Language: C++

#include <bits/stdc++.h>
#define Dim 1000003
using namespace std;
ifstream f("A.in");
typedef long long ll;
const ll inf=0xfffffffff;
ll N,M,K,x1,x2,y1,y2,ans=LONG_MAX;
int dx[]={0,1,-1,0,0};
int dy[]={0,0,0,1,-1};
char c;
bool stop=1;
vector < vector < ll > > A;
vector < vector < ll > > viz;
vector < vector < ll > > dp;

void BFS(ll x,ll y,int dir,int deps)
{
 //cout<<xp<<' '<<yp<<' '<<dp[xp][yp]<<' '<<desp<<' '<<x<<' '<<y<<' '<<dir<<' '<<deps<<' '<<dp[x][y]<<'\n';
    viz[x][y]=1;

    for(int i=1;i<=4;i++)
    {
        ll xn=x+dx[i];
        ll yn=y+dy[i];

        if(xn>=1&&yn>=1&&yn<=M&&xn<=N && A[xn][yn]==0)
        {//if(xn==3&&yn==1 ) cout<<dp[x][y]<<' '<<x<<' '<<y<<' '<<dir<<' '<<deps<<'\n';
            if( dir==i )
            {
                ll d1=1,go=1;
                if(deps+1<=K) d1=0,go=deps+1;

                if(viz[xn][yn]==0)
                {
                    dp[xn][yn]=dp[x][y]+d1;
                    BFS(xn,yn,i,go);
                }
                else
                if(dp[x][y]+d1<dp[xn][yn])
                {
                    dp[xn][yn]=dp[x][y]+d1;
                    BFS(xn,yn,i,go);
                }
            }
            else
            {//if(xn==3&&yn==1) cout<<dp[xn][yn]<<' '<<x<<' '<<y<<' '<<dp[x][y]<<' '<<i<<'\n';

                int go=1;
                //if(dir==-1) go=1;
                if(viz[xn][yn]==0)
                {
                    dp[xn][yn]=dp[x][y]+1;
                    BFS(xn,yn,i,go);
                }
                else
                {//cout<<"hghg "<<x<<' '<<y<<' '<<xn<<' '<<yn<<' '<<dp[x][y]<<' '<<dp[xn][yn]<<'\n';
                    if(dp[x][y]+1<=dp[xn][yn])
                {

                    dp[xn][yn]=dp[x][y]+1;
                    BFS(xn,yn,i,go);
                }

                }
            }
        }
    }
}

int main()
{
   cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
   A.resize(N+1,vector < ll > (M+1) );
   viz.resize(N+1,vector < ll > (M+1,0) );
   dp.resize(N+1,vector < ll > (M+1,inf) );
   for(int i=1;i<=N;i++,cin.get())
   for(int j=1;j<=M;j++)
   {
       cin>>c;
       if(c=='.') A[i][j]=0;
       else A[i][j]=1;
   }


   dp[x1][y1]=0;
   BFS(x1,y1,-1,0);

   if(dp[x2][y2]==inf) cout<<-1;
   else
   cout<<dp[x2][y2]<<'\n';

   return 0;
}


Compiler output:
a.cc:7:16: error: 'll y1' redeclared as different kind of entity
    7 | ll N,M,K,x1,x2,y1,y2,ans=LONG_MAX;
      |                ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:72:20: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |    ~~~~~~~~~~~~~~~~^~~~
      |                |     |
      |                |     double(double) noexcept
      |                std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/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:72:22: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
/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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(short int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(short unsigned int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(unsigned int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(long int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(long unsigned int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(long long int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(long long unsigned int)y1' 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:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:72:22: error: cannot bind rvalue '(void*)y1' to 'void*&'
/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>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:72:22: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   72 |    cin>>N>>M>>K>>x1>>y1>>x2>>y2; cin.get();
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]' (near match)
  126 |       operator>>(__ios_t