Language: C++

#include <bits/stdc++.h>
using namespace std;
int n,m,k,x1,x2,y1,y2;
vector < vector <int> > a;
vector <int> v;
queue < pair <int,int> > q;
int di[]={0,0,1,-1};
int dj[]={1,-1,0,0};
void lee()
{ a[x1][y1]=1;
  q.push(make_pair(x1,y1));
  while(!q.empty())
  { int x=q.front().first;
    int y=q.front().second;
    q.pop();
    if(x==x2 && y==y2)
       return;
    for(int d=0;d<4;d++)
    { int i=x,j=y;
      for(int t=1;t<=k;t++)
      { i+=di[d];
        j+=dj[d];
        if(a[i][j]!=0 || i<1 || j<1 || i>n || j>m)
           break;
        a[i][j]=a[x][y]+1;
        q.push(make_pair(i,j));
      }
    }
  }
}
int main()
{ cin.tie(0);
  ios_base::sync_with_stdio(0);
  cin>>n>>m>>k;
  cin>>x1>>y1>>x2>>y2;
  for(int i=0;i<=m+1;i++)
    v.push_back(0);
  for(int i=0;i<=n+1;i++)
    a.push_back(v);
  for(int i=1;i<=n;i++)
  { for(int j=1;j<=m;j++)
    { char c;
      cin>>c;
      if(c=='@')
         a[i][j]=-1;
    }
  }
  lee();
  cout<<a[x2][y2]-1<<'\n';
  return 0;
}


Compiler output:
a.cc:3:17: error: 'int y1' redeclared as different kind of entity
    3 | 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 'void lee()':
a.cc:10:9: error: invalid conversion from 'double (*)(double) noexcept' to 'std::vector<int>::size_type' {aka 'long unsigned int'} [-fpermissive]
   10 | { a[x1][y1]=1;
      |         ^~
      |         |
      |         double (*)(double) noexcept
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:1128:28: note:   initializing argument 1 of 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](size_type) [with _Tp = int; _Alloc = std::allocator<int>; reference = int&; size_type = long unsigned int]'
 1128 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
a.cc:11:9: error: no matching function for call to 'std::queue<std::pair<int, int> >::push(std::pair<int, double (*)(double) noexcept>)'
   11 |   q.push(make_pair(x1,y1));
      |   ~~~~~~^~~~~~~~~~~~~~~~~~
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 = std::pair<int, int>; _Sequence = std::deque<std::pair<int, int>, std::allocator<std::pair<int, int> > >; value_type = std::pair<int, int>]'
  283 |       push(const value_type& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_queue.h:283:30: note:   no known conversion for argument 1 from 'std::pair<int, double (*)(double) noexcept>' to 'const std::queue<std::pair<int, int> >::value_type&' {aka 'const std::pair<int, int>&'}
  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 = std::pair<int, int>; _Sequence = std::deque<std::pair<int, int>, std::allocator<std::pair<int, int> > >; value_type = std::pair<int, int>]'
  288 |       push(value_type&& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_queue.h:288:25: note:   no known conversion for argument 1 from 'std::pair<int, double (*)(double) noexcept>' to 'std::queue<std::pair<int, int> >::value_type&&' {aka 'std::pair<int, int>&&'}
  288 |       push(value_type&& __x)
      |            ~~~~~~~~~~~~~^~~
a.cc: In function 'int main()':
a.cc:35:10: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   35 |   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:35:12: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   35 |   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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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:35:12: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   35 |   cin>>x1>>y1>>x2>>y2;
      |            ^~
      |            |
      |            double (*)(double) noexcept
a.cc:35:12: 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_t