Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,pii> piiii; 
const int INF=1e9;
#define fi first
#define se second
#define mkp make_pair
const int dir[4][2]={{0,1},{1,0},{-1,0},{0,-1}};
int n,m,K,x1,x2,y1,y2;
pii rev[1000004]; 
int getID(int x,int y){
	return (x-1)*m+y;
}
pii d[1000004][4];
bool ok[1000004],vis[1000004][4];
priority_queue<piiii,vector<piiii>,greater<piiii> >pq;
char c[1000004];
void add(int A,int B,int C,int D,int E,int F){
//	cout<<A<<" "<<B<<" "<<C<<" "<<D<<" "<<E<<" "<<F<<d[A][B].fi<<" "<<d[C][D].fi<<"\n"; 
	if(d[A][B].fi+E<d[C][D].fi || (d[A][B].fi+E==d[C][D].fi&&F<d[C][D].se)){
		d[C][D]=mkp(d[A][B].fi+E,F);
		pq.push(mkp(d[C][D],mkp(C,D)));
	}
}
int main(){
	cin>>n>>m>>K>>x1>>y1>>x2>>y2;
	for(int i=1;i<=n;i++){
		scanf("%s",c+1);
		for (int j=1;j<=m;j++)
			rev[getID(i,j)]=mkp(i,j),ok[getID(i,j)]=(c[j]=='.'?1:0);
	}
	for(int i=1;i<=n*m;i++)for(int j=0;j<4;j++)d[i][j]=mkp(INF,0);
	for(int i=0;i<4;i++){
		d[getID(x1,y1)][i]=mkp(1,-K);
		pq.push(mkp(d[getID(x1,y1)][i],mkp(getID(x1,y1),i)));
	}
	while(!pq.empty()){
		piiii u=pq.top();pq.pop();
		pii pos=u.se,val=u.fi;
		if(vis[pos.fi][pos.se])continue;vis[pos.fi][pos.se]=1;
//		cout<<u.fi.fi<<" "<<u.fi.se<<" "<<u.se.fi<<" "<<u.se.se<<"\n";
		for(int i=0;i<4;i++){
			if(pos.se!=i){
				add(pos.fi,pos.se,pos.fi,i,1,-K);
			//	cout<<i<<"\n";
			}else{
				int add1,add2;
				if(val.se==0)add1=1,add2=-K;
				else add1=0,add2=val.se+1;
				pii path=mkp(dir[i][0]+rev[pos.fi].fi,dir[i][1]+rev[pos.fi].se);
				if(path.fi<1 || path.se<1 || path.fi>n || path.se>m || !ok[getID(path.fi,path.se)])continue;
				add(pos.fi,pos.se,getID(path.fi,path.se),i,add1,add2);
			}
		}
	}
	int ans=1e9;
	for(int i=0;i<4;i++)ans=min(d[getID(x2,y2)][i].fi,ans);
	if(ans<1e9)cout<<ans;
	else cout<<"-1";
}

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