Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;

int main(){
  int h,w;
  cin >> h >> w;
  vector<string> s(w);
  rep(i,h) cin >> s[i];
  vecotr<vector<int>> cnt(h,vector<int>(w));
  
  rep(i,h){
    vector<int> done(w);
    rep(j,w){
      if(s[i][j]=='#')continue;
      if(done[j])continue;
      
      int l = 0;
      
      while(j+l<w){
        if(s[i][j+l])break;
        l++;
      }
      
      rep(k,l){
        cnt[i][j+k] +=l;
        done[j+k] = 1;
      }
    }
  }
  
  rep(i,w){
    vector<int> done(h);
    rep(j,h){
      if(s[i][j]=='#')continue;
      if(done[j])continue;
      
      int l = 0;
      
      while(j+l<h){
        if(s[i][j+l])break;
        l++;
      }
      
      rep(k,l){
        cnt[i][j+k] +=l;
        done[j+k] = 1;
      }
    }
  }

  int ans = 0;
  rep(i,w){
    rep(j,h){
      ans = max(ans,s[h][w]);
    }
  }
  cout << ans << endl;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 'vecotr' was not declared in this scope
   10 |   vecotr<vector<int>> cnt(h,vector<int>(w));
      |   ^~~~~~
a.cc:10:20: error: expected primary-expression before '>' token
   10 |   vecotr<vector<int>> cnt(h,vector<int>(w));
      |                    ^~
a.cc:10:23: error: 'cnt' was not declared in this scope; did you mean 'int'?
   10 |   vecotr<vector<int>> cnt(h,vector<int>(w));
      |                       ^~~
      |                       int
a.cc:55:16: error: no matching function for call to 'max(int&, __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type&)'
   55 |       ans = max(ans,s[h][w]);
      |             ~~~^~~~~~~~~~~~~
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:55:16: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'})
   55 |       ans = max(ans,s[h][w]);
      |             ~~~^~~~~~~~~~~~~
/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:55:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   55 |       ans = max(ans,s[h][w]);
      |             ~~~^~~~~~~~~~~~~