View Compilation Error

0_0_28895985_15192.cpp: In function 'int main()':
0_0_28895985_15192.cpp:11:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                     ^
0_0_28895985_15192.cpp:11:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                        ^
0_0_28895985_15192.cpp:12:24: error: 'printf' was not declared in this scope
   printf("%lld\n",dp[n]);
                        ^