View Compilation Error

0_0_39207239_23958.cpp:2:1: error: '_int64' does not name a type
    2 | _int64 a[20],b[20];
      | ^~~~~~
0_0_39207239_23958.cpp: In function 'int main()':
0_0_39207239_23958.cpp:6:9: error: 'a' was not declared in this scope
    6 |         a[0]=0;
      |         ^
0_0_39207239_23958.cpp:8:9: error: 'b' was not declared in this scope
    8 |         b[0]=1;
      |         ^