Language: C++

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

int main(){
  int N,A,B,C,D;
  cin >> N >> A >> B >> C >> D;
  vector<string> path(N);
  for(int i=0;i<N;i++){
    cin >> path.at(i);
  }
  vector<vector<bool>> dp(N,vector<bool>(N,false)); // a,b
  dp[A][B] = true;
  for(int a=0;a<N-1;a++){
    for(int b=0;b<N-1;b++){
      dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      dp[a][b+1] = (dp[a][b] || dp[a][b-1]) && (path[b+1]='.' && a != b+1)) || dp[a][b+1];
    }
  }
  cout << dp[C][D] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:45: error: no match for 'operator&&' (operand types are 'bool' and 'std::__cxx11::basic_string<char>')
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                              |                           |
      |                              bool                        std::__cxx11::basic_string<char>
a.cc:15:45: note: candidate: 'operator&&(bool, bool)' (built-in)
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:15:45: note:   no known conversion for argument 2 from 'std::__cxx11::basic_string<char>' to 'bool'
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166,
                 from a.cc:1:
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   mismatched types 'const std::valarray<_Tp>' and 'bool'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   mismatched types 'const std::valarray<_Tp>' and 'bool'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:15:74: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::valarray<_Tp>'
   15 |       dp[a+1][b] = (dp[a][b] || dp[a-1][b]) && (path[a+1]='.' && b != a+1)) || dp[a+1][b];
      |                                                                          ^
a.cc:16:45: error: no match for 'operator&&' (operand types are 'bool' and 'std::__cxx11::basic_string<char>')
   16 |       dp[a][b+1] = (dp[a][b] || dp[a][b-1]) && (path[b+1]='.' && a != b+1)) || dp[a][b+1];
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                              |                           |
      |                              bool                        std::__cxx11::basic_string<char>
a.cc:16:45: note: candidate: 'operator&&(bool, bool)' (built-in)
   16 |       dp[a][b+1] = (dp[a][b] || dp[a][b-1]) && (path[b+1]='.' && a != b+1)) || dp[a][b+1];
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:16:45: note:   no known conversion for argument 2 from 'std::__cxx11::basic_string<char>' to 'bool'
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:16:74: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   16 |       dp[a][b+1] = (dp[a][b] || dp[a][b-1]) && (path[b+1]='.' && a != b+1)) || dp[a][b+1];
      |                                                                          ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:16:74: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   16 |       dp[a][b+1] = (dp[a][b] || d