Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<int, int> i_i;

#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define ALL(v) v.begin(), v.end()
#define SZ(x) ((ll)(x).size())

const double PI  = acos(-1.0);
//const ll INF = 1e18+3;
const ll mod = 998244353;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
#define print(x) cerr << #x << " is " << x << endl;

//#include<iostream>
//#include<queue>
//using namespace std;
const int dir[4][2]={{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
const int INF=1e9;
int n,m,k,x1,y1,x2,y2;
int main() {
	cin>>n>>m>>k>>x1>>y1>>x2>>y2;
	x1--;
	x2--;
	y1--;
	y2--;
	char mp[n][m]={};
	int dis[n][m]={};
	int i,j,ans=0;
    for(i=0;i<n;i++)
        for(j=0;j<m;j++)
            cin>>mp[i][j],dis[i][j]=INF;
    queue<pair<int,int> >que;
    dis[x1][y1]=0;
    que.push(make_pair(x1,y1));
    while (!que.empty())
	{
        int x=que.front().first;
        int y=que.front().second;
        que.pop();
        for(i=0;i<4;i++)
		{
            int nx=x, ny=y;
            int nd=dis[x][y]+1;
            for(j=1; j<=k; j++)
			{
                nx+=dir[i][0];
                ny+=dir[i][1];
                if (nx<0||ny<0||nx>=n||ny>=m||mp[nx][ny]=='@'||dis[nx][ny]<nd)
                    break;
                if(dis[nx][ny]>nd)
				{
                    dis[nx][ny]=nd;
                    que.push(make_pair(nx, ny));
                }
            }
        }
    }
    ans=dis[x2][y2];
    cout<<(ans == INF ? -1 : ans);
    return 0;
}



Compiler output:
a.cc:24:14: error: 'int y1' redeclared as different kind of entity
   24 | 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:26:25: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   26 |         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:26:27: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   26 |         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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   26 |         cin>>n>>m>>k>>x1>>y1>>x2>>y2;
      |                           ^~
      |                           |
      |                           double (*)(double) noexcept
a.cc:26:27: 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:26:27: 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]
   26 |         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_istre