Language: C++

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define endl "\n"
#define se second
#define ll long long
#define inf 0x3f3f3f3f
#define fast    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
const int N = 1e6+5;
const ll mod =   1e9+7;
int n,m,k,x1,y1,x2,y2;
int dx[4]={1,-1,0,0};int dy[4]={0,0,1,-1};
int main()
{  fast
cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
string s[n];
for(int i=0;i<n;i++)
cin>>s[i];
vector<vector<int> > g(n,vector<int> (m,1e9));
queue<pair<int,int> > q;
q.push({x1,y1});
g[x1][y1]=0;
while(!q.empty()){
	int x=q.front().fi;int y=q.front().se;
	q.pop();
	int val=g[x][y]+1;
	 for(int dir=0;dir<4;dir++){int xx=x;int yy=y;
	 	for(int i=1;i<=k;i++){
	 	  xx +=dx[dir]; yy+=dy[dir];
	 	if(xx<0||yy<0||xx>=n||yy>=m||s[xx][yy]=='@'||g[xx][yy]<val)
	 	break;
	 	if(g[xx][yy]>val){

	 	g[xx][yy]=val;
	 	q.push({xx,yy});}}
	 }
}
if(g[x2][y2]==1e9){
	cout<<-1;
}
else{
	cout<<g[x2][y2];
}
}

Compiler output:
a.cc:11:14: error: 'int y1' redeclared as different kind of entity
   11 | 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:15:17: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;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:15:19: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;x1--;y1--;x2--;y2--;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:15:19: 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:15:19: 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]
   15 | cin>>n>>m>>k>>x1>>y1>>x2>>y2;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&))
      |       ^~~~