof(dp));
                          ^