Language: C++

#include<bits/stdc++.h>
     using namespace std;
     ],b[];
     ],sumb[];
     int main()
     {
         int n;
         while(cin>>n){
             ;i<n;i++){
                 cin>>a[i];
             }
             ;i<n;i++){
                 cin>>b[i];
             }
             suma[]=a[];sumb[]=b[];
             ;i<n;i++){
                 suma[i]=suma[i-]+a[i];
                 sumb[i]=sumb[i-]+b[i];
             }
             ]+sumb[n-];
             ;i<n;i++){
                 ]-sumb[i-];
                 maxn=max(maxn,sum);
             }
             cout<<maxn<<endl;
         }
         ;
     }#include<bits/stdc++.h>
     using namespace std;
     ],b[];
     ],sumb[];
     int main()
     {
         int n;
         while(cin>>n){
             ;i<n;i++){
                 cin>>a[i];
             }
             ;i<n;i++){
                 cin>>b[i];
             }
             suma[]=a[];sumb[]=b[];
             ;i<n;i++){
                 suma[i]=suma[i-]+a[i];
                 sumb[i]=sumb[i-]+b[i];
             }
             ]+sumb[n-];
             ;i<n;i++){
                 ]-sumb[i-];
                 maxn=max(maxn,sum);
             }
             cout<<maxn<<endl;
         }
         ;
     }

Compiler output:
a.cc:28:7: error: stray '#' in program
   28 |      }#include<bits/stdc++.h>
      |       ^
a.cc:3:6: error: expected unqualified-id before ']' token
    3 |      ],b[];
      |      ^
a.cc:4:6: error: expected unqualified-id before ']' token
    4 |      ],sumb[];
      |      ^
a.cc: In function 'int main()':
a.cc:9:15: error: 'i' was not declared in this scope
    9 |              ;i<n;i++){
      |               ^
a.cc:15:14: error: 'suma' was not declared in this scope
   15 |              suma[]=a[];sumb[]=b[];
      |              ^~~~
a.cc:15:19: error: expected primary-expression before ']' token
   15 |              suma[]=a[];sumb[]=b[];
      |                   ^
a.cc:15:21: error: 'a' was not declared in this scope
   15 |              suma[]=a[];sumb[]=b[];
      |                     ^
a.cc:15:23: error: expected primary-expression before ']' token
   15 |              suma[]=a[];sumb[]=b[];
      |                       ^
a.cc:15:25: error: 'sumb' was not declared in this scope
   15 |              suma[]=a[];sumb[]=b[];
      |                         ^~~~
a.cc:15:30: error: expected primary-expression before ']' token
   15 |              suma[]=a[];sumb[]=b[];
      |                              ^
a.cc:15:32: error: 'b' was not declared in this scope
   15 |              suma[]=a[];sumb[]=b[];
      |                                ^
a.cc:15:34: error: expected primary-expression before ']' token
   15 |              suma[]=a[];sumb[]=b[];
      |                                  ^
a.cc:20:14: error: expected primary-expression before ']' token
   20 |              ]+sumb[n-];
      |              ^
a.cc:25:20: error: 'maxn' was not declared in this scope; did you mean 'main'?
   25 |              cout<<maxn<<endl;
      |                    ^~~~
      |                    main
a.cc: At global scope:
a.cc:28:8: error: 'include' does not name a type
   28 |      }#include<bits/stdc++.h>
      |        ^~~~~~~
a.cc:30:6: error: expected unqualified-id before ']' token
   30 |      ],b[];
      |      ^
a.cc:31:6: error: expected unqualified-id before ']' token
   31 |      ],sumb[];
      |      ^
a.cc:32:10: error: redefinition of 'int main()'
   32 |      int main()
      |          ^~~~
a.cc:5:10: note: 'int main()' previously defined here
    5 |      int main()
      |          ^~~~
a.cc: In function 'int main()':
a.cc:36:15: error: 'i' was not declared in this scope
   36 |              ;i<n;i++){
      |               ^
a.cc:42:14: error: 'suma' was not declared in this scope
   42 |              suma[]=a[];sumb[]=b[];
      |              ^~~~
a.cc:42:19: error: expected primary-expression before ']' token
   42 |              suma[]=a[];sumb[]=b[];
      |                   ^
a.cc:42:21: error: 'a' was not declared in this scope
   42 |              suma[]=a[];sumb[]=b[];
      |                     ^
a.cc:42:23: error: expected primary-expression before ']' token
   42 |              suma[]=a[];sumb[]=b[];
      |                       ^
a.cc:42:25: error: 'sumb' was not declared in this scope
   42 |              suma[]=a[];sumb[]=b[];
      |                         ^~~~
a.cc:42:30: error: expected primary-expression before ']' token
   42 |              suma[]=a[];sumb[]=b[];
      |                              ^
a.cc:42:32: error: 'b' was not declared in this scope
   42 |              suma[]=a[];sumb[]=b[];
      |                                ^
a.cc:42:34: error: expected primary-expression before ']' token
   42 |              suma[]=a[];sumb[]=b[];
      |                                  ^
a.cc:47:14: error: expected primary-expression before ']' token
   47 |              ]+sumb[n-];
      |              ^
a.cc:52:20: error: 'maxn' was not declared in this scope; did you mean 'main'?
   52 |              cout<<maxn<<endl;
      |                    ^~~~
      |                    main