Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#define rep(i, n) for(int i = 0; i < n; i++)
using namespace std;
typedef long long ll;

int main() {
    const int INF = 100000;
    int h, w;
    cin >> h >> w;
    string s[w];
    rep(i, h) {
        cin >> s;
    }
    int L[h][w], R[h][w], U[h][w], D[h][w], sum[h][w];
    int ans = INF;

    rep(i, h) {
        rep(j, w) {
            if(s[i][j] == '#') {
                L[i][j] = 0;
            }
            else if(j == 0) {
                L[i][j] = 1;
            }
            else {
                L[i][j+1] = L[i][j] + 1;
            }
        }
    }

    rep(i, h) {
        for(int j = w-1; j >= 0; j--) {
            if(s[i][j] == '#') {
                R[i][j] = 0;
            }
            else if(j == w-1) {
                R[i][j] = 1;
            }
            else {
                R[i][j] = R[i][j+1] + 1;
            }
        }
    }

    rep(i, h) {
        rep(j, w) {
            if(s[i][j] == '#') {
                U[i][j] = 0;
            }
            else if(i == 0) {
                U[i][j] = 1;
            }
            else {
                U[i+1][j] = U[i][j] + 1;
            }
        }
    }

    for(int i = h-1; h >= 0; h--) {
        rep(j, w) {
            if(s[i][j] == '#') {
                D[i][j] = 0;
            }
            else if(i == h-1) {
                D[i][j] = 1;
            }
            else {
                D[i][j] = D[i+1][j] + 1;
            }
        }
    }

    rep(i, h) {
        rep(j, w) {
            sum[i][j] = L[i][j] + R[i][j] + U[i][j] + D[i][j] - 3;
            ans = min(ans, sum[i][j]); 
        }
    }

    cout << ans;
    
    cout << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:13: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'std::string [w]' {aka 'std::__cxx11::basic_string<char> [w]'})
   17 |         cin >> s;
      |         ~~~ ^~ ~
      |         |      |
      |         |      std::string [w] {aka std::__cxx11::basic_string<char> [w]}
      |         std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'std::string*' {aka 'std::__cxx11::basic_string<char>*'}
   17 |         cin >> s;
      |                ^
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'short int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(short int)((std::string*)(& s))' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'short unsigned int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(short unsigned int)((std::string*)(& s))' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(int)((std::string*)(& s))' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'unsigned int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(unsigned int)((std::string*)(& s))' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'long int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(long int)((std::string*)(& s))' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'long unsigned int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(long unsigned int)((std::string*)(& s))' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'long long int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(long long int)((std::string*)(& s))' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'long long unsigned int' [-fpermissive]
   17 |         cin >> s;
      |                ^
      |                |
      |                std::string* {aka std::__cxx11::basic_string<char>*}
a.cc:17:16: error: cannot bind rvalue '(long long unsigned int)((std::string*)(& s))' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:17:16: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   17 |         cin >> s;
      |                ^
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'std::string [w]' {aka 'std::__cxx11::basic_string<char> [w]'} to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'std::string [w]' {aka 'std::__cxx11::basic_string<char> [w]'} to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'std::string [w]' {aka 'std::__cxx11::basic_string<char> [w]'} to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istre