criyle/codenet-compile-errors huggingface dataset:
Language: Java



import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] s = br.readLine().split(" ", 0);
		int K = Integer.parseInt(s[0]);
		int S = Integer.parseInt(s[1]);
		int X, Y, Z = 0;
		int count = 0;
		for (X = 0; X <= K; X++) {
			for (Y = 0; Y <= K; Y++) {
				if (X + Y + Z == S) {
					count += 1;
					break;
				}
				for (Z = 0; Z <= K; Z++) {
					if (X + Y + Z == S) {
						count += 1;
						break;
					}
				}
			}
		}
		System.out.println(count);
	}
}
}

Compiler output:
Main.java:33: error: class, interface, enum, or record expected
}
^
1 error
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <map>
#define REP(i,n) for (int i=0;i<(n);i++)
#define ll long long
#define ull unsigned long long
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

using namespace std;

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
	int k,s;
	cin >> k >> s;
	int ct=0;
	REP(i,k){
		REP(j,k){
			int z = s - i - j;
			if(z >= 0 && z <= k)ct++;
		}
	}
		cout << ct << endl;
	}
  return 0;
}


Compiler output:
a.cc:29:3: error: expected unqualified-id before 'return'
   29 |   return 0;
      |   ^~~~~~
a.cc:30:1: error: expected declaration before '}' token
   30 | }
      | ^
Language: Java

import java.util.*;
 
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		int s = sc.nextInt();
		int c=0;
	        int ans = 0;
 
		for( int a=0; a<=k; a++ ){
			for(int b=0; b<=k; b++){
				c = s-a-b;
				if( z >= 0 && z <= k){
					ans++;
				}
			}
		}

		System.out.println(ans);
		return;
	}
}

Compiler output:
Main.java:14: error: cannot find symbol
				if( z >= 0 && z <= k){
				    ^
  symbol:   variable z
  location: class Main
Main.java:14: error: cannot find symbol
				if( z >= 0 && z <= k){
				              ^
  symbol:   variable z
  location: class Main
2 errors
Language: C++

#include<bits/stdc++.h>

#define int long long int
#define rep(a,b,c) for(int a=b;a<c;a++)
#define repm(a,b,c) for(int a=(b-1);a>=c;a--)
#define pb push_back
#define str string
#define sf(a) scanfs("%d",&a)
#define pb push_back
#define mp make_pair
#define Fi first
#define Se second
#define ALL(v) (v).begin(), (v).end()

using namespace std;

const int INF = 1e18 + 9;
const int Mod = 1e9 + 7;
inline int replac(str s){double ans=0;rep(i,0,s.length()){ans+=(s[i]-'0')*pow(10,s.length()-i-1);}return (int)ans;}
inline string numstr(int m){str s="";while(m>0){char c;int a=m/10;if(a>0)a=m%(a*10);else a=m;c=(char)('0'+a);s+=c;m/=10;}str st="";for(int i=s.size()-1;i>=0;i--){st+=s[i];}return st;}
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vii;
str s;
void ans2();
void ans3();
signed main()
{
    /*
    cin >> s;
    rep(i,0,s.size()){
        if(s[i]==',')cout << " ";
        else cout << s[i];
    }
    cout << endl;
*/
 //   str ss;
 //   cin >> ss;
 //   cout << ss.size() << endl;
    //ans2();
    ans3();
    return 0;
}
/*
void ans2(){
    int a,b,c,d;
    cin >> a >> b >> c >> d;
    str a1="";
    str a2="";
    str b1="";
    str b2="";
    rep(i,b,d){
        a1+='U';
        b1+='D';
    }
    rep(j,a,c){
        a2+='R';
        b2+='L';
    }
    str ans=a1;
    ans+=a2;
    ans+=b1;
    ans+=b2;
    ans+='L';
    ans+=a1;
    ans+='U';
    ans+=a2;
    ans+="RDR";
    ans+=b1;
    ans+='D';
    ans+=b2;
    ans+="LU";
    cout << ans << endl;
 //   cout << ans.size() << endl;
    return ;
}*/

set<string> an;
void ans3(){
    int n,m;
    cin >> n >> m;
    rep(i,0,n){
        rep(j,0,n){
            if((i+j)>=(m-n)&&(i+j)<=m){
                str ss=to_string(i);
                ss+='#';
                ss+=to_string(j);
                ss+='#';
                ss+=to_string(m-(i+j));
                an.insert(ss);
            }
        }
    }
    cout << ss.size() << endl;
    return;
}



Compiler output:
a.cc: In function 'void ans3()':
a.cc:94:13: error: 'ss' was not declared in this scope; did you mean 's'?
   94 |     cout << ss.size() << endl;
      |             ^~
      |             s
Language: C

#include<cstdio>
int main(){
  int k,s;
  scanf("%d%d",&k,&s);
  printf("%d\n",(++s*s+s-(k>s?0:3*(s-k)*(s-k-1))+(k*2>s?0:3*(s-2*k-1)*(s-2*k-2)))/2);++s;
  return 0;
}


Compiler output:
main.c:1:9: fatal error: cstdio: No such file or directory
    1 | #include<cstdio>
      |         ^~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<vector>
#include<math.h>
using namespace std;

int main() {
  int a, b, ans = 0;
  cin >> a >> b;
  for(int i = 0; i <= a; i++) {
    if(b < i + j + k) break;
    for(int j = 0; j <= a; j++) {
      if(b < i + j + k) break;
      for(int k = 0; k <= a; k++) {
        if(b < i + j + k) break;
        if(i + j + k == b) ans++;
      }
    }
  }
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: 'j' was not declared in this scope
   10 |     if(b < i + j + k) break;
      |                ^
a.cc:10:20: error: 'k' was not declared in this scope
   10 |     if(b < i + j + k) break;
      |                    ^
a.cc:12:22: error: 'k' was not declared in this scope
   12 |       if(b < i + j + k) break;
      |                      ^
Language: C

#include <stdio.h>

int main(){
  int K, S;
  int cnt = 0;
  scanf("%d", &K);
  scanf("%d", &S);
    if(3*K == S) {
      printf("1\n");
      return 0;
    }
  
  for(int i = 0; i <=K; i++) {
      if(i+K+K < S) break;
    for(int j = 0; j <=K; j++) {
        if(i+j+K < S) break;
        if(i+j+K/2 > S) {
            for(int l = 0; l <=K; l++) {
                if(i+j+l == S) {
                    cnt++;
                    break;
                }
            }
        } else {
            for(int l = K/2; l <=K; l++) {
                if(i+j+l == S) {
                    cnt++;
                    break;
        }
    }
  }
  printf("%d\n", cnt);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:34:1: error: expected declaration or statement at end of input
   34 | }
      | ^
main.c:34:1: error: expected declaration or statement at end of input
Language: C

#include <stdio.h>

int main(){
  int K, S;
  int cnt = 0;
  scanf("%d", &K);
  scanf("%d", &S);
    if(3*K == S) {
      printf("1\n");
      return 0;
    }
  
  for(int i = 0; i <=K; i++) {
      if(i+K+K < S) break;
    for(int j = 0; j <=K; j++) {
        if(i+j+K < S) break;
        if(i+j+k/2 > S) {
            for(int l = 0; l <=K; l++) {
                if(i+j+l == S) {
                    cnt++;
                    break;
                }
            }
        } else {
            for(int l = K/2; l <=K; l++) {
                if(i+j+l == S) {
                    cnt++;
                    break;
        }
    }
  }
  printf("%d\n", cnt);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:17:16: error: 'k' undeclared (first use in this function)
   17 |         if(i+j+k/2 > S) {
      |                ^
main.c:17:16: note: each undeclared identifier is reported only once for each function it appears in
main.c:34:1: error: expected declaration or statement at end of input
   34 | }
      | ^
main.c:34:1: error: expected declaration or statement at end of input
Language: C

#include <stdio.h>

int main(){
  int K, S;
  int cnt = 0;
  scanf(" %d", &K);
  scanf(" %d", &S);
    if(3*K == S) {
      printf("1\n");
      return 0;
    }
  
  for(int i = 0; i <=K; i++) {
    for(int j = 0; j <=K; j++) {
      for(int l = 0; l <=K; l++) {
          if(i+j+l == S) {
              cnt++;
              break
          }
      }
    }
  }
  printf("%d\n", cnt);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:18:20: error: expected ';' before '}' token
   18 |               break
      |                    ^
      |                    ;
   19 |           }
      |           ~
Language: C++

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(a); i<(b); i++)
#define all(c) (c).begin(),(c).end()
#define rall(c) (c).rbegin(),(c).rend()
#define sort(v,n) sort(v,v+n);
#define vsort(v) sort(v.begin(),v.end());
#define ll long long
#define pb(a) push_back(a)
#define fi first
#define se second
#define inf 999999999
using namespace std;
typedef pair<int,int> p;
typedef pair<ll,ll> lp;
bool is_uruu(int y) {
        return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
}
const ll MOD=1e9+7;
//---------------------------------------------------------------------------//

int main(){
        int s,k;
        cin>>k;
        cin>>s;
        if(3*k==s) {
                cout<<1<<endl;
                return 0;
        }
        else if(3*k-1==s) {
                cout<<3<<endl;
                return 0;
        }else if(3*k-2>=as) {
                cout<<(k+1)*k*(k-1)<<endl;
        }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:25: error: 'as' was not declared in this scope; did you mean 's'?
   32 |         }else if(3*k-2>=as) {
      |                         ^~
      |                         s
Language: C++

// b.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
using namespace std;

int main()
{
	int K, S;
	cin >> K >> S;
	int res = 0;
	for (int left = 0; left <= K; left++)
	{
		int right = K;
		for (; right >= left; right--)
		{
			int mid = S - left - right;
			if (mid < left || mid > right)
				continue;

			if (left == right && mid == left)
				res += 1;
			else if (left != mid && left != right && mid != right)
				res += 6;
			else
				res += 3;
			
		}
	}
	cout << res << endl;
    return 0;
}


Compiler output:
a.cc:4:10: fatal error: stdafx.h: No such file or directory
    4 | #include "stdafx.h"
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>

int main(void){

  int k,s;
  int i=0;
  int a, b, c;

  scanf("%d %d",&k,&s);

  for(a=0;a<=k;a++){
    for(b=0;b<=k;b++){
      for(c=0;c<=k;c++){
        if(a+b+c==s)i++;
        else(a+b+c>s)break;
      }
    }
  }

  printf("%d\n",i);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:15:22: error: expected ';' before 'break'
   15 |         else(a+b+c>s)break;
      |                      ^~~~~
      |                      ;
Language: C

include<stdio.h>

int main(void){
        int K,S;
        int x,y,z;
        int count = 0;

        scanf("%d %d",&K,&S);

        for(x=0;x<=K;x++){
                for(y=0;y<=K;y++){
                        for(z=0;z<=K;z++){
                                if(x+y+z==S){
                                        count++;
                                }
                        }
                }
        }

        printf("%d\n",count);

return 0;
}

Compiler output:
main.c:1:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include<stdio.h>
      |        ^
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <set>
#include <map>
#include <queue>
#include <stack>
using namespace std;

#define INF 1010001000
#define EPS 1e-10
#define rep(i, N) for (int i = 0; i < N; i++)
#define pb push_back

typedef pair<int, int> i_i;
typedef long long int llong;
typedef pair<llong, llong> ll_ll;
typedef struct edge {int f, t;}Edge;


int main()
{
    int k, s;
    cin >> k >> s;
    llong ret = 0;
    for (int i = 0; i <= k; i++) {
        for (int j = 0; j <= k; j++) {
            for (int l = 0; l <= k; l++) {
                if (i + j + l == s) {
                    ret++;
                }
            }
        }
    }
    cout << ret << endl;


    return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:42:14: error: expected '}' at end of input
   42 |     return 0;
      |              ^
a.cc:26:1: note: to match this '{'
   26 | {
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int (i)=(0);(i)<=(int)(n);++(i))

int main() {
    int K, S: cin >> K >> S;
    long long ans=0;
    rep(i,K) rep(j,K) rep(k,K) {
        if (i+j+k == S) ans++;
    }
    cout<<ans<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: found ':' in nested-name-specifier, expected '::'
    6 |     int K, S: cin >> K >> S;
      |             ^
      |             ::
a.cc:6:12: error: 'S' has not been declared
    6 |     int K, S: cin >> K >> S;
      |            ^
a.cc:6:19: error: qualified-id in declaration before '>>' token
    6 |     int K, S: cin >> K >> S;
      |                   ^~
a.cc:9:22: error: 'S' was not declared in this scope
    9 |         if (i+j+k == S) ans++;
      |                      ^
Language: Java

import java.util.*;
import java.io.*;


public class HelloWorld{

     public static void main(String []args){
        Scanner scanner = new Scanner(System.in);
        int sx = scanner.nextInt();
        int sy =scanner.nextInt();
        int tx = scanner.nextInt();
        int ty =scanner.nextInt();
   
        
        int y = ty- sy;
        int x = tx - sx;
        
        for(int i=0;i<y;i++)
         System.out.print("U");
        
        for(int i=0;i<x;i++)
        System.out.print("R");
        
         for(int i=0;i<y;i++)
         System.out.print("D");
        
        for(int i=0;i<=x;i++)
        System.out.print("L");
        
        for(int i=0;i<=y;i++)
         System.out.print("U");
        
        for(int i=0;i<=x;i++)
        System.out.print("R");
        
         System.out.print("D");
        
        
         System.out.print("R");
         
           for(int i=0;i<=y;i++)
         System.out.print("D");
         
          for(int i=0;i<=x;i++)
        System.out.print("L");
        
        
        System.out.print("U");
        
        
        
     }
}

Compiler output:
Main.java:5: error: class HelloWorld is public, should be declared in a file named HelloWorld.java
public class HelloWorld{
       ^
1 error
Language: C++

#include<iostream>
using namespace std;
int main(){
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >> ty;
  int i;
  for(i=0;i<tx-sx;i++)cout << 'R';
  for(i=0;i<ty-sy;i++)cout << 'U';
  for(i=0;i<tx-sx;i++)cout << 'L';
  for(i=0;i<ty-sy;i++)cout << 'D';
  cout << 'D';
  for(i=0;i<tx-sx+1;i++)cout << 'R';
  for(i=0;i<ty-sy+1;i++)cout << 'U';
  cout << "LU";
  for(i=0;i<tx-sx+1;i++)cout << 'L';
  for(i=0;i<ty-sy+1;i++)cout << 'D';
  cout << 'R' << endl;
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:18:12: error: expected '}' at end of input
   18 |   return 0;
      |            ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: Java

import java.util.*;

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();
    
    int x = tx - sx;
    int y = ty - sy;
    for (int j = 1; j <= 2; i++) {
      for (int i = 1; i <= x; i++) {
        System.out.print("R");
      }
      for (int i = 1; i <= y; i++) {
        System.out.print("U");
      }
      for (int i = 1; i <= x; i++) {
        System.out.print("L");
      }
      for (int i = 1; i <= y; i++) {
        System.out.print("D");
      }
    }
  }
}

Compiler output:
Main.java:14: error: cannot find symbol
    for (int j = 1; j <= 2; i++) {
                            ^
  symbol:   variable i
  location: class Main
1 error
Language: C++

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 5e4+5;

const int mod = 1e9+7;

//R , L , D , U
string dr = "RLDU";
int dx[]{1 , -1 , 0 , 0};
int dy[]{0 , 0 , -1 , 1};

int sx , sy;
int tx , ty;
string ans = "";
bool vis[N][N];
bool act[N][N];
pair < int , int > from[N][N];
char is[N][N];


void bfs(int a , int b , int c , int d){
    for(int i = 0; i < N; i++)
        for(int j = 0; j < N; j++){
            from[i][j] = {0 , 0};
        }
    bool reach;
    memset(vis , 0 , sizeof vis);
    queue < pair < int , int > > q;
    q.push({a , b});
    while(q.size()){
        int x = q.front().first;
        int y = q.front().second;
        q.pop();
        if(x == c && y == d){
            break;
        }
        vis[x][y] = 1;
        for(int d = 0; d < 4; d++){
            int X = dx[d] + x;
            int Y = dy[d] + y;
            if(!vis[X][Y] && !act[X][Y] && X >= 0 && Y >= 0){
                    from[X][Y].first = x;
                    from[X][Y].second = y;
                    is[X][Y] = dr[d];
                    vis[X][Y] = 1;
                    q.push({X , Y});
            }
        }
    }
    string cur;
    int X = c , Y = d;
    while(abs(X - a) + abs(Y - b) != 0){
        cur = is[X][Y] + cur;
        act[X][Y] = 1;
        pair < int , int > p = from[X][Y];
        X = p.first;
        Y = p.second;
    }
    act[a][b] = 0;
    act[c][d] = 0;
    ans += cur;
    //system("PAUSE");
}

int main() {
    scanf("%d%d%d%d" , &sx , &sy , &tx , &ty);
    sx += 1e3;
    sy += 1e3;
    tx += 1e3;
    ty += 1e3;
    bfs(sx , sy , tx , ty);
    bfs(tx , ty , sx , sy);
    bfs(sx , sy , tx , ty);
    bfs(tx , ty , sx , sy);
    printf("%s\n" , ans.c_str());
    return 0;
}


Compiler output:
/tmp/cc2mnSYL.o: in function `bfs(int, int, int, int)':
a.cc:(.text+0x7b): relocation truncated to fit: R_X86_64_PC32 against symbol `from' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x223): relocation truncated to fit: R_X86_64_PC32 against symbol `act' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x27a): relocation truncated to fit: R_X86_64_PC32 against symbol `from' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x2aa): relocation truncated to fit: R_X86_64_PC32 against symbol `from' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x2ed): relocation truncated to fit: R_X86_64_PC32 against symbol `is' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x3bd): relocation truncated to fit: R_X86_64_PC32 against symbol `is' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x419): relocation truncated to fit: R_X86_64_PC32 against symbol `act' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x443): relocation truncated to fit: R_X86_64_PC32 against symbol `from' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x4b2): relocation truncated to fit: R_X86_64_PC32 against symbol `act' defined in .bss section in /tmp/cc2mnSYL.o
a.cc:(.text+0x4da): relocation truncated to fit: R_X86_64_PC32 against symbol `act' defined in .bss section in /tmp/cc2mnSYL.o
collect2: error: ld returned 1 exit status
Language: C++

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

int main() {
  int sx, sy, tx, ty;
  cin >> sx >> sy >> tx >> ty;
  
  
  int dx = tx - sx; dy = ty - sy;
  for (int i = 0; i < dy; i++) {
    cout << "U";
  }
  for (int i = 0; i < dx; i++) {
    cout << "R";
  }
  
  for (int i = 0; i < dy; i++) {
    cout << "D";
  }
  for (int i = 0; i < dx+1; i++) {
    cout << "L";
  }
  
  
  for (int i = 0; i < dy + 1; i++) {
    cout << "U";
  }
  
  for (int i = 0; i < dx + 1; i++) {
    cout << "R";
  }
  cout << "DR"; 
  for (int i = 0; i < dy + 1; i++) {
    cout << "D";
  }
  
  for (int i = 0; i < dx + 1; i++) {
    cout << "L";
  }
  cout << "U" << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: 'dy' was not declared in this scope; did you mean 'dx'?
    9 |   int dx = tx - sx; dy = ty - sy;
      |                     ^~
      |                     dx
Language: C++

#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<cmath>
#include<bitset>
#include<deque>
#include<functional>
#include<iterator>
#include<map>
#include<set>
#include<stack>
#include<queue>
#include<utility>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
#define a first
#define b second
#define sz(x) (ll)((x).size())
#define pb push_back
#define mp make_pair
#define bg begin()
#define ed end()
#define all(x) (x).bg,(x).ed
#define rep(i,n) for(ll i=0;i<(n);i++)
#define rep1(i,n) for(ll i=1;i<=(n);i++)
#define rrep(i,n) for(ll i=(n)-1;i>=0;i--)
#define rrep1(i,n) for(ll i=(n);i>=1;i--)
#define FOR(i,a,b) for(ll i=(a);i<(b);i++)
const ll MOD=1000000007;
const ll INF=1000000000000000;
template<class T> inline bool chmin(T& a, T b){if(a>b){a=b;return true;}return false;}
template<class T> inline bool chmax(T& a, T b){if(a<b){a=b;return true;}return false;}
ll maxx(ll x,ll y,ll z){return max(max(x,y),z);}
ll minn(ll x,ll y,ll z){return min(min(x,y),z);}
ll gcd(ll x,ll y){if(x%y==0) return y;else return gcd(y,x%y);}
ll lcm(ll x,ll y){return x*(y/gcd(x,y));}
ll digsz(ll x){if(x==0) return 1;else{ll ans=0;while(x){x/=10;ans++;}return ans;}}
ll digsum(ll x){ll sum=0;while(x){sum+=x%10;x/=10;}return sum;}
vector<ll> pw2(62,1);vector<ll> pw10(19,1);


int main(){
    {rep1(i,61) pw2[i]=2*pw2[i-1];}
    {rep1(i,18) pw10[i]=10*pw10[i-1];}
    
    ll sz,sy,tx,ty; cin>>sx>>sy>>tx>>ty;
    ll X=tx-sx,Y=ty-sy;
    rep(i,Y) cout<<'U';
    rep(i,X) cout<<'R';
    rep(i,Y) cout<<'D';
    rep(i,X) cout<<'L';
    cout<<'L';
    rep(i,Y+1) cout<<'U';
    rep(i,X+1) cout<<'R';
    cout<<'D';
    cout<<'R';
    rep(i,Y+1) cout<<'D';
    rep(i,X+1) cout<<'L';
    cout<<'U';
}



Compiler output:
a.cc: In function 'int main()':
a.cc:48:26: error: 'sx' was not declared in this scope; did you mean 'tx'?
   48 |     ll sz,sy,tx,ty; cin>>sx>>sy>>tx>>ty;
      |                          ^~
      |                          tx
a.cc:50:11: error: 'Y' was not declared in this scope
   50 |     rep(i,Y) cout<<'U';
      |           ^
a.cc:26:32: note: in definition of macro 'rep'
   26 | #define rep(i,n) for(ll i=0;i<(n);i++)
      |                                ^
a.cc:52:11: error: 'Y' was not declared in this scope
   52 |     rep(i,Y) cout<<'D';
      |           ^
a.cc:26:32: note: in definition of macro 'rep'
   26 | #define rep(i,n) for(ll i=0;i<(n);i++)
      |                                ^
a.cc:55:11: error: 'Y' was not declared in this scope
   55 |     rep(i,Y+1) cout<<'U';
      |           ^
a.cc:26:32: note: in definition of macro 'rep'
   26 | #define rep(i,n) for(ll i=0;i<(n);i++)
      |                                ^
a.cc:59:11: error: 'Y' was not declared in this scope
   59 |     rep(i,Y+1) cout<<'D';
      |           ^
a.cc:26:32: note: in definition of macro 'rep'
   26 | #define rep(i,n) for(ll i=0;i<(n);i++)
      |                                ^
Language: C++


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: In function 'int main()':
a.cc:4:2: error: 'cin' was not declared in this scope
    4 |  cin >> sx >> sy >> tx >> ty;
      |  ^~~
a.cc:9:2: error: 'cout' was not declared in this scope
    9 |  cout << string(dy,"U") << string(dx,"R");
      |  ^~~~
a.cc:9:10: error: 'string' was not declared in this scope
    9 |  cout << string(dy,"U") << string(dx,"R");
      |          ^~~~~~
a.cc:21:10: error: 'endl' was not declared in this scope
   21 |  cout << endl;
      |          ^~~~
Language: C++

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: In function 'int main()':
a.cc:3:2: error: 'cin' was not declared in this scope
    3 |  cin >> sx >> sy >> tx >> ty;
      |  ^~~
a.cc:8:2: error: 'cout' was not declared in this scope
    8 |  cout << string(dy,"U") << string(dx,"R");
      |  ^~~~
a.cc:8:10: error: 'string' was not declared in this scope
    8 |  cout << string(dy,"U") << string(dx,"R");
      |          ^~~~~~
a.cc:20:10: error: 'endl' was not declared in this scope
   20 |  cout << endl;
      |          ^~~~
Language: C++

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

int maiin()
{
    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 << "D";
    for (int i = 0; i < tx - sx; i++)cout << "L";
    for (int i = 0; i < ty - sy; i++)cout << "U";

    cout << "U";
    for (int i = 0; i < tx - sx + 1; i++)cout << "R";
    for (int i = 0; i < ty - sy + 1; i++)cout << "D";
    cout << "LD";
    for (int i = 0; i < tx - sx + 1; i++)cout << "L";
    for (int i = 0; i < ty - sy + 1; i++)cout << "U";
    cout << "R";
}

Compiler output:
a.cc: In function 'int maiin()':
a.cc:21:1: warning: no return statement in function returning non-void [-Wreturn-type]
   21 | }
      | ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <iostream>
#include <vector>
#include <cmath>
#include <iomanip>
#include <algorithm>
#include <queue>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define all(x) (x).begin(), (x).end()

int main() {
    int sx,sy,tx,ty;
    cin>>sx>>sy>>tx>>ty;
    int u,r;
    u=ty-sy;
    r=tx-sx;
    rep(i,u)cout<<'U';
    rep(i,r)cout<<'R';
    rep(i,u)cout<<'D';
    rep(i,r+1)cout<<'L';
    rep(i,u+1)cout<<'U';
    rep(i,r+1)cout<<'R';
    cout<<'D'<<'R';
    rep(i,d+1)cout<<'D';
    rep(i,r+1)cout<<'L';
    cout<<'U';
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:11: error: 'd' was not declared in this scope
   24 |     rep(i,d+1)cout<<'D';
      |           ^
a.cc:8:34: note: in definition of macro 'rep'
    8 | #define rep(i,n) for(int i=0; i<(n); i++)
      |                                  ^
Language: C++

|| oj test -c ./app
|| [!] update available: 7.6.0 -> 10.0.3
|| [*] run: $ pip3 install -U online-judge-tools
|| [*] see: https://github.com/kmyk/online-judge-tools/blob/master/CHANGELOG.md
|| [*] 4 cases found
|| 
|| [*] sample-1
|| [x] time: 0.011114 sec
|| [-] WA
|| output:
|| UUUUUUUUUUDDDDDDDDDDUUUUUUUUUUUDRDDDDDDDDDDDU
|| 
|| expected:
|| 9
|| 
|| 
|| [*] sample-2
|| [x] time: 0.010931 sec
|| [-] WA
|| output:
|| UUUUUDDDDDUUUUUUDRDDDDDDU
|| 
|| expected:
|| 6
|| 
|| 
|| [*] sample-3


Compiler output:
a.cc:2:26: error: too many decimal points in number
    2 | || [!] update available: 7.6.0 -> 10.0.3
      |                          ^~~~~
a.cc:2:35: error: too many decimal points in number
    2 | || [!] update available: 7.6.0 -> 10.0.3
      |                                   ^~~~~~
a.cc:1:1: error: expected unqualified-id before '||' token
    1 | || oj test -c ./app
      | ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int64_t MOD=1000000007;

int main() {
  int a,b,x,y;
  cin>>a>>b>>x>>y;
  x-=a;
  y-=b;
  rep(i,x) coyt<<"R";
  rep(i,y) cout<<"U";
  rep(i,x) cout<<"L";
  rep(i,y+1) cout<<"D";
  rep(i,x+1) cout<<"R";
  rep(i,y+1) cout<<"U";
  cout<<"LU";
  rep(i,x+1) cout<<"L";
  rep(i,y+1) cout<<"D";
  cout<<"R";
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: 'coyt' was not declared in this scope
   11 |   rep(i,x) coyt<<"R";
      |            ^~~~
Language: Java

import java.util.*;
public class Main {
  	public static int verticalSide;
  	public static int holizonticalSide;
  
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int sx = sc.nextInt();
		int sy = sc.nextInt();
		int tx = sc.nextInt();
      	int ty = sc.nextInt();
      
      	// 答えをここに入れていくよ
      	List<String> ansList = new ArrayList<>(); 
 
      	// 縦の辺の長さ
      	verticalSide = tx - sx;
      	// 横の辺の長さ
      	holizonticalSide = ty - sy;
      
      	// 1往復目＿行き
      	shortest(ansList, "R", "U");
      
      	// 1往復目＿帰り
      	ansList.add("R");
      	verticalMove(ansList, "D");
      	ansList.add("D");
      	ansList.add("L");
      	holizonticalMove(ansList, "L");
      	ansList.add("U");
      
      	// 2往復目＿行き
      	ansList.add("L");
      	verticalMove(ansList, "U");
      	ansList.add("U");
      	ansList.add("R");
      	holizonticalMove(ansList, "R");
      	ansList.add("D");
      
      	// 2往復目＿帰り
      	shortest(ansList, "L", "U");
      
      	// 出力
		System.out.println(ansList);
	}
      
    // 最短で行く場合の道のり
   	private static void shortest(List<String> ansList, String horizonticalChar, String verticalChar){
    	// 長方形の横の辺上を移動する
		holizonticalMove(ansList, horizonticalChar);
        // 長方形の縦の辺上を移動する
       	verticalMove(ansList, verticalChar);
    }
      
    // 長方形の横の辺上を移動する
    private void holizonticalMove(List<String> ansList, String horizonticalChar){
        for(int i = 0; i < holizonticalSide ; i++){
        	ansList.add(horizonticalChar);
       	}
  	}
      
  	// 長方形の縦の辺上を移動する
   	private void verticalMove(List<String> ansList, String verticalChar){
    	for(int i = 0; i < verticalSide ; i++){
       		ansList.add(verticalChar);
     	}
  	}

      	
      	

}

Compiler output:
Main.java:27: error: non-static method verticalMove(List<String>,String) cannot be referenced from a static context
      	verticalMove(ansList, "D");
      	^
Main.java:30: error: non-static method holizonticalMove(List<String>,String) cannot be referenced from a static context
      	holizonticalMove(ansList, "L");
      	^
Main.java:35: error: non-static method verticalMove(List<String>,String) cannot be referenced from a static context
      	verticalMove(ansList, "U");
      	^
Main.java:38: error: non-static method holizonticalMove(List<String>,String) cannot be referenced from a static context
      	holizonticalMove(ansList, "R");
      	^
Main.java:51: error: non-static method holizonticalMove(List<String>,String) cannot be referenced from a static context
		holizonticalMove(ansList, horizonticalChar);
		^
Main.java:53: error: non-static method verticalMove(List<String>,String) cannot be referenced from a static context
       	verticalMove(ansList, verticalChar);
       	^
6 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
    int A,B,C,D;
    cin >> A >> B >> C >> D;
    for(int i = 0; i < C-A; i++) {
        cout << 'U';
    }
    for(int i = 0; i < D-B; i++) {
        cout << 'R';
    }
    for(int i = 0; i < D-B+1; i++) {
        cout << 'L';
    }
    for(int i = 0; i < C-A+1: i++) {
        cout << 'D';
    }
    for(int i = 0; i < C-A; i++) {
        cout << 'R';
    }
    for(int i = 0; i < D-B; i++) {
        cout << 'U';
    }
    for(int i = 0; i < D-B+1; i++) {
        cout << 'D';
    }
    for(int i = 0; i < C-A+1: i++) {
        cout << 'L';
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:20: warning: range-based 'for' loops with initializer only available with '-std=c++20' or '-std=gnu++20' [-Wc++20-extensions]
   15 |     for(int i = 0; i < C-A+1: i++) {
      |                    ^
a.cc:15:29: error: expected ';' before ':' token
   15 |     for(int i = 0; i < C-A+1: i++) {
      |                             ^
      |                             ;
a.cc:18:5: error: expected primary-expression before 'for'
   18 |     for(int i = 0; i < C-A; i++) {
      |     ^~~
a.cc:17:6: error: expected ';' before 'for'
   17 |     }
      |      ^
      |      ;
   18 |     for(int i = 0; i < C-A; i++) {
      |     ~~~
a.cc:18:5: error: expected primary-expression before 'for'
   18 |     for(int i = 0; i < C-A; i++) {
      |     ^~~
a.cc:17:6: error: expected ')' before 'for'
   17 |     }
      |      ^
      |      )
   18 |     for(int i = 0; i < C-A; i++) {
      |     ~~~
a.cc:15:8: note: to match this '('
   15 |     for(int i = 0; i < C-A+1: i++) {
      |        ^
a.cc:27:20: warning: range-based 'for' loops with initializer only available with '-std=c++20' or '-std=gnu++20' [-Wc++20-extensions]
   27 |     for(int i = 0; i < C-A+1: i++) {
      |                    ^
a.cc:27:29: error: expected ';' before ':' token
   27 |     for(int i = 0; i < C-A+1: i++) {
      |                             ^
      |                             ;
a.cc:30:1: error: expected primary-expression before '}' token
   30 | }
      | ^
a.cc:29:6: error: expected ';' before '}' token
   29 |     }
      |      ^
      |      ;
   30 | }
      | ~     
a.cc:30:1: error: expected primary-expression before '}' token
   30 | }
      | ^
a.cc:29:6: error: expected ')' before '}' token
   29 |     }
      |      ^
      |      )
   30 | }
      | ~     
a.cc:27:8: note: to match this '('
   27 |     for(int i = 0; i < C-A+1: i++) {
      |        ^
a.cc:30:1: error: expected primary-expression before '}' token
   30 | }
      | ^
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int sx = sc.nextInt();
		int sy = sc.nextInt();
		int tx = sc.nextInt();
      	int ty = sc.nextInt();

      	String first = 
      	
		// 出力
		System.out.println((a+b+c) + " " + s);
	}
}

Compiler output:
Main.java:14: error: cannot find symbol
		System.out.println((a+b+c) + " " + s);
		                    ^
  symbol:   variable a
  location: class Main
Main.java:14: error: cannot find symbol
		System.out.println((a+b+c) + " " + s);
		                      ^
  symbol:   variable b
  location: class Main
Main.java:14: error: cannot find symbol
		System.out.println((a+b+c) + " " + s);
		                        ^
  symbol:   variable c
  location: class Main
Main.java:14: error: cannot find symbol
		System.out.println((a+b+c) + " " + s);
		                                   ^
  symbol:   variable s
  location: class Main
4 errors
Language: C++

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

typedef long long ll;
#define vec vector<int>
#define vecll vector<ll>
#define rep(i,n)   for(int i=(int)0; i<(int)n; i++)
#define llrep(i,n)   for(ll i=(ll)0; i<(ll)n; i++)
#define REP(i,m,n) for(int i=(int)m; i<(int)n; i++)
#define prt_dbl(i,var) cout<<fixed<<setprecision(i)<<var<<endl;
#define dpair pair<double,double>

template <typename Val>
Val gcd(Val a, Val b) {
//use ll or int for gcd
    if (b==0) return a;
    else return gcd(b, a%b);
}
template <typename Val>
Val vec_max(vector<Val> v){
  return *max_element(v.begin(),v.end());
}
template <typename Val>
Val vec_min(vector<Val> v){
  return *min_element(v.begin(),v.end());
}
template <typename Val>
void show_vec(vector<Val> *v){
  cout<<endl;
  rep(i,v->size()){
    cout<<v->at(i)<<" ";
  }
  cout<<endl;
}

template <typename Val,typename Number>
void count_vector(vector<Val>* A,vector<pair<Number,Val>>*R){
  sort(A->begin(),A->end());
  int count = 1;
  rep(i,A->size()){
    if(i<A->size()-1){
      if(A->at(i)==A->at(i+1))count++;
      else{
        R->emplace_back(count,A->at(i));
        count = 1;
      }
    }else{
      R->emplace_back(count,A->at(i));
    }
  }
}





//---------------------------------------------------------------
int main(){
  Point s;
  Point t;
  string ans;
  cin>>s.x>>s.y>>t.x>>t.y;
  int step_x = - s.x + t.x;
  int step_y = - s.y + t.y;
  rep(i,step_y){
    ans.push_back('U');
  }
  rep(i,step_x){
    ans.push_back('R');
  }

  rep(i,step_y){
    ans.push_back('B');
  }
  rep(i,step_x){
    ans.push_back('L');
  }
  ans.push_back('L');
  rep(i,step_y+1){
    ans.push_back('U');
  }
  rep(i,step_x+1){
    ans.push_back('R');
  }
  ans.push_back('B');
  ans.push_back('R');
  rep(i,step_y+1){
    ans.push_back('B');
  }
  rep(i,step_x+1){
    ans.push_back('L');
  }
  ans.push_back('U');







  cout<<ans<<endl;





}


Compiler output:
a.cc: In function 'int main()':
a.cc:60:3: error: 'Point' was not declared in this scope
   60 |   Point s;
      |   ^~~~~
a.cc:61:8: error: expected ';' before 't'
   61 |   Point t;
      |        ^~
      |        ;
a.cc:63:8: error: 's' was not declared in this scope
   63 |   cin>>s.x>>s.y>>t.x>>t.y;
      |        ^
a.cc:63:18: error: 't' was not declared in this scope; did you mean 'tm'?
   63 |   cin>>s.x>>s.y>>t.x>>t.y;
      |                  ^
      |                  tm
Language: C++

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

ll main(){

  ll sx,sy,tx,ty;
  cin >>sx>>sy>>tx>>ty;
  string s;

  for (ll i = 0; i < ty-sy; i++) {
    s.push_back('U');
  }

  for (ll i = 0; i < tx-sx; i++) {
    s.push_back('R');
  }

  for (ll i = 0; i < ty-sy; i++) {
    s.push_back('D');
  }

  for (ll i = 0; i <= tx-sx; i++) {
    s.push_back('L');
  }

  for (ll i = 0; i <= ty-sy; i++) {
    s.push_back('U');
  }

  for (ll i = 0; i <= tx-sx; i++) {
    s.push_back('R');
  }

  s.push_back('D');
  s.push_back('R');

  for (ll i = 0; i <= tx-sx; i++) {
    s.push_back('D');
  }

  for (ll i = 0; i <= tx-sx; i++) {
    s.push_back('L');
  }

  s.push_back('U');


  cout << s << endl;
}


Compiler output:
a.cc:5:1: error: '::main' must return 'int'
    5 | ll main(){
      | ^~
Language: C++

# back and force
ln = list(map(int, input().split(' ')))
disX = ln[2] - ln[0]
disY = ln[3] - ln[1]
output=''
u='U'
d='D'
r='R'
l='L'
#　一周め
for i in range(disY):
    output+= u
for i in range(disX):
    output+= r
for i in range(disY):
    output+= d
for i in range(disX):
    output+= l
#2週め
output+= l+u
for i in range(disY):
    output+= u
for i in range(disX):
    output+= r
output+= r+d +r+d
for i in range(disY):
    output+= d
for i in range(disX):
    output+= l
output+= l+u
print(output)

Compiler output:
a.cc:1:3: error: invalid preprocessing directive #back
    1 | # back and force
      |   ^~~~
a.cc:5:8: error: empty character constant
    5 | output=''
      |        ^~
a.cc:10:2: error: extended character 　 is not valid in an identifier
   10 | #　一周め
      |  ^
a.cc:10:2: error: invalid preprocessing directive #\U00003000\U00004e00\U00005468\U00003081
   10 | #　一周め
      |  ^~~~~~~~
a.cc:19:2: error: "2週め" after # is not a positive integer
   19 | #2週め
      |  ^~~~~
a.cc:2:1: error: 'ln' does not name a type; did you mean 'long'?
    2 | ln = list(map(int, input().split(' ')))
      | ^~
      | long
Language: C++

 int hori = abs(sx-tx);
    string ans = "";
    adder(ans,verti,'U');
    adder(ans,hori,'R');
    adder(ans,verti,'D');
    adder(ans,hori,'L');
    adder(ans,1,'L');
    adder(ans,verti+1,'U');
    adder(ans,hori+1,'R');
    adder(ans,1,'D');
    adder(ans,1,'R');
    adder(ans,verti+1,'D');
    adder(ans,hori+1,'L');
    adder(ans,1,'U');
    cout<<ans<<endl;

Compiler output:
a.cc:1:17: error: 'sx' was not declared in this scope
    1 |  int hori = abs(sx-tx);
      |                 ^~
a.cc:1:20: error: 'tx' was not declared in this scope
    1 |  int hori = abs(sx-tx);
      |                    ^~
a.cc:1:13: error: 'abs' was not declared in this scope
    1 |  int hori = abs(sx-tx);
      |             ^~~
a.cc:2:5: error: 'string' does not name a type
    2 |     string ans = "";
      |     ^~~~~~
a.cc:3:10: error: expected constructor, destructor, or type conversion before '(' token
    3 |     adder(ans,verti,'U');
      |          ^
a.cc:4:10: error: expected constructor, destructor, or type conversion before '(' token
    4 |     adder(ans,hori,'R');
      |          ^
a.cc:5:10: error: expected constructor, destructor, or type conversion before '(' token
    5 |     adder(ans,verti,'D');
      |          ^
a.cc:6:10: error: expected constructor, destructor, or type conversion before '(' token
    6 |     adder(ans,hori,'L');
      |          ^
a.cc:7:10: error: expected constructor, destructor, or type conversion before '(' token
    7 |     adder(ans,1,'L');
      |          ^
a.cc:8:10: error: expected constructor, destructor, or type conversion before '(' token
    8 |     adder(ans,verti+1,'U');
      |          ^
a.cc:9:10: error: expected constructor, destructor, or type conversion before '(' token
    9 |     adder(ans,hori+1,'R');
      |          ^
a.cc:10:10: error: expected constructor, destructor, or type conversion before '(' token
   10 |     adder(ans,1,'D');
      |          ^
a.cc:11:10: error: expected constructor, destructor, or type conversion before '(' token
   11 |     adder(ans,1,'R');
      |          ^
a.cc:12:10: error: expected constructor, destructor, or type conversion before '(' token
   12 |     adder(ans,verti+1,'D');
      |          ^
a.cc:13:10: error: expected constructor, destructor, or type conversion before '(' token
   13 |     adder(ans,hori+1,'L');
      |          ^
a.cc:14:10: error: expected constructor, destructor, or type conversion before '(' token
   14 |     adder(ans,1,'U');
      |          ^
a.cc:15:5: error: 'cout' does not name a type
   15 |     cout<<ans<<endl;
      |     ^~~~
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+1);i++)
    cout<<"D";
  for(int i=0;i<(tx-sx+1);i++)
    cout<<"R";
  for(int i=0;i<(ty-sy+1);i++)
    cout<<"U";
  cout<<"L";
  cout<<"U";
  for(int i=0;i<(tx-sx+1);i++)
    cout<<"L";
  for(int i=0;i<(ty-sy+1);i++)
    cout<<"D";
  cout<<"R"<<endl;

   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:28: error: expected ';' before ')' token
    6 |   for(int i=0<i<(tx-sx);i++)
      |                            ^
      |                            ;
Language: C++

sx, sy, tx, ty = gets.split.map(&:to_i)
a = tx - sx
b = ty - sy
print "U" * b + "R" * a
print "D" * b + "L" * a
print "L" + "U" * (b + 1) + "R" * (a + 1) + "D"
print "R" + "D" * (b + 1) + "L" * (a + 1) + "U" + "\n"

Compiler output:
a.cc:1:1: error: 'sx' does not name a type
    1 | sx, sy, tx, ty = gets.split.map(&:to_i)
      | ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define FOR(i,l,r) for(i=l;i<r;i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(x) x.begin(),x.end()
#define P pair<ll,ll>
#define F first
#define S second
signed main(){
  ll sx,sy,X,Y,i;
  cin>>sx>>sy>>X>>Y;
  X-=sx;Y-=sy
  REP(i,X)cout<<'R';
  REP(i,Y)cout<<'U';
  REP(i,X)cout<<'L';
  REP(i,Y+1)cout<<'D';
  REP(i,X+1)cout<<'R';
  REP(i,Y+1)cout<<'U';
  cout<<"LU";
  REP(i,X+1)cout<<'L';
  REP(i,Y+1)cout<<'D';
  cout<<'R'<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:14: error: expected ';' before 'for'
   13 |   X-=sx;Y-=sy
      |              ^
      |              ;
a.cc:4:35: error: expected ';' before ')' token
    4 | #define FOR(i,l,r) for(i=l;i<r;i++)
      |                                   ^
a.cc:5:18: note: in expansion of macro 'FOR'
    5 | #define REP(i,n) FOR(i,0,n)
      |                  ^~~
a.cc:14:3: note: in expansion of macro 'REP'
   14 |   REP(i,X)cout<<'R';
      |   ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
    int sx,sy,gx,gy;
    cin >> sx >> sy >> gx >> gy;
    vector<char> a;
   for(int i = sx - gx; i != 0; (sx > gx ? i-- : i++)){
       a.emplace_back(sx > gx ? 'L' : 'R');
       if(sx > gx)
       a.emplace_back('L');
       else if(sx < gx)
       a.emplace_back('R');
   }
   for(int i = sy - gy; i != 0; (sy > gy ? i-- : i++)){
       if(sy > gy)
       a.emplace_back('D');
       else if(sy < gy)
       a.emplace_back('U');
   }
   for(int i = sx - gx; i != 0; (sx > gx ? i-- : i++)){
       a.emplace_back(sx > gx ? 'L' : 'R');
       if(sx > gx)
       a.emplace_back('R');
       else if(sx < gx)
       a.emplace_back('L');
   }
   for(int i = sy - gy; i != 0; (sy > gy ? i-- : i++)){
       if(sy > gy)
       a.emplace_back('U');
       else if(sy < gy)
       a.emplace_back('D');
   }
   if(sx > gx)
    a.emplace_back('R');
    else if (sx < gx){
        a.emplace_back('L');
    }
    for(int i = abs(sy - gy) + 1; i > 0; i--){
        if(sy  < gy)
        a.emplace_back('U');
        else if(sy > gy)
        a.emplace_back('D');
    }
    for(int i = abs(sx - gx) + 1; i > 0; i--){
        if(sx < gx)
        a.emplace_back('R');
        else if(sy > gy)
        a.emplace_back('L');
    } 
    if(sy > gy)
    a.emplace_back('U');
    else if(sy < gy)
    a.emplace_back('D');
    if(sx > gx)
    a.emplace_back('L')
    else if(sx < gx)
    a.emplace_back('R');
    for(int i = abs(sy - gy) + 1; i > 0; i--){
        if(sy  < gy)
        a.emplace_back('D');
        else if(sy > gy)
        a.emplace_back('U');
    }
    for(int i = abs(sx - gx) + 1; i > 0; i--){
        if(sx < gx)
        a.emplace_back('L');
        else if(sy > gy)
        a.emplace_back('R');
    }
    if(sy > gy)
    a.emplace_back('D');
    else if(sy < gy)
    a.emplace_back('U');

    for(int i = 0; i < a.size(); i++){
        cout << a[i];
    }
    cout << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:56:24: error: expected ';' before 'else'
   56 |     a.emplace_back('L')
      |                        ^
      |                        ;
   57 |     else if(sx < gx)
      |     ~~~~
Language: C++

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;

template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}

const ll INF=1e9+7;


int main()
{
    ll sx,sy,tx,ty;
    cin >> sx >> sy >> tx >> ty;
    ll h=ty-sy;
    ll w=tx-sx;
    rep(i,h){
        cout << 'U';
    }
    rep(i,w){
        cout << 'R';
    }
    rep(i,h){
        cout << 'D';
    }
    rep(i,w){
        cout << 'L';
    }
    cout << 'L';
    rep(i,h+1){
        cout << 'U';
    }
    rep(i,w+1){
        cout << 'R';
    }
    cout << 'D' << 'R';
    rep(i,h+1){
        cout << 'D';
    }
    rep(i,w+1){
        cout << 'L'
    }
    cout << 'U' << endl;
    return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:53:20: error: expected ';' before '}' token
   53 |         cout << 'L'
      |                    ^
      |                    ;
   54 |     }
      |     ~
Language: C++

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;

template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}

const ll INF=1e9+7;


int main()
{
    ll sx,sy,tx,ty;
    cin >> sx >> sy >> tx >> ty;
    ll h=ty-sy;
    ll w=tx-sx;
    rep(i,h){
        cout << 'U';
    }
    reo(i,w){
        cout << 'R';
    }
    rep(i,h){
        cout << 'D';
    }
    rep(i,w){
        cout << 'L';
    }
    cout << 'L';
    rep(i,h+1){
        cout << 'U';
    }
    rep(i,w+1){
        cout << 'R';
    }
    cout << 'D' << 'R';
    rep(i,h+1){
        cout << 'D';
    }
    rep(i,w+1){
        cout << 'L'
    }
    cout << 'U' << endl;
    return 0;
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:32:9: error: 'i' was not declared in this scope
   32 |     reo(i,w){
      |         ^
a.cc:32:5: error: 'reo' was not declared in this scope; did you mean 'rep'?
   32 |     reo(i,w){
      |     ^~~
      |     rep
a.cc:53:20: error: expected ';' before '}' token
   53 |         cout << 'L'
      |                    ^
      |                    ;
   54 |     }
      |     ~