criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <iostream>
# include <string>
int main(void) {
  int sx, sy, tx, ty;
  cin >> sx<< endl;
  cin >> sy<< endl;
  cin >> tx<< endl;
  cin >> ty<< endl;
  string box1, box2;
  int x_diff = tx- sx;
  int y_diff = ty - sy;   
    box1 = string(y_diff, "U");
    box1 += string(x_diff+1, "R");
    box1 += string(y_diff+1, "D");
    box1 += string(x_diff+1, "L");
    box1 += string(1, "U");
    
    box2 = string(x_diff, "R");
    box2 += string(y_diff+1, "U");
    box2 += string(x_diff+1, "L");
    box2 += string(y_diff+1, "D");
    box2 += string(1, "R");
    
    cout << box1 << box2 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> sx<< endl;
      |   ^~~
      |   std::cin
In file included 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:5:15: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 |   cin >> sx<< endl;
      |               ^~~~
      |               std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:9:3: error: 'string' was not declared in this scope
    9 |   string box1, box2;
      |   ^~~~~~
a.cc:9:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:12:5: error: 'box1' was not declared in this scope
   12 |     box1 = string(y_diff, "U");
      |     ^~~~
a.cc:18:5: error: 'box2' was not declared in this scope
   18 |     box2 = string(x_diff, "R");
      |     ^~~~
a.cc:24:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   24 |     cout << box1 << box2 << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <iostream>
# include <string>
int main(void) {
  int sx, sy, tx, ty;
  cin >> sx, sy, tx, ty << endl;
  string box1, box2;
  int x_diff = tx- sx;
  int y_diff = ty - sy;   
    box1 = string(y_diff, "U");
    box1 += string(x_diff+1, "R");
    box1 += string(y_diff+1, "D");
    box1 += string(x_diff+1, "L");
    box1 += string(1, "U");
    
    box2 = string(x_diff, "R");
    box2 += string(y_diff+1, "U");
    box2 += string(x_diff+1, "L");
    box2 += string(y_diff+1, "D");
    box2 += string(1, "R");
    
    cout << box1 << box2 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> sx, sy, tx, ty << endl;
      |   ^~~
      |   std::cin
In file included 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:5:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 |   cin >> sx, sy, tx, ty << endl;
      |                            ^~~~
      |                            std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string box1, box2;
      |   ^~~~~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:9:5: error: 'box1' was not declared in this scope
    9 |     box1 = string(y_diff, "U");
      |     ^~~~
a.cc:15:5: error: 'box2' was not declared in this scope
   15 |     box2 = string(x_diff, "R");
      |     ^~~~
a.cc:21:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |     cout << box1 << box2 << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <iostream>
# include <string>
int main(void) {
  int sx; sy; tx; ty;
  cin >> sx, sy, tx, ty << endl;
  string box1, box2;
  int x_diff = tx- sx;
  int y_diff = ty - sy;   
    box1 = string(y_diff, "U");
    box1 += string(x_diff+1, "R");
    box1 += string(y_diff+1, "D");
    box1 += string(x_diff+1, "L");
    box1 += string(1, "U");
    
    box2 = string(x_diff, "R");
    box2 += string(y_diff+1, "U");
    box2 += string(x_diff+1, "L");
    box2 += string(y_diff+1, "D");
    box2 += string(1, "R");
    
    cout << box1 << box2 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:11: error: 'sy' was not declared in this scope; did you mean 'sx'?
    4 |   int sx; sy; tx; ty;
      |           ^~
      |           sx
a.cc:4:15: error: 'tx' was not declared in this scope; did you mean 'sx'?
    4 |   int sx; sy; tx; ty;
      |               ^~
      |               sx
a.cc:4:19: error: 'ty' was not declared in this scope; did you mean 'tm'?
    4 |   int sx; sy; tx; ty;
      |                   ^~
      |                   tm
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> sx, sy, tx, ty << endl;
      |   ^~~
      |   std::cin
In file included 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:5:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 |   cin >> sx, sy, tx, ty << endl;
      |                            ^~~~
      |                            std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string box1, box2;
      |   ^~~~~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:9:5: error: 'box1' was not declared in this scope
    9 |     box1 = string(y_diff, "U");
      |     ^~~~
a.cc:15:5: error: 'box2' was not declared in this scope
   15 |     box2 = string(x_diff, "R");
      |     ^~~~
a.cc:21:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |     cout << box1 << box2 << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: Java

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int sx = sc.nextInt();
        int sy = sc.nextInt();
        int tx = sc.nextInt();
        int ty = sc.nextInt();
        StringBuilder res = new StringBuilder("");
        for(int i = 0; i < ty - sy; i++)
            res.append('U');
        for(int i = 0; i < tx - sx; i++)
            res.append('R');
        for(int i = 0; i < ty - sy; i++)
            res.append('D');
        for(int i = 0; i < tx - sx; i++)
            res.append('L');
        res.append('D');
        for(int i = 0; i < tx - sx + 1; i++)
            res.append('R');
        for(int i = 0; i < ty - sy + 1; i++)
            res.append('U');
        res.append('L');
        res.append('U');
        for(int i = 0; i < tx - sx + 1; i++)
            res.append('L');
        for(int i = 0; i < ty - sy + 1; i++)
            res.append('D');
        res.append('R');
        System.out.println(res.toString());
        
    }
}


Compiler output:
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include <bits/stdc++.h>
#include <algorithm>
using namespace std;
int main() {
  long long int a,b,c,d,e,f,g[110],h[110];
  cin >>a >>b>>c>>d;
  
  {
  if( d-b>0){
    for(int i=0;i<d-b;i++){
      cout << "U" ;
     
    }
  }
  else if(d-b<0){
    for(int i=0;i<b-d;i++){
      cout <<"D";
      
    }
  }
  }
        
   {
  if( c-a>0){
    for(int i=0;i<c-a;i++){
      cout << "R" ;
      
    }
  }
  else if(c-a<0){
    for(int i=0;i<a-c;i++){
      cout <<"L";
      
    }
  }
  }
  {
  if( d-b<0){
    for(int i=0;i<b-d;i++){
      cout << "U" ;
      
    }
  }
  else if(d-b>0){
    for(int i=0;i<d-b;i++){
      cout <<"D";
      
    }
  }
  }
  {
  if( c-a>0){
    for(int i=0;i<c-a+1;i++){
      cout << "L" ;
     
    }
  }
  else if(c-a<0){
    for(int i=0;i<a-c+1;i++){
      cout <<"R";
      
    }
  }
  }
  {
  if( d-b>0){
    for(int i=0;i<d-b+1;i++){
      cout << "U" ;
      
    }
  }
  else if(d-b<0){
    for(int i=0;i<b-d+1;i++){
      cout <<"D";
     
    }
  }
  }
  {
  if( c-a>0){
    for(int i=0;i<c-a+1;i++){
      cout << "R" ;
     
    }
  }
  else if(c-a<0){
    for(int i=0;i<a-c+1;i++){
      cout <<"L";
      
    }
  }
  }
     {
  if( d-b>0){
    for(int i=0;i<1;i++){
      cout << "D" ;
      
    }
  }
  else if(d-b<0){
    for(int i=0;i<1;i++){
      cout <<"U";
     
    }
  }
  }
  {
  if( c-a>0){
    for(int i=0;i<1;i++){
      cout << "R" ;
     
    }
  }
  else if(c-a<0){
    for(int i=0;i<1;i++){
      cout <<"L";
      
    }
  }
  }
   if( d-b>0){
    for(int i=0;i<d-b+1;i++){
      cout << "D" ;
      
    }
  }
  else if(d-b<0){
    for(int i=0;i<b-d+1;i++){
      cout <<"U";
     
    }
  }
  }
  {
  if( c-a>0){
    for(int i=0;i<c-a+1;i++){
      cout << "L" ;
     
    }
  }
  else if(c-a<0){
    for(int i=0;i<a-c+1;i++){
      cout <<"R";
      
    }
  }
  }
    {
  if( d-b>0){
    for(int i=0;i<1;i++){
      cout << "U" ;
      
    }
  }
  else if(d-b<0){
    for(int i=0;i<1;i++){
      cout <<"D";
     
    }
  }
  }

cout << endl;
}
 

Compiler output:
a.cc:134:3: error: expected unqualified-id before '{' token
  134 |   {
      |   ^
a.cc:148:5: error: expected unqualified-id before '{' token
  148 |     {
      |     ^
a.cc:163:1: error: 'cout' does not name a type
  163 | cout << endl;
      | ^~~~
a.cc:164:1: error: expected declaration before '}' token
  164 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  
  int X, Y, x, y;
  cin >> X >> Y >> x >> y;
  
  x -= X;
  y -= Y;
  
  while(int i; i < y; i++)
    cout << 'U'; 
  while(int i; i < x; i++)
    cout << 'R';
  while(int i; i < y; i++)
    cout << 'D'; 
  while(int i; i < x; i++)
    cout << 'L';
  cout << "LU";
  while(int i; i < y; i++)
    cout << 'U'; 
  while(int i; i < x; i++)
    cout << 'R';
  cout << "RDRD";
  while(int i; i < y; i++)
    cout << 'D'; 
  while(int i; i < x; i++)
    cout << 'L';
  endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: expected initializer before ';' token
   11 |   while(int i; i < y; i++)
      |              ^
a.cc:11:14: error: expected ')' before ';' token
   11 |   while(int i; i < y; i++)
      |        ~     ^
      |              )
a.cc:11:16: error: 'i' was not declared in this scope
   11 |   while(int i; i < y; i++)
      |                ^
a.cc:13:14: error: expected initializer before ';' token
   13 |   while(int i; i < x; i++)
      |              ^
a.cc:13:14: error: expected ')' before ';' token
   13 |   while(int i; i < x; i++)
      |        ~     ^
      |              )
a.cc:15:14: error: expected initializer before ';' token
   15 |   while(int i; i < y; i++)
      |              ^
a.cc:15:14: error: expected ')' before ';' token
   15 |   while(int i; i < y; i++)
      |        ~     ^
      |              )
a.cc:17:14: error: expected initializer before ';' token
   17 |   while(int i; i < x; i++)
      |              ^
a.cc:17:14: error: expected ')' before ';' token
   17 |   while(int i; i < x; i++)
      |        ~     ^
      |              )
a.cc:20:14: error: expected initializer before ';' token
   20 |   while(int i; i < y; i++)
      |              ^
a.cc:20:14: error: expected ')' before ';' token
   20 |   while(int i; i < y; i++)
      |        ~     ^
      |              )
a.cc:22:14: error: expected initializer before ';' token
   22 |   while(int i; i < x; i++)
      |              ^
a.cc:22:14: error: expected ')' before ';' token
   22 |   while(int i; i < x; i++)
      |        ~     ^
      |              )
a.cc:25:14: error: expected initializer before ';' token
   25 |   while(int i; i < y; i++)
      |              ^
a.cc:25:14: error: expected ')' before ';' token
   25 |   while(int i; i < y; i++)
      |        ~     ^
      |              )
a.cc:27:14: error: expected initializer before ';' token
   27 |   while(int i; i < x; i++)
      |              ^
a.cc:27:14: error: expected ')' before ';' token
   27 |   while(int i; i < x; i++)
      |        ~     ^
      |              )
a.cc:29:7: error: statement cannot resolve address of overloaded function
   29 |   endl;
      |       ^
Language: Java

import java.util.Scanner;
import java.util.Set;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int sx = Integer.parseInt(sc.next());
        int sy = Integer.parseInt(sc.next());
        int tx = Integer.parseInt(sc.next());
        int ty = Integer.parseInt(sc.next());
        StringBuilder builder = new StringBuilder();
        int dx = tx-sx;
        int dy = ty-sy;
        char xdir = (dx>0)? 'U' : 'D';
        char ydir = (dy>0)? 'R' : 'L';
        char[] xway = new char[Math.abs(dx)];
        char[] yway = new char[Math.abs(dy)];
        Arrays.fill(xway, xdir);
        Arrays.fill(yway, ydir);
        builder.append(xway);
        builder.append(yway);
        Arrays.fill(xway, rev(xdir));
        Arrays.fill(yway, rev(ydir));
        builder.append(xway);
        builder.append(yway);
        
        xway = new char[Math.abs(dx)+1];
        yway = new char[Math.abs(dy)+1];
        Arrays.fill(xway, xdir);
        Arrays.fill(yway, ydir);
        builder.append(rev(ydir));
        builder.append(xway);
        builder.append(yway);
        builder.append(rev(xdir));

        Arrays.fill(xway, rev(xdir));
        Arrays.fill(yway, rev(ydir));
        builder.append(ydir);
        builder.append(xway);
        builder.append(yway);
        builder.append(xdir);
        
        System.out.println(builder.toString());

    }

    public static char rev(char dir){
        char result;
        if(dir=='U'){result= 'D';}
        else if(dir=='D'){result='U';}
        else if(dir=='R'){result='L';}
        else{result='R';}
        return result;
    } 
}

Compiler output:
Main.java:18: error: cannot find symbol
        Arrays.fill(xway, xdir);
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:19: error: cannot find symbol
        Arrays.fill(yway, ydir);
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:22: error: cannot find symbol
        Arrays.fill(xway, rev(xdir));
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:23: error: cannot find symbol
        Arrays.fill(yway, rev(ydir));
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:29: error: cannot find symbol
        Arrays.fill(xway, xdir);
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:30: error: cannot find symbol
        Arrays.fill(yway, ydir);
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:36: error: cannot find symbol
        Arrays.fill(xway, rev(xdir));
        ^
  symbol:   variable Arrays
  location: class Main
Main.java:37: error: cannot find symbol
        Arrays.fill(yway, rev(ydir));
        ^
  symbol:   variable Arrays
  location: class Main
8 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int sx, sy, tx, ty;

int main() {
    cin >> sx >> sy >> tx >> ty;

    for (int i = sx; i < tx; i++) {
        cout << "R";
    }
    for (int i = sy; i < tx; i++) {
        cout << "U";
    }

    for (int i = tx; i > sx; i--) {
        cout << "L";
    }
    for (int i = ty; i > sy; i--) {
        cout << "D";
    }
    
    cout << "D";
    for (int i = sx; i <= tx; i++) {
        cout << "R";
    }
    for (int i = sy; i <= ty; i++) {
        cout << "U";
    }

    cout << "L" << "U";
    for (int i = tx; i >= sx; i--) {
        cout << "L";
    }
    for (int = ty; i >= sy; i--) {
        cout << "D";
    }
    cout << "R";

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:14: error: expected unqualified-id before '=' token
   36 |     for (int = ty; i >= sy; i--) {
      |              ^
a.cc:36:13: error: expected ';' before '=' token
   36 |     for (int = ty; i >= sy; i--) {
      |             ^~
      |             ;
a.cc:36:14: error: expected primary-expression before '=' token
   36 |     for (int = ty; i >= sy; i--) {
      |              ^
a.cc:36:20: error: 'i' was not declared in this scope
   36 |     for (int = ty; i >= sy; i--) {
      |                    ^
a.cc:36:27: error: expected ')' before ';' token
   36 |     for (int = ty; i >= sy; i--) {
      |         ~                 ^
      |                           )
a.cc:36:29: error: 'i' was not declared in this scope
   36 |     for (int = ty; i >= sy; i--) {
      |                             ^
Language: Java

import javafx.beans.binding.When;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.*;
import java.lang.Math.*;
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        HashMap<Integer,Integer> mem = new HashMap<>();
        int sx = in.nextInt();
        int sy = in.nextInt();
        int tx = in.nextInt();
        int ty = in.nextInt();
        int u = ty-sy;
        int r = tx-sx;
        String t = "";
        for(int i=0;i<u;i++){
            t+="U";
        }
        for(int i=0;i<r;i++){
            t+="R";
        }
        for(int i=0;i<u;i++){
            t+="D";
        }for(int i=0;i<r+1;i++){
            t+="L";
        }
        for(int i=0;i<u+1;i++){
            t+="U";
        }
        for(int i=0;i<r+1;i++){
            t+="R";
        }
        t+="DR";
        for(int i=0;i<u+1;i++) {
            t += "D";
        }
        for(int i=0;i<r+1;i++){
            t+="L";
        }
        System.out.print(t+"U");




    }
}


Compiler output:
Main.java:1: error: package javafx.beans.binding does not exist
import javafx.beans.binding.When;
                           ^
1 error
Language: C++

// C - Back and Forth
#include <bits/stdc++.h>
using namespace std;

int main(){
	int sx,sy,tx,ty;
	cin>>sx>>sy>>tx>>ty;

	int dx = tx-sx;
	int dy = ty-sy;
	string s = "";
	for(int i=1; i<=dy; i++) s += "U";
	for(int i=1; i<=dx; i++) s += "R";
	for(int i=1; i<=dy; i++) s += "D";
	for(int i=1; i<=dx; i++) s += "L";
	dx++; dy++;
	s += "L";
	for(int i=1; i<=dy; i++) s += "U";
	for(int i=1; i<=dx; i++) s += "R";
	s += "DR";
	for(int i=1; i<=dy; i++) s += "D";
	for(int i=1; i<=dx; i++) s += "L";
	s += "U";

	ote(s);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:9: error: 'ote' was not declared in this scope
   25 |         ote(s);
      |         ^~~
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){
	int sx, sy, tx, ty;
	int dx, dy;
	cin >> sx >> sy >> tx >> ty;
	dx = tx - sx;
	dy = ty - sy;
	cout << string(dy, 'U') << string(dx, 'R') << string(dy, 'D') << string(dx, 'L');
	cout << 'L';
	cout << string(dy + 1, 'U') << string(dx + 1, 'R')
	cout << 'D';
	cout << 'R';
	cout << string(dy + 1, 'D') << string(dx + 1, 'L')
	cout << 'U';
	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:13:59: error: expected ';' before 'cout'
   13 |         cout << string(dy + 1, 'U') << string(dx + 1, 'R')
      |                                                           ^
      |                                                           ;
   14 |         cout << 'D';
      |         ~~~~                                               
a.cc:16:59: error: expected ';' before 'cout'
   16 |         cout << string(dy + 1, 'D') << string(dx + 1, 'L')
      |                                                           ^
      |                                                           ;
   17 |         cout << 'U';
      |         ~~~~
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){
	int sx, sy, tx, ty;
	int dx, dy;
	cin >> sx >> sy >> tx >> ty;
	dx = tx - sx;
	dy = ty - sy;
	cout << string(dy, 'U') << sring(dx, 'R') << string(dy, 'D') << sring(dx, 'L');
	cout << 'L';
	cout << string(dy + 1, 'U') << sring(dx + 1, 'R')
	cout << 'D';
	cout << 'R';
	cout << string(dy + 1, 'D') << sring(dx + 1, 'L')
	cout << 'U';
	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:11:36: error: 'sring' was not declared in this scope
   11 |         cout << string(dy, 'U') << sring(dx, 'R') << string(dy, 'D') << sring(dx, 'L');
      |                                    ^~~~~
Language: C++

#include <iostream>
#include <sting>
using namespace std;

int main(){
	int sx, sy, tx, ty;
	int dx, dy;
	cin >> sx >> sy >> tx >> ty;
	dx = tx - sx;
	dy = ty - sy;
	cout << string(dy, 'U') << sring(dx, 'R') << string(dy, 'D') << sring(dx, 'L');
	cout << 'L';
	cout << string(dy + 1, 'U') << sring(dx + 1, 'R')
	cout << 'D';
	cout << 'R';
	cout << string(dy + 1, 'D') << sring(dx + 1, 'L')
	cout << 'U';
	return 0;
}

Compiler output:
a.cc:2:10: fatal error: sting: No such file or directory
    2 | #include <sting>
      |          ^~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >> ty;
  for(int i = 0; i < tx - sx; i++){
    cout << "R";
  }
  for(int i = 0; i < ty - sy; i++){
    cout << "U";
  }
  for(int i = 0; i < tx - sx; i++){
    cout << "L";
  }
  for(int i = 0; i < ty - sy; i++){
    cout << "D";
  }
  
  cout << "D";
  for(int i = 0; i <= tx - sx; i++){
    cout << "R";
  }
  for(int i = 0; i <= ty - sy; i++){
    cout << "U";
  }
  cout << "LU"
  for(int i = 0; i <= tx - sx; i++){
    cout << "L";
  }
  for(int i = 0; i <= ty - sy; i++){
    cout << "D";
  }
  cout << "R" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:15: error: expected ';' before 'for'
   27 |   cout << "LU"
      |               ^
      |               ;
   28 |   for(int i = 0; i <= tx - sx; i++){
      |   ~~~          
a.cc:28:18: error: 'i' was not declared in this scope
   28 |   for(int i = 0; i <= tx - sx; i++){
      |                  ^
Language: C++

#include <iostream>
#include <string>
#include <algorithm>
#include <cstdio>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <numeric>
#include <cmath>
#include <cassert>

using namespace std;

typedef long long int ll;
typedef pair<int,int> P;

#define all(x) x.begin(),x.end()

const ll mod = 1e9+7;
const ll INF = 1e9;

ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

int main()
{
	int x,y,a,b;
	cin>>x>>y>>a>>b;
	// vector<string> ans;
	// for (int i = x; i < a; i++){
	// 	ans.push_back("R");
	// }
	// for (int i = y; i < b; i++){
	// 	ans.push_back("U");
	// }
	// for (int i = x; i < a; i++){
	// 	ans.push_back("L");
	// }
	// for (int i = y; i < b; i++){
	// 	ans.push_back("D");
	// }

	// ans.push_back("D");
	// for (int i = x; i < a+1; i++){
	// 	ans.push_back("R");
	// }
	// for (int i = y-1; i < b; i++){
	// 	ans.push_back("U");
	// }
	// ans.push_back("L");
	// ans.push_back("U");
	// for (int i = a; i > x-1; i--){
	// 	ans.push_back("L");
	// }
	// for (int i = b+1; i > y; i--){
	// 	ans.push_back("D");
	// }
	// ans.push_back("R");
	// for(auto c:ans)
	// 	cout<<c;
	// cout<<endl;

	dx = a-x, dy=b-y
	cout<<string(dx,"R") << string(dy,"U")
	cout<<string(dx,"L") << string(dy,"D")
	cout<<"D"<< string(dx+1,"R")<<string(dy+1,"U")<<"L"
	cout<<"U"<<string(dx+1,"L")<<string(dy+1,"D")<<"R"<<endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:66:12: error: incompatible types in assignment of 'int' to 'int [4]'
   66 |         dx = a-x, dy=b-y
      |         ~~~^~~~~
a.cc:66:21: error: incompatible types in assignment of 'int' to 'int [4]'
   66 |         dx = a-x, dy=b-y
      |                   ~~^~~~
Language: C++

#include <bits/stdc++.h>

int main(){
  int route[4];
  for (int i=0;i<4;i++) cin >> route[i];
  const int dx = route[2] - route[0];
  const int dy = route[3] - route[1];
  cout << string(dx, 'R') << string(dy, 'U');
  cout << string(dx, 'L') << string(dy, 'D');
  cout << 'D' << string(dx+1, 'R') << string(dy+1, 'U') << 'L';
  cout << 'U' << string(dx+1, 'L') << string(dy+1, 'D') << 'R';
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:25: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   for (int i=0;i<4;i++) cin >> route[i];
      |                         ^~~
      |                         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:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout << string(dx, 'R') << string(dy, 'U');
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:8:11: error: 'string' was not declared in this scope
    8 |   cout << string(dx, 'R') << string(dy, 'U');
      |           ^~~~~~
a.cc:8:11: 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>;
      |           ^~~~~~
Language: C++

#incliude <bits/stdc++.h>

int main(){
  int route[4];
  for (int i=0;i<4;i++) cin >> route[i];
  const int dx = route[2] - route[0];
  const int dy = route[3] - route[1];
  cout << string(dx, 'R') << string(dy, 'U');
  cout << string(dx, 'L') << string(dy, 'D');
  cout << 'D' << string(dx+1, 'R') << string(dy+1, 'U') << 'L';
  cout << 'U' << string(dx+1, 'L') << string(dy+1, 'D') << 'R';
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #incliude; did you mean #include?
    1 | #incliude <bits/stdc++.h>
      |  ^~~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:5:25: error: 'cin' was not declared in this scope
    5 |   for (int i=0;i<4;i++) cin >> route[i];
      |                         ^~~
a.cc:8:3: error: 'cout' was not declared in this scope
    8 |   cout << string(dx, 'R') << string(dy, 'U');
      |   ^~~~
a.cc:8:11: error: 'string' was not declared in this scope
    8 |   cout << string(dx, 'R') << string(dy, 'U');
      |           ^~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
string s;
int main(){
  cin>>s;
  for(int i=0;i<s.length();i++){
    if(i==4||i==13)cout<<' ';
    else cout<<s[i];
  }
  cout<<endl;
}

using namespace std;
int sx,sy,gx,gy,ans;
int main(){
    cin>>sx>>sy>>gx>>gy;
    for (int i=0; i<(gy-sy); i++) {
        cout<<'U';
    }
    for (int i=0; i<(gx-sx); i++) {
        cout<<'R';
    }
    for (int i=0; i<(gy-sy); i++) {
        cout<<'D';
    }
    for (int i=0; i<(gx-sx); i++) {
        cout<<'L';
    }
    cout<<'L';
    for (int i=0; i<(gy-sy)+1; i++) {
        cout<<'U';
    }
    for (int i=0; i<(gx-sx)+1; i++) {
        cout<<'R';
    }
    cout<<'D';
    cout<<'R';
    for (int i=0; i<(gy-sy)+1; i++) {
        cout<<'D';
    }
    for (int i=0; i<(gx-sx)+1; i++) {
        cout<<'L';
    }
    cout<<'U'<<endl;

}

Compiler output:
a.cc:15:5: error: redefinition of 'int main()'
   15 | int main(){
      |     ^~~~
a.cc:4:5: note: 'int main()' previously defined here
    4 | int main(){
      |     ^~~~
Language: C++

#include <cstdio>
#define N 100006
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);
using namespace std;

int main()
{
  	fast;
 	int x,y,x1,y1,x2,y2;
	scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
	x=x1,y=y1;
	while(x1<x2)x1++,printf("R");
	while(y1<y2)y1++,printf("U");
	while(x1>x)x1--,printf("L");
	while(y1>y)y1--,printf("D");
	printf("D");
	while(x1<x2)x1++,printf("R");
	printf("R");printf("U");
	while(y1<y2)y1++,printf("U");
	printf("L");
	printf("U");
	while(x1>x)x1--,printf("L");
	printf("L");printf("D");
	while(y1>y)y1--,printf("D");
	printf("R");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:14: error: 'ios_base' has not been declared
    3 | #define fast ios_base::sync_with_stdio(false);cin.tie(NULL);
      |              ^~~~~~~~
a.cc:8:9: note: in expansion of macro 'fast'
    8 |         fast;
      |         ^~~~
a.cc:3:47: error: 'cin' was not declared in this scope
    3 | #define fast ios_base::sync_with_stdio(false);cin.tie(NULL);
      |                                               ^~~
a.cc:8:9: note: in expansion of macro 'fast'
    8 |         fast;
      |         ^~~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include <cstdio>
  +++ |+#include <iostream>
    2 | #define N 100006
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main(){
int A,B,C,D;
  string S;
  cin>>A>>B>>C>>D;
  int E=C-A;
  int F=D-B;
  for(int i=0;i<E)
    cout<<'R';
  for(int i=0;i<F)
    cout<<'U';
  for(int i=0;i<E)
    cout<<'L';
  for(int i=0;i<F)
    cout<<'D';
  cout<<'D';
  for(int i=0;i<E+1)
    cout<<'R';
  for(int i=0;i<F+1)
    cout<<'U';
  cout<<'L';
  cout<<'U';
  for(int i=0;i<E+1)
    cout<<'L';
  for(int i=0;i<F+1)
    cout<<'D';
  cout<<'R'<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:18: error: expected ';' before ')' token
   10 |   for(int i=0;i<E)
      |                  ^
      |                  ;
a.cc:12:18: error: expected ';' before ')' token
   12 |   for(int i=0;i<F)
      |                  ^
      |                  ;
a.cc:14:18: error: expected ';' before ')' token
   14 |   for(int i=0;i<E)
      |                  ^
      |                  ;
a.cc:16:18: error: expected ';' before ')' token
   16 |   for(int i=0;i<F)
      |                  ^
      |                  ;
a.cc:19:20: error: expected ';' before ')' token
   19 |   for(int i=0;i<E+1)
      |                    ^
      |                    ;
a.cc:21:20: error: expected ';' before ')' token
   21 |   for(int i=0;i<F+1)
      |                    ^
      |                    ;
a.cc:25:20: error: expected ';' before ')' token
   25 |   for(int i=0;i<E+1)
      |                    ^
      |                    ;
a.cc:27:20: error: expected ';' before ')' token
   27 |   for(int i=0;i<F+1)
      |                    ^
      |                    ;
Language: Java

public class Main {

	public static void main(String[] args) {
		StringBuilder sb = new StringBuilder();
		Scanner in = new Scanner(System.in);
		int x = in.nextInt();
		int y = in.nextInt();
		int tx = in.nextInt();
		int ty = in.nextInt();
		in.close();
		
		int dx = tx - x;
		int dy = ty - y;
		
		for (int i = 0; i < dx; i++) {
			sb.append("R");
		}
		for (int i = 0; i < dy; i++) {
			sb.append("U");
		}
		for (int i = 0; i < dx; i++) {
			sb.append("L");
		}
		for (int i = 0; i <= dy; i++) {
			sb.append("D");
		}
		for (int i = 0; i <= dx; i++) {
			sb.append("R");
		}
		for (int i = 0; i <= dy; i++) {
			sb.append("U");
		}
		sb.append("L");
		sb.append("U");
		for (int i = 0; i <= dx; i++) {
			sb.append("L");
		}
		for (int i = 0; i <= dy; i++) {
			sb.append("U");
		}
		sb.append("L");
		System.out.println(sb.toString());
	}

}


Compiler output:
Main.java:5: error: cannot find symbol
		Scanner in = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:5: error: cannot find symbol
		Scanner in = new Scanner(System.in);
		                 ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >>ty;
  int dx,dy;
  dx=tx-sx;
  dy=ty-sy;
  for(int i=0;i<dx;i++){
    cout << "R";
  }
  for(int i=0;i<dy;i++){
    cout << "U";
  }
  for(int i=0;i<dx;i++){
    cout << "L";
  }
  for(int i=0;i<dy;i++){
    cout << "D";
  }
  cout << "D";
  for(int i=0;i<dx+1;i++){
    cout << "R";
  }
  for(int i=0;i<dy+1;i++){
    cout << "U";
  }
  cout << "L";
  cout << "U";
  for(int i=0;i<dx+1;i++){
    cout << "L";
  }
  for(int i=0;i<dy+1;i++){
    cout << "D";
  }
  ;

Compiler output:
a.cc: In function 'int main()':
a.cc:37:4: error: expected '}' at end of input
   37 |   ;
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >>ty;
  int dx,dy;
  dx=tx-sx;
  dy=ty-sy;
  for(int i=0;i<dx;i++){
    cout << "R";
  }
  for(i=0;i<dy;i++){
    cout << "U";
  }
  for(i=0;i<dx;i++){
    cout << "L";
  }
  for(i=0;i<dy;i++){
    cout << "D";
  }
  cout << "D";
  for(i=0;i<dx+1;i++){
    cout << "R";
  }
  for(i=0;i<dy+1;i++){
    cout << "U";
  }
  cout << "L";
  cout << "U";
  for(i=0;i<dx+1;i++){
    cout << "L";
  }
  for(i=0;i<dy+1;i++){
    cout << "D";
  }
  ;

Compiler output:
a.cc: In function 'int main()':
a.cc:13:7: error: 'i' was not declared in this scope
   13 |   for(i=0;i<dy;i++){
      |       ^
a.cc:16:7: error: 'i' was not declared in this scope
   16 |   for(i=0;i<dx;i++){
      |       ^
a.cc:19:7: error: 'i' was not declared in this scope
   19 |   for(i=0;i<dy;i++){
      |       ^
a.cc:23:7: error: 'i' was not declared in this scope
   23 |   for(i=0;i<dx+1;i++){
      |       ^
a.cc:26:7: error: 'i' was not declared in this scope
   26 |   for(i=0;i<dy+1;i++){
      |       ^
a.cc:31:7: error: 'i' was not declared in this scope
   31 |   for(i=0;i<dx+1;i++){
      |       ^
a.cc:34:7: error: 'i' was not declared in this scope
   34 |   for(i=0;i<dy+1;i++){
      |       ^
a.cc:37:4: error: expected '}' at end of input
   37 |   ;
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >>ty;
  int dx,dy;
  dx=tx-sx;
  dy=ty-sy;
  for(i=0;i<dx;i++){
    cout << R;
  }
  for(i=0;i<dy;i++){
    cout << U;
  }
  for(i=0;i<dx;i++){
    cout << L;
  }
  for(i=0;i<dy;i++){
    cout << D;
  }
  cout << D;
  for(i=0;i<dx+1;i++){
    cout << R;
  }
  for(i=0;i<dy+1;i++){
    cout << U;
  }
  cout << L;
  cout << U;
  for(i=0;i<dx+1;i++){
    cout << L;
  }
  for(i=0;i<dy+1;i++){
    cout << D;
  }
  ;

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'i' was not declared in this scope
   10 |   for(i=0;i<dx;i++){
      |       ^
a.cc:11:13: error: 'R' was not declared in this scope
   11 |     cout << R;
      |             ^
a.cc:13:7: error: 'i' was not declared in this scope
   13 |   for(i=0;i<dy;i++){
      |       ^
a.cc:14:13: error: 'U' was not declared in this scope
   14 |     cout << U;
      |             ^
a.cc:16:7: error: 'i' was not declared in this scope
   16 |   for(i=0;i<dx;i++){
      |       ^
a.cc:17:13: error: 'L' was not declared in this scope
   17 |     cout << L;
      |             ^
a.cc:19:7: error: 'i' was not declared in this scope
   19 |   for(i=0;i<dy;i++){
      |       ^
a.cc:20:13: error: 'D' was not declared in this scope
   20 |     cout << D;
      |             ^
a.cc:22:11: error: 'D' was not declared in this scope
   22 |   cout << D;
      |           ^
a.cc:23:7: error: 'i' was not declared in this scope
   23 |   for(i=0;i<dx+1;i++){
      |       ^
a.cc:24:13: error: 'R' was not declared in this scope
   24 |     cout << R;
      |             ^
a.cc:26:7: error: 'i' was not declared in this scope
   26 |   for(i=0;i<dy+1;i++){
      |       ^
a.cc:27:13: error: 'U' was not declared in this scope
   27 |     cout << U;
      |             ^
a.cc:29:11: error: 'L' was not declared in this scope
   29 |   cout << L;
      |           ^
a.cc:30:11: error: 'U' was not declared in this scope
   30 |   cout << U;
      |           ^
a.cc:31:7: error: 'i' was not declared in this scope
   31 |   for(i=0;i<dx+1;i++){
      |       ^
a.cc:34:7: error: 'i' was not declared in this scope
   34 |   for(i=0;i<dy+1;i++){
      |       ^
a.cc:37:4: error: expected '}' at end of input
   37 |   ;
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include "bits/stdc++.h"
using namespace std;
#include "pch.h"
using namespace std;
#include <string>
#include <iostream>
int main() {
	int sx, sy, tx, ty;
	cin >> sx >> sy >> tx >> ty;
	int dx = tx - sx;
	int dy = ty - sy;

	for (int i = 0; i < dy; i++) putchar('U');
	for (int i = 0; i < dx; i++) putchar('R');

	for (int i = 0; i < dy; i++) putchar('D');
	for (int i = 0; i < dx; i++) putchar('L');

	putchar('L');
	for (int i = 0; i < dy; i++) putchar('U');
	putchar('U');
	for (int i = 0; i < dx; i++) putchar('R');
	putchar('R');
	putchar('D');

	putchar('R');
	for (int i = 0; i < dy; i++) putchar('D');
	putchar('D');
	for (int i = 0; i < dx; i++) putchar('L');
	putchar('L');
	putchar('U');
}


Compiler output:
a.cc:3:10: fatal error: pch.h: No such file or directory
    3 | #include "pch.h"
      |          ^~~~~~~
compilation terminated.
Language: C++

#include <iostream>
using namespace std;

int main(){
    int sx, sy, tx, ty;
    cin >> sx >> sy >> tx >> ty;
    int dx = tx - sx;
    int dy = ty - sy;

    cout << strig(dx,'R') << strig(dy,'U') << endl;
    cout << strig(dx,'L') << strig(dy,'D') << endl;
    cout << 'L' <<strig(dy,'U') << strig(dx,'R') << 'R' << endl;
    cout << 'R' <<strig(dy,'D') << strig(dx,'L') << 'L' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'strig' was not declared in this scope
   10 |     cout << strig(dx,'R') << strig(dy,'U') << endl;
      |             ^~~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
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:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
int main(){
  int sx,sy,ts,ty;
  cin>>sx>>sy>>tx>>ty;
  rep(i,ty-sy){
    cout<<'U';
  }
  rep(i,tx-sx){
    cout<<'R';
  }
  rep(i,ty-sy){
    cout<<'D';
  }
  rep(i,tx-sx+1){
    cout<<'L';
  }
  rep(i,ty-sy+1){
    cout<<'U';
  }
  rep(i,tx-sx+1){
    cout<<'R';
  }
  cout<<'D'<<'R';
  rep(i,ty-sy+1){
    cout<<'D';
  }
  rep(i,tx-sx+1){
    cout<<'L';
  }
  cout<<'U'<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: 'tx' was not declared in this scope; did you mean 'ty'?
    6 |   cin>>sx>>sy>>tx>>ty;
      |                ^~
      |                ty
Language: Java

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner kbd = new Scanner(System.in);
        int sx = kbd.nextInt();
        int sy = kbd.nextInt();
        int tx = kbd.nextInt();
        int ty = kbd.nextInt();
        int[] s = { sx, sy };
        int[] t = { tx, ty };

        // いちどめ
        move(s, t);
        move(t, s);

        // にどめ
        int[] s1 = { sx - 1, sy };
        int[] t1 = { tx, ty + 1 };
        move(s, s1);
        move(s1, t1);
        move(t1, t);
        int[] s2 = { sx, sy - 1 };
        int[] t2 = { tx + 1, ty };
        move(t, t2);
        move(t2, x2);
        move(x2, x);
        System.out.println();
    }

    static void move(int[] s, int[] t) {
        moveX(s[0], t[0]);
        moveY(s[1], t[1]);
    }

    static void moveX(int s, int t) {
        if (s < t) {
            for (int i = 0; i < t - s; i++) {
                System.out.print("R");
            }
        } else if (s == t) {
            return;
        } else {
            for (int j = s; j > t; j--) {
                System.out.print("L");
            }
        }
        return;
    }

    static void moveY(int s, int t) {
        if (s < t) {
            for (int i = 0; i < t - s; i++) {
                System.out.print("U");
            }
        } else if (s == t) {
            return;
        } else {
            for (int j = s; j > t; j--) {
                System.out.print("D");
            }
        }
        return;
    }
}

Compiler output:
Main.java:26: error: cannot find symbol
        move(t2, x2);
                 ^
  symbol:   variable x2
  location: class Main
Main.java:27: error: cannot find symbol
        move(x2, x);
             ^
  symbol:   variable x2
  location: class Main
Main.java:27: error: cannot find symbol
        move(x2, x);
                 ^
  symbol:   variable x
  location: class Main
3 errors
Language: Java

import java.util.*;

public class BackAndForth {
    public static void main(String[] args) {
        Scanner kbd = new Scanner(System.in);
        int sx = kbd.nextInt();
        int sy = kbd.nextInt();
        int tx = kbd.nextInt();
        int ty = kbd.nextInt();
        int[] s = { sx, sy };
        int[] t = { tx, ty };

        // いちどめ
        move(s, t);
        move(t, s);

        // にどめ
        int[] s1 = { sx, sy - 1 };
        int[] t1 = { tx + 1, ty };
        System.out.print("D");
        move(s1, t1);
        System.out.print("L");
        int[] t2 = { tx, ty + 1 };
        int[] s2 = { sx - 1, sx };
        System.out.print("U");
        move(t2, s2);
        System.out.println("R");
    }

    static void move(int[] s, int[] t) {
        moveX(s[0], t[0]);
        moveY(s[1], t[1]);
    }

    static void moveX(int s, int t) {
        if (s < t) {
            for (int i = 0; i < t - s; i++) {
                System.out.print("R");
            }
            return;
        } else {
            for (int j = s; j > t; j--) {
                System.out.print("L");
            }
        }
    }

    static void moveY(int s, int t) {
        if (s < t) {
            for (int i = 0; i < t - s; i++) {
                System.out.print("U");
            }
            return;
        } else {
            for (int j = s; j > t; j--) {
                System.out.print("D");
            }
        }
    }
}

Compiler output:
Main.java:3: error: class BackAndForth is public, should be declared in a file named BackAndForth.java
public class BackAndForth {
       ^
1 error
Language: C++

#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
#include<string>
#include<queue>
#include<set>
#include<map>
using namespace std;
typedef long long int ll;
typedef vector<pair<ll,ll> > Q;
typedef pair<int,int> P;
#define rep(i,n) for(int i=0;i<(int)(n);i++)

int main()
{
  int sx,sy,tx,ty;
  cin>>sx>>sy>>tx>>ty;

  rep(i,tx-sx) cout<<'R';
  rep(i,ty-sy) cout<<'U';

  rep(i,tx-sx) cout<<'L';
  rep(i,ty-sy) cout<<'D';

  cout<<'D';
  rep(i,tx-sx+1) cout<<'R';
  rep(i,ty-sy+1) cout<<'U';
  cout<<'L';

  cout<<'U';
  rep(i,tx-sx+1) cout<<'L';
  rep(i,ty-sy+1) cout<<'D';
  cout<<'R';

  cout<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:36:14: error: expected '}' at end of input
   36 |   cout<<endl;
      |              ^
a.cc:16:1: note: to match this '{'
   16 | {
      | ^
Language: C++

#include <iostream>

using namespace std;

int main(void) {
	int sx, sy, gx, gy, i;
	scanf_s("%d%d%d%d", &sx, &sy, &gx, &gy);
	for (i = sy; i < gy; i++)
		printf("U");
	for (i = sx; i < gx; i++)
		printf("R");
	for (i = sy; i < gy; i++)
		printf("D");
	for (i = sx; i <= gx; i++)
		printf("L");
	for (i = sy; i <= gy; i++)
		printf("U");
	for (i = sx; i <= gx; i++)
		printf("R");
	printf("DR");
	for (i = sy; i <= gy; i++)
		printf("D");
	for (i = sx; i <= gx; i++)
		printf("L");
	printf("U\n");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'scanf_s' was not declared in this scope; did you mean 'scanf'?
    7 |         scanf_s("%d%d%d%d", &sx, &sy, &gx, &gy);
      |         ^~~~~~~
      |         scanf
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
    int sx,sy,tx,ty,x,y;
    cin >> sx >> sy >> tx >> ty;
    x=sx;y=sy;

    while(y < ty){
        cout << 'U';
        y++;
    }
    while(x<tx){
        cout << 'R';
        x++;
    }
    while(sy<y){
        cout << 'D';
        y--;
    }
    while(sx-1<x){
        cout << 'L';
        x--;
    }
    
    while(y<ty+1){
        cout << 'U';
        y++;
    }
    while(x<tx){
        cout << 'R';
        x++;
    }
    y--;cout<<'D';
    x++;cout<<'R';

    while(sy-1<y){
        cout << 'D';
        y--;
    }
    cout << string(x-sx,L);
    
    y++;cout << 'U'<<endl;
}
//string(文字数、中身)でstringを宣言できることを利用すると簡潔に書ける

Compiler output:
a.cc: In function 'int main()':
a.cc:41:25: error: 'L' was not declared in this scope
   41 |     cout << string(x-sx,L);
      |                         ^