Language: C++

#include<bits/stdc++.h>
using namespace std;


  
  

int main(){
  int H,W;
  cin>>H>>W;
  long long res=0;
  
  bool grid[2010][2010];
  for(int i=0; i<H; i++){
    for(int j=0; j<W; j++){
      string a;
       cin>>a
  if(a=='.') grid[i][j]=true;
      else grid[i][j]=false;
    }
  }
  
   for(int i=0; i<H; i++){
    for(int j=0; j<W; j++){
      int counter=0;
      if(grid[i][j]==false) continue;
      int r=i; int l=j;
      while(r>0){ 
        r--;
        if(grid[r][l]==false) break;
        counter++;
      }
       int r=i; int l=j;
      while(r<H-1){
        r++;
        if(grid[r][l]==false) break;
        counter++;
      } 
        int r=i; int l=j;
      while(l>-1){ 
        l--;
        if(grid[r][l]==false) break;
        counter++;
      } 
       while(l<W-1){ 
        l++;
        if(grid[r][l]==false) break;
        counter++;
      } 
      res=max(res,counter);
    }
   }
  cout<<res<<endl;
}
       
      

Compiler output:
a.cc: In function 'int main()':
a.cc:17:14: error: expected ';' before 'if'
   17 |        cin>>a
      |              ^
      |              ;
   18 |   if(a=='.') grid[i][j]=true;
      |   ~~          
a.cc:19:7: error: 'else' without a previous 'if'
   19 |       else grid[i][j]=false;
      |       ^~~~
a.cc:33:12: error: redeclaration of 'int r'
   33 |        int r=i; int l=j;
      |            ^
a.cc:27:11: note: 'int r' previously declared here
   27 |       int r=i; int l=j;
      |           ^
a.cc:33:21: error: redeclaration of 'int l'
   33 |        int r=i; int l=j;
      |                     ^
a.cc:27:20: note: 'int l' previously declared here
   27 |       int r=i; int l=j;
      |                    ^
a.cc:39:13: error: redeclaration of 'int r'
   39 |         int r=i; int l=j;
      |             ^
a.cc:27:11: note: 'int r' previously declared here
   27 |       int r=i; int l=j;
      |           ^
a.cc:39:22: error: redeclaration of 'int l'
   39 |         int r=i; int l=j;
      |                      ^
a.cc:27:20: note: 'int l' previously declared here
   27 |       int r=i; int l=j;
      |                    ^
a.cc:50:14: error: no matching function for call to 'max(long long int&, int&)'
   50 |       res=max(res,counter);
      |           ~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:50:14: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   50 |       res=max(res,counter);
      |           ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:50:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   50 |       res=max(res,counter);
      |           ~~~^~~~~~~~~~~~~