Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
const int mod = 1e9+7;
const int mx = INT_MAX;
const long double pi = 4*atan((long double)1);
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vii;
#define file "orz"
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};
int h,w,k,x1,y1,x2,y2;
char mat[1005][1005];
int dist[1005][1005];
signed main()
{
    //freopen(file".inp","r",stdin);
    //freopen(file".out","w",stdout);
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin>>h>>w>>k>>x1>>y1>>x2>>y2;
	for(int i=1;i<=h;i++)
	{
		for(int j=1;j<=w;j++)
		{
			cin>>mat[i][j];
			dist[i][j]=mx;
		}
	}		
//		for(int i=1;i<=h;i++)
//		for(int j=1;j<=w;j++)
//			cout<<dist[i][j]<<" ";
	queue<pii> q;
	dist[x1][y1] = 0;
	q.push(mp(x1,y1));
	while(!q.empty())
	{
		
		int xx = q.front().fi;
		int yy = q.front().se;
//		cout<<xx<<" "<<yy<<endl;
		q.pop();
		for(int i=0;i<4;i++)
		{
			for(int j=1;j<=k;j++)
			{
//				cout<<"here";
				int xxx = xx + dx[i]*j;
				int yyy = yy + dy[i]*j;
//				cout<<xxx<<" "<<yyy<<endl;
				if(xxx<1 || h<xxx || yyy<1 || w<yyy || mat[xxx][yyy] != '.' || dist[xxx][yyy] <= dist[xx][yy]) 
					break;
                if(dist[xxx][yyy]>dist[xx][yy]+1) 
				{	
					dist[xxx][yyy] = dist[xx][yy]+1;
					q.push(mp(xxx,yyy));
				}
			}
		}
	}
	if(dist[x2][y2]>=mx)
		return cout<<-1,0;
//	for(int i=1;i<=h;i++)
//		for(int j=1;j<=w;j++)
//			cout<<dist[i][j]<<" ";
	cout<<dist[x2][y2];
}


Compiler output:
a.cc:21:14: error: 'int y1' redeclared as different kind of entity
   21 | int h,w,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:29:21: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   29 |     cin>>h>>w>>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:29:23: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   29 |     cin>>h>>w>>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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   29 |     cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                       ^~
      |                       |
      |                       double (*)(double) noexcept
a.cc:29:23: 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:29:23: 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]
   29 |     cin>>h>>w>>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