Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
const int maxn =1e6+10;
#define pb push_back

int ans=-1;
int h,w,k;
string s[maxn];
int x1,x2,y1,y2;

int xx[5]={58,1,-1,0,0};
int yy[5]={58,0,0,-1,1};
map<int,map<int,int>>vis;
struct ac
{
    int x,y,step;
};


void bfs()
{
    queue<ac>q;
    q.push({x1,y1,0});
    vis[x1][y1]=1;
    while(!q.empty())
    {
        ac u=q.front();
        q.pop();
        if(u.x==x2&&u.y==y2)
        {
            ans=u.step;
            return;
        }
        for(int i=1;i<=4;i++)
        {
            int f=0;
            for(int j=1;j<=k;j++)
            {
                int tx=xx[i]*j+u.x;
                int ty=yy[i]*j+u.y;
                if(f)
                    continue;
                if(tx<0||ty<0||tx>=h||ty>=w||vis[tx][ty])
                    continue;
                if(s[tx][ty]=='@')
                {
                    f=1;
                    continue;
                }
                vis[tx][ty]=1;
                q.push({tx,ty,u.step+1});

            }
        }
    }
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin>>h>>w>>k;
    cin>>x1>>y1>>x2>>y2;
    x1--;
    y1--;
    x2--;
    y2--;
    for(int i=0;i<h;i++)
    {
        cin>>s[i];
    }
    bfs();
    cout<<ans<<'\n';










}


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 'void bfs()':
a.cc:25:11: error: no matching function for call to 'std::queue<ac>::push(<brace-enclosed initializer list>)'
   25 |     q.push({x1,y1,0});
      |     ~~~~~~^~~~~~~~~~~
In file included from /usr/include/c++/14/queue:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:157:
/usr/include/c++/14/bits/stl_queue.h:283:7: note: candidate: 'void std::queue<_Tp, _Sequence>::push(const value_type&) [with _Tp = ac; _Sequence = std::deque<ac, std::allocator<ac> >; value_type = ac]'
  283 |       push(const value_type& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_queue.h:283:30: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const std::queue<ac>::value_type&' {aka 'const ac&'}
  283 |       push(const value_type& __x)
      |            ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_queue.h:288:7: note: candidate: 'void std::queue<_Tp, _Sequence>::push(value_type&&) [with _Tp = ac; _Sequence = std::deque<ac, std::allocator<ac> >; value_type = ac]'
  288 |       push(value_type&& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_queue.h:288:25: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::queue<ac>::value_type&&' {aka 'ac&&'}
  288 |       push(value_type&& __x)
      |            ~~~~~~~~~~~~~^~~
a.cc:26:12: error: ambiguous overload for 'operator[]' (operand types are 'std::map<int, std::map<int, int> >::mapped_type' {aka 'std::map<int, int>'} and 'double(double) noexcept')
   26 |     vis[x1][y1]=1;
      |            ^
In file included from /usr/include/c++/14/map:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152:
/usr/include/c++/14/bits/stl_map.h:504:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; mapped_type = int; key_type = int]' (near match)
  504 |       operator[](const key_type& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:504:7: note:   conversion of argument 1 would be ill-formed:
a.cc:26:13: error: invalid conversion from 'double (*)(double) noexcept' to 'std::map<int, int>::key_type' {aka 'int'} [-fpermissive]
   26 |     vis[x1][y1]=1;
      |             ^~
      |             |
      |             double (*)(double) noexcept
/usr/include/c++/14/bits/stl_map.h:524:7: note: candidate: 'std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](key_type&&) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int> >; mapped_type = int; key_type = int]' (near match)
  524 |       operator[](key_type&& __k)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:524:7: note:   conversion of argument 1 would be ill-formed:
a.cc:26:13: error: invalid conversion from 'double (*)(double) noexcept' to 'std::map<int, int>::key_type' {aka 'int'} [-fpermissive]
   26 |     vis[x1][y1]=1;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc: In function 'int main()':
a.cc:65:12: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   65 |     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:65:14: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   65 |     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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: 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:65:14: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   65 |     cin>>x1>>y1>>x2>>y2;
      |              ^~
      |              |
      |              double (*)(double) noexcept
a.cc:65:14: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/istream:203