View Compilation Error

0_0_32927262_17752.cpp: In function 'int main()':
0_0_32927262_17752.cpp:3:2: error: '__int64' was not declared in this scope
  __int64 a[1000],n;
  ^
0_0_32927262_17752.cpp:5:23: error: 'n' was not declared in this scope
  while(scanf("%I64d",&n)!=EOF)
                       ^
0_0_32927262_17752.cpp:5:24: error: 'scanf' was not declared in this scope
  while(scanf("%I64d",&n)!=EOF)
                        ^
0_0_32927262_17752.cpp:5:27: error: 'EOF' was not declared in this scope
  while(scanf("%I64d",&n)!=EOF)
                           ^
0_0_32927262_17752.cpp:9:21: error: 'a' was not declared in this scope
    scanf("%I64d%d",&a[i],&b[i]);
                     ^
0_0_32927262_17752.cpp:21:18: error: 'printf' was not declared in this scope
   printf("%d\n",j);
                  ^