Language: C++

#include<bits/stdc++.h>
using namespace std;
const int dx[4]={-1,1,0,0},dy[4]={0,0,-1,1};
int n,m,k,x1,x2,y1,y2;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m>>k>>x1>>y1>>x2>>y2;
	x1--;
	y1--;
	x2--;
	y2--;
	cout<<x1<<" "<<y1<<" "<<x2<<" "<<y2<<endl;
	char grid[n+10][m+10];
	int dist[n+10][m+10];
	for(int i=0;i<n;i++)
		for(int j=0;j<m;j++)
			cin>>grid[i][j];
	queue<pair<int,int> >q;
	q.push(make_pair(x1,y1));
	memset(dist,0x3f,sizeof(dist));
	dist[x1][y1]=0;
	while(!q.empty())
	{
		int nx=q.front().first;
		int ny=q.front().second;
		q.pop();
		for(int i=0;i<4;i++)
		{
			for(int j=1;j<=k;j++)
			{
				int tx=nx+dx[i]*j;
				int ty=ny+dy[i]*j;
				if(tx>=0&&tx<n&&ty>=0&&ty<m)
				{
					if(grid[tx][ty]=='@')
						break;
					if(dist[tx][ty]>1e7)
					{
						dist[tx][ty]=dist[nx][ny]+1;
						q.push(make_pair(tx,ty));
					}
				}
				else
					break;
			}
		}
	}
	if(dist[x2][y2]>1e7)
		cout<<-1<<endl;
	else
		cout<<dist[x2][y2]<<endl;
	return 0;
}

Compiler output:
a.cc:4:17: error: 'int y1' redeclared as different kind of entity
    4 | int n,m,k,x1,x2,y1,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:10:25: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   10 |         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:10:27: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   10 |         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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   10 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:10:27: 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:10:27: 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]
   10 |         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_ist