Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX=1e6+5;
const int inf=1e7;

int dx[]={1, -1, 0, 0};
int dy[]={0, 0, 1, -1};

int h, w, l;
int x1, y1, x2, y2;
vector< string > str;
vector< vector<double> > dis[5];

struct info{
     int x, y, dir;
     double d;
     bool operator<(const info& s) const{
          return d>s.d;
     }
};

bool valid(int x, int y){ return x>=0 && x<h && y>=0 && y<w; }

int dijkstra(){
     int i, j, k;
     priority_queue< info > pq;
     for(i=0; i<4; ++i) dis[i][x1][y1]=0;
     info s;
     s.x=x1, s.y=y1, s.dir=0, s.d=0;
     pq.push(s);
     while(!pq.empty()){
          s=pq.top(); pq.pop();
          if(s.x==x2 && s.y==y2) return ceil(s.d);
          for(i=0; i<4; ++i){
               int tx=s.x+dx[i], ty=s.y+dy[i];
               double cur_dis=1.0/double(l)+(s.dir==i?s.d:ceil(s.d));
               if(valid(tx, ty) && str[tx][ty]!='@' && dis[i][tx][ty]>cur_dis){
                    dis[i][tx][ty]=cur_dis;
                    info ts;
                    ts.x=tx, ts.y=ty, ts.d=cur_dis, ts.dir=i;
                    pq.push(ts);
               }
          }
     }
     return -1;
}

int main(){
     int i, j, k;
     cin >> h >> w >> l;
     cin >> x1 >> y1 >> x2 >> y2;
     x1--, y1--, x2--, y2--;
     str.resize(h);
     for(i=0; i<4; ++i) dis[i].resize(h, vector<double>(w, inf));
     for(i=0; i<h; ++i) cin >> str[i];
     cout << dijkstra() << endl;
}


Compiler output:
a.cc:11:9: error: 'int y1' redeclared as different kind of entity
   11 | int 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 dijkstra()':
a.cc:28:36: error: invalid conversion from 'double (*)(double) noexcept' to 'std::vector<double>::size_type' {aka 'long unsigned int'} [-fpermissive]
   28 |      for(i=0; i<4; ++i) dis[i][x1][y1]=0;
      |                                    ^~
      |                                    |
      |                                    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 = double; _Alloc = std::allocator<double>; reference = double&; size_type = long unsigned int]'
 1128 |       operator[](size_type __n) _GLIBCXX_NOEXCEPT
      |                  ~~~~~~~~~~^~~
a.cc:30:18: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   30 |      s.x=x1, s.y=y1, s.dir=0, s.d=0;
      |                  ^~
      |                  |
      |                  double (*)(double) noexcept
a.cc: In function 'int main()':
a.cc:52:16: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   52 |      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:52:19: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   52 |      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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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:52:19: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   52 |      cin >> x1 >> y1 >> x2 >> y2;
      |                   ^~
      |                   |
      |                   double (*)(double) noexcept
a.cc:52:19: 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>]'