View Compilation Error

0_0_17555466_17351.cpp: In function 'int main()':
0_0_17555466_17351.cpp:13:4: error: '_int64' was not declared in this scope
    _int64 a[4];
    ^
0_0_17555466_17351.cpp:16:19: error: 'a' was not declared in this scope
    scanf("%I64d",&a[i]);
                   ^
0_0_17555466_17351.cpp:18:8: error: 'a' was not declared in this scope
   sort(a,a+4);
        ^