View Compilation Error

0_0_39287582_20098.cpp: In function 'int main()':
0_0_39287582_20098.cpp:4:5: error: '__int64' was not declared in this scope
    4 |     __int64 ar[50];
      |     ^~~~~~~
0_0_39287582_20098.cpp:5:12: error: 'scanf' was not declared in this scope
    5 |     while( scanf("%d",&n)!=EOF)
      |            ^~~~~
0_0_39287582_20098.cpp:5:28: error: 'EOF' was not declared in this scope
    5 |     while( scanf("%d",&n)!=EOF)
      |                            ^~~
0_0_39287582_20098.cpp:1:1: note: 'EOF' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
  +++ |+#include <cstdio>
    1 | int main()
0_0_39287582_20098.cpp:7:9: error: 'ar' was not declared in this scope
    7 |         ar[0]=3;
      |         ^~
0_0_39287582_20098.cpp:12:9: error: 'printf' was not declared in this scope
   12 |         printf("%I64d\n",ar[n-1]);
      |         ^~~~~~
0_0_39287582_20098.cpp:12:9: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?