View Compilation Error

0_0_16755051_24871.cpp: In function 'int main()':
0_0_16755051_24871.cpp:18:35: error: 'scanf' was not declared in this scope
 #define rush() int t;scanf("%d",&t);while(t--)
                                   ^
0_0_16755051_24871.cpp:35:2: note: in expansion of macro 'rush'
  rush()
  ^
0_0_16755051_24871.cpp:5:33: error: 'memset' was not declared in this scope
 #define C(a) memset(a,0,sizeof a)
                                 ^
0_0_16755051_24871.cpp:38:3: note: in expansion of macro 'C'
   C(a); C(dp);
   ^
0_0_16755051_24871.cpp:60:24: error: 'printf' was not declared in this scope
   printf("%I64d\n", ans);
                        ^