View Compilation Error

0_0_35048051_30308.cpp:2:1: error: '_int64' does not name a type
 _int64 ver(_int64 n)//要用64位的类型，要不过不了！
 ^
0_0_35048051_30308.cpp: In function 'int main()':
0_0_35048051_30308.cpp:23:2: error: '_int64' was not declared in this scope
  _int64 n1,n2,flag,a[1000],i;
  ^
0_0_35048051_30308.cpp:24:23: error: 'n1' was not declared in this scope
  while(scanf("%I64d",&n1)!=EOF)
                       ^
0_0_35048051_30308.cpp:26:3: error: 'n2' was not declared in this scope
   n2=ver(n1);
   ^
0_0_35048051_30308.cpp:26:12: error: 'ver' was not declared in this scope
   n2=ver(n1);
            ^
0_0_35048051_30308.cpp:27:3: error: 'flag' was not declared in this scope
   flag=1;
   ^
0_0_35048051_30308.cpp:28:3: error: 'a' was not declared in this scope
   a[flag++]=n1;
   ^
0_0_35048051_30308.cpp:37:7: error: 'i' was not declared in this scope
   for(i=1;i<=flag;i++)
       ^