/in/foo.cc:3:1: error: '__int64' does not name a type
 __int64 a[300050];
 ^~~~~~~
/in/foo.cc:4:1: error: '__int64' does not name a type
 __int64 right[300050];
 ^~~~~~~
/in/foo.cc:5:1: error: '__int64' does not name a type
 __int64 left[300050];
 ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: '__int64' was not declared in this scope
  __int64  n,i;
  ^~~~~~~
/in/foo.cc:8:11: error: expected ';' before 'x'
  __int64  x,max;
           ^
/in/foo.cc:9:17: error: 'n' was not declared in this scope
  scanf("%I64d",&n);
                 ^
/in/foo.cc:10:9: error: 'a' was not declared in this scope
  memset(a,0,sizeof(a));
         ^
/in/foo.cc:11:7: error: 'i' was not declared in this scope
  for (i=1;i<=n;i++) scanf("%I64d",&a[i]);
       ^
/in/foo.cc:13:9: error: 'left' was not declared in this scope
  memset(left,0,sizeof(left));
         ^~~~
/in/foo.cc:14:9: error: 'right' was not declared in this scope
  memset(right,0,sizeof(right));
         ^~~~~
/in/foo.cc:16:7: error: 'i' was not declared in this scope
  for (i=2;i<=n;i++) {
       ^
/in/foo.cc:17:3: error: 'x' was not declared in this scope
   x=i-1;
   ^
/in/foo.cc:22:7: error: 'i' was not declared in this scope
  for (i=n-1;i>=1;i--){
       ^
/in/foo.cc:23:3: error: 'x' was not declared in this scope
   x=i+1;
   ^
/in/foo.cc:27:2: error: 'max' was not declared in this scope
  max=0;
  ^~~
/in/foo.cc:28:7: error: 'i' was not declared in this scope
  for (i=1;i<=n;i++) {
       ^
/in/foo.cc:34:7: error: 'i' was not declared in this scope
  for (i=2;i<=n;i++) {
       ^
/in/foo.cc:35:3: error: 'x' was not declared in this scope
   x=i-1;
   ^
/in/foo.cc:40:7: error: 'i' was not declared in this scope
  for (i=n-1;i>=1;i--){
       ^
/in/foo.cc:41:3: error: 'x' was not declared in this scope
   x=i+1;
   ^
/in/foo.cc:45:7: error: 'i' was not declared in this scope
  for (i=1;i<=n;i++) {
       ^