Language: C++

#include <bits/stdc++.h>
int main(void){
int sx,sy,tx,ty;
cin >> sx >> sy >> tx >> ty;

const int dx=tx-sx,dy=ty-sy;

 // Path 1
cout << string(dy,’U’) << string(dx,’R’);

 // Path 2
cout << string(dy,’D’) << string(dx,’L’);

 // Path 3
 cout << ’L’ << string(dy+1,’U’) << string(dx+1,’R’) << ’D’;

 // Path 4
 cout << ’R’ << string(dy+1,’D’) << string(dx+1,’L’) << ’U’;

 // EndLine
cout << endl;
 return 0;
 }

Compiler output:
a.cc:9:19: error: extended character ’ is not valid in an identifier
    9 | cout << string(dy,’U’) << string(dx,’R’);
      |                   ^
a.cc:9:19: error: extended character ’ is not valid in an identifier
a.cc:9:37: error: extended character ’ is not valid in an identifier
    9 | cout << string(dy,’U’) << string(dx,’R’);
      |                                     ^
a.cc:9:37: error: extended character ’ is not valid in an identifier
a.cc:12:19: error: extended character ’ is not valid in an identifier
   12 | cout << string(dy,’D’) << string(dx,’L’);
      |                   ^
a.cc:12:19: error: extended character ’ is not valid in an identifier
a.cc:12:37: error: extended character ’ is not valid in an identifier
   12 | cout << string(dy,’D’) << string(dx,’L’);
      |                                     ^
a.cc:12:37: error: extended character ’ is not valid in an identifier
a.cc:15:10: error: extended character ’ is not valid in an identifier
   15 |  cout << ’L’ << string(dy+1,’U’) << string(dx+1,’R’) << ’D’;
      |          ^
a.cc:15:10: error: extended character ’ is not valid in an identifier
a.cc:15:29: error: extended character ’ is not valid in an identifier
   15 |  cout << ’L’ << string(dy+1,’U’) << string(dx+1,’R’) << ’D’;
      |                             ^
a.cc:15:29: error: extended character ’ is not valid in an identifier
a.cc:15:49: error: extended character ’ is not valid in an identifier
   15 |  cout << ’L’ << string(dy+1,’U’) << string(dx+1,’R’) << ’D’;
      |                                                 ^
a.cc:15:49: error: extended character ’ is not valid in an identifier
a.cc:15:57: error: extended character ’ is not valid in an identifier
   15 |  cout << ’L’ << string(dy+1,’U’) << string(dx+1,’R’) << ’D’;
      |                                                         ^
a.cc:15:57: error: extended character ’ is not valid in an identifier
a.cc:18:10: error: extended character ’ is not valid in an identifier
   18 |  cout << ’R’ << string(dy+1,’D’) << string(dx+1,’L’) << ’U’;
      |          ^
a.cc:18:10: error: extended character ’ is not valid in an identifier
a.cc:18:29: error: extended character ’ is not valid in an identifier
   18 |  cout << ’R’ << string(dy+1,’D’) << string(dx+1,’L’) << ’U’;
      |                             ^
a.cc:18:29: error: extended character ’ is not valid in an identifier
a.cc:18:49: error: extended character ’ is not valid in an identifier
   18 |  cout << ’R’ << string(dy+1,’D’) << string(dx+1,’L’) << ’U’;
      |                                                 ^
a.cc:18:49: error: extended character ’ is not valid in an identifier
a.cc:18:57: error: extended character ’ is not valid in an identifier
   18 |  cout << ’R’ << string(dy+1,’D’) << string(dx+1,’L’) << ’U’;
      |                                                         ^
a.cc:18:57: error: extended character ’ is not valid in an identifier
a.cc: In function 'int main()':
a.cc:4:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 | cin >> sx >> sy >> tx >> ty;
      | ^~~
      | std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 | cout << string(dy,’U’) << string(dx,’R’);
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:9:19: error: '\U00002019U\U00002019' was not declared in this scope
    9 | cout << string(dy,’U’) << string(dx,’R’);
      |                   ^~~
a.cc:9:9: error: 'string' was not declared in this scope
    9 | cout << string(dy,’U’) << string(dx,’R’);
      |         ^~~~~~
a.cc:9:9: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:9:37: error: '\U00002019R\U00002019' was not declared in this scope
    9 | cout << string(dy,’U’) << string(dx,’R’);
      |                                     ^~~
a.cc:12:19: error: '\U00002019D\U00002019' was not declared in this scope
   12 | cout << string(dy,’D’) << string(dx,’L’);
      |                   ^~~
a.cc:12:37: error: '\U00002019L\U00002019' was not declared in this scope
   12 | cout << string(dy,’D’) << string(dx,’L’);
      |                                     ^~~
a.cc:21:9: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   21 | cout << endl;
      |         ^~~~
      |         std::endl
In file included from /usr/include/c++/14/istream:41,
                 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/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~