Language: C++

#include <bits/stdc++.h>

#define pb push_back
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ii pair<int,int>
#define vi vector<int>
#define vll vector<ll>
#define vii vector<ii>

using namespace std;

const int INF = 1e9+10;

int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};
char ha[] = {'b','c','d','e'};

int h,w,k,x1,y1,x2,y2;
char g[1123][1123];
int dist[1123][1123];


bool ok(int x,int y){
	return x>=1&&x<=h&&y>=1&&y<=w&&g[x][y]=='.';
}

void dfs(int x,int y,int m,int d,char dir,int lx=-1,int ly=-1){
	if(dist[x][y] < d) return;
	dist[x][y] = d;
	//cout<<"m="<<m<<" x="<<x<<" y="<<y<<" d="<<d<<" lx="<<lx<<" ly="<<ly<<endl;
	for(int i=0;i<4;++i){
		int n_x = x+dx[i], n_y = y+dy[i];
		char n_dir = ha[i];
		if(ok(n_x,n_y)){
			if(m==1 || dir != n_dir){
				dfs(n_x,n_y,k,d+1,n_dir,x,y);
			}
			else if(dir==n_dir && m>1){
				dfs(n_x,n_y,m-1,d,n_dir,x,y);
			}
		}
	}
}

int32_t main(){
	ios_base::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){
			dist[i][j]=INF;
			cin>>g[i][j];
		}
	}
	if(x1==x2 && y1==y2){
		cout<<0<<endl;
		exit(0);
	}
	dfs(x1,y1,k,0,'#');
	//cout<<dist[x2][y2]<<endl;
	cout<<(dist[x2][y2]==INF ? -1 : dist[x2][y2])<<endl;
	return 0;
}

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 'int32_t main()':
a.cc:52:25: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   52 |         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:52:27: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   52 |         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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   52 |         cin>>h>>w>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:52:27: 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:52:27: 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]
   52 |         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_i