Language: C++

#include <bits/stdc++.h>
#define int long long
#pragma GCC optimize("O3,Ofast,no-stack-protector,unroll-loops,fast-math")
using namespace std;

int H, W, K, x1, y1, x2, y2;
vector<vector<char>> kek;
vector<vector<int>> dp;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
    kek.resize(H + 1);
    dp.resize(H + 1);
    for (int i = 1; i <= H; i++) {
        kek[i].resize(W + 1);
        dp[i].resize(W + 1, -1);
        for (int j = 1; j <= W; j++) {
            cin >> kek[i][j];
        }
    }
    queue<pair<int, int>> qp;
    qp.push({x1, y1});
    dp[x1][y1] = 0;
    while (!qp.empty()) {
        pair<int, int> pr = qp.front();
        qp.pop();
        int x = pr.first;
        int y = pr.second;
        for (int i = x + 1; i <= min(H, x + K); i++) {
            if (kek[i][y] == '@') break;
            if (dp[i][y] != -1) continue;
            dp[i][y] = dp[x][y] + 1;
            qp.push({i, y});
        }
        for (int i = x - 1; i >= max(1LL, x - K); i--) {
            if (kek[i][y] == '@') break;
            if (dp[i][y] != -1) continue;
            dp[i][y] = dp[x][y] + 1;
            qp.push({i, y});
        }
        for (int i = y + 1; i <= min(W, y + K); i++) {
            if (kek[x][i] == '@') break;
            if (dp[x][i] != -1) continue;
            dp[x][i] = dp[x][y] + 1;
            qp.push({x, i});
        }
        for (int i = y - 1; i >= max(1LL, y - K); i--) {
            if (kek[x][i] == '@') break;
            if (dp[x][i] != -1) continue;
            dp[x][i] = dp[x][y] + 1;
            qp.push({x, i});
        }
    }
    cout << dp[x2][y2] << '\n';

    fflush(stdout);
    return 0;
}


Compiler output:
a.cc:6:18: error: 'long long int y1' redeclared as different kind of entity
    6 | int H, W, 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:15:30: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   15 |     cin >> H >> W >> 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:15:33: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   15 |     cin >> H >> W >> 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |                                 |
      |                                 double (*)(double) noexcept
a.cc:15:33: 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:15:33: 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]
   15 |     cin >> H >> W >> K >> x1 >> y1 >> x2 >> y2;
      |                                 ^~
      |