Language: C++

#include<bits/stdc++.h>
#define FIO ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;
typedef long long ll;

#define row second.first
#define col second.second
#define cost first

int const N=2e5+5, M=1e3+5, MOD=1e9+7, OO=0x3f3f3f3f;

int n,m,k,x1,y1,x2,y2;
vector<vector<int>>dis;
string grid[N];

int dr[]={0,0,1,-1};
int dc[]={1,-1,0,0};

bool valid(int r, int c)
{
    return r>=0 && r<n && c>=0 && c<m && grid[r][c]=='.';
}

void dijkstra(int sr, int sc)
{
    int ur,uc,vr,vc,c;
    priority_queue<pair<int,pair<int,int>>,vector<pair<int,pair<int,int>>>,greater<pair<int,pair<int,int>>>>q;
    dis[sr][sc]=0;
    q.push({0,{sr,sc}});
    while(!q.empty())
    {
        ur=q.top().row;
        uc=q.top().col;
        c=q.top().cost;
        q.pop();
        if(ur==x2-1 && uc==y2-1)
            return;
        if(dis[ur][uc]!=c)
            continue;
        for(int i=0; i<4; i++)
        {
            for(int j=1; j<=k; j++)
            {
                vr=ur+(j*dr[i]);
                vc=uc+(j*dc[i]);
                if(valid(vr,vc))
                {
                    if(dis[vr][vc]>dis[ur][uc]+1)
                    {
                        dis[vr][vc]=dis[ur][uc]+1;
                        q.push({dis[vr][vc],{vr,vc}});
                    }
                }
                else
                    break;

            }
        }
    }
}



int main()
{
    FIO
//    freopen("input.txt","rt",stdin);
//    freopen("output.txt","wt",stdout);
    cin>>n>>m>>k>>x1>>y1>>x2>>y2;
    for(int i=0; i<n; i++)
        cin>>grid[i];
    dis=vector<vector<int>>(n+1,vector<int>(m+1,OO));
    dijkstra(x1-1,y1-1);
    if(dis[x2-1][y2-1]==OO)
        cout<<"-1\n";
    else
        cout<<dis[x2-1][y2-1]<<"\n";

}


Compiler output:
a.cc:12:14: error: 'int y1' redeclared as different kind of entity
   12 | int n,m,k,x1,y1,x2,y2;
      |              ^~
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:69:21: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |     ~~~~~~~~~~~~~~~~^~~~
      |                 |     |
      |                 |     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:69:23: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
/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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:69:23: 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:69:23: 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]
   69 |     cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       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_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:7: note:   conv