View Compilation Error

0_0_24826158_32137.cpp: In function 'int main()':
0_0_24826158_32137.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 arr[21];
  ^
0_0_24826158_32137.cpp:7:2: error: 'arr' was not declared in this scope
  arr[1]=0;arr[2]=1;
  ^