Language: C++

#include<bits/stdc++.h>
#define ll long long
#define ss second
#define ff first
#define pb push_back
using namespace std;

const int N = 1e6 + 6;

int n,m,k;
int x1,x2,y1,y2;

int X[4] = {0,0,1,-1};
int Y[4] = {1,-1,0,0};

int main(){

        cin >> n >> m >> k;
        cin >> x1 >> y1 >> x2 >> y2;

        char A[n+1][m+1]; int D[n+1][m+1];
        for(int i = 1; i <= n; i++){
                for(int j = 1; j <= m; j++){
                        D[i][j] = 1e9;
                        cin >> A[i][j];
                }
        }

        queue<pair<int,int>>q;
        q.push({x1,y1});
        D[x1][y1] = 0;

        while(q.size()){

                auto p = q.front();
                q.pop();
                int x = p.ff;
                int y = p.ss;
                //cout << x << " " << y << endl;
                for(int j = 0; j < 4; j++){
                        for(int i = 1; i <= k; i++){
                                int nx = x + X[j]*i;
                                int ny = y + Y[j]*i;
                                if((A[nx][ny] == '@') || nx < 1 || nx > n || ny < 1 || ny > m) break;
                                if(D[nx][ny] <= D[x][y]+1) break;
                                D[nx][ny] = D[x][y]+1;
                                q.push({nx,ny});
                        }
                }
        }

        if(D[x2][y2] == 1e9) D[x2][y2] = -1;

        cout << D[x2][y2] << endl;

}


Compiler output:
a.cc:11:11: error: 'int y1' redeclared as different kind of entity
   11 | int 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:19:19: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   19 |         cin >> 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:19:22: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   19 |         cin >> 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   19 |         cin >> x1 >> y1 >> x2 >> y2;
      |                      ^~
      |                      |
      |                      double (*)(double) noexcept
a.cc:19:22: 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:19:22: 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]
   19 |         cin >> 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:   conversion of a