criyle/codenet-compile-errors huggingface dataset:
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);
      |                         ^
a.cc: At global scope:
a.cc:43:5: error: 'y' does not name a type
   43 |     y++;cout << 'U'<<endl;
      |     ^
a.cc:43:9: error: 'cout' does not name a type
   43 |     y++;cout << 'U'<<endl;
      |         ^~~~
a.cc:44:1: error: expected declaration before '}' token
   44 | }
      | ^
Language: C++

#include<iostream>
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"<<endl;
  }
  for(int i=0;<i<ty-sy;i++){
	cout<<"U"<<endl;
  }
    for(int i=0;i<tx-sx;i++){
	cout<<"L"<<endl;
  }
  for(int i=0;i<ty-sy;i++){
	cout<<"D"<<endl;
  }
  cout<<"L"<<endl;
  for(int i=0;i<ty-sy+1;i++){
	cout<<"U"<<endl;
  }
  for(int i=0;i<tx-sx+1;i++){
	cout<<"R"<<endl;
  }
  cout<<"D"<<endl;
  cout<<"R"<<endl;
  for(int i=0;i<ty-sy+1;i++){
	cout<<"D"<<endl;
  }
  for(int i=0;i<tx-sx+1;i++){
	cout<<"L"<<endl;
  }
  cout<<"U"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: expected primary-expression before '<' token
    9 |   for(int i=0;<i<ty-sy;i++){
      |               ^
Language: C++

#include<cstdio>

int main(){
	int sx, sy, tx, tv;
	scanf("%d %d %d %d", &sx, &sy, &tx, &tv);
	tx -= sx, ty -= sy;
	for (int i = 0; i < tx; ++i) printf("R");
	for (int i = 0; i < ty + 1; ++i) printf("U");
	for (int i = 0; i < tx + 1; ++i) printf("L");
	for (int i = 0; i < ty + 1; ++i) printf("D");
	printf("R");
	for (int i = 0; i < ty; ++i) printf("U");
	for (int i = 0; i < tx + 1; ++i) printf("R");
	for (int i = 0; i < ty + 1; ++i) printf("D");
	for (int i = 0; i < tx + 1; ++i) printf("L");
	printf("U\n");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:19: error: 'ty' was not declared in this scope; did you mean 'tv'?
    6 |         tx -= sx, ty -= sy;
      |                   ^~
      |                   tv
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:26:23: error: expected ';' before 'for'
   26 |     cout << 'L' << 'U'
      |                       ^
      |                       ;
   27 |     for(i=0; i<tx-sx; i++){
      |     ~~~                
a.cc:27:26: error: expected ';' before ')' token
   27 |     for(i=0; i<tx-sx; i++){
      |                          ^
      |                          ;
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:29:7: error: expected ';' before string constant
   29 |   cout "LU";
      |       ^~~~~
      |       ;
Language: C++

#include <stdio.h>
#include <bits/stdc++.h>

using namespace std;
#define ll long long
#define ld long double
#define  P pair<ll,ll>
#define FOR(i,n,m) for(ll i=n; i<(ll)m;i++)
#define FORr(i,n,m) for(ll i=n; i>=(ll)m; i--)
#define FORm(i,m) for(auto i=m.begin();i!=m.end();i++)
#define VEC2(x,a,b) vector<vector<ll>> x = vector<vector<ll>>(a,vector<ll>(b,0))
#define sortAl(v) sort(v.begin(),v.end())
#define sortAlr(v) sort(v.begin(),v.end()); reverse(v.begin(),v.end())
#define cinv(v,n,m) FOR(i,n,m) cin>>v.at(i)
#define coutv(v,n,m) FOR(i,n,m) cout<<v.at(i) <<" "; cout<<endl
#define cout(n) cout<<fixed<<setprecision(n)

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll sx,sy,tx,ty;
    cin>>sx>>sy>>tx>>ty;
    ll x = tx-sx;
    ll y = ty-sy;
    FOR(i,0,y){
      cout<<"U";
    }
    FOR(i,0,x){
      cout<<"R";
    }

    FOR(i,0,y){
      cout<<"D";
    }
    FOR(i,0,x){
      cout<<"L";
    }
    cout<<"L";
    FOR(i,0,y+1){
      cout<<"U";
    }
    FOR(i,0,x+1){
      cout<<"R";
    }
    cout<<"DR";
    FOR(i,0,y+1){
      cout<<"D";
    }
    FOR(i,0,x+1){
      cout<<"L";
    }
    cout<<"U"endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:52:11: error: unable to find string literal operator 'operator""endl' with 'const char [2]', 'long unsigned int' arguments
   52 |     cout<<"U"endl;
      |           ^~~~~~~
Language: C

#include <stdio.h>
int main(void){
  int x,y,sx,sy,tx,ty,i;
  x=tx-sx:
  y=ty-sy;
  for(i=0;i<y;i++);
  printf("U");
  for(i=0;i<x;i++);
  printf("R");
  for(i=0;i<y;i++);
  printf("D");
  for(i=0;i<=x;i++);
  printf("L");
  for(i=0;i<=y;i++);
  printf("U");
  for(i=0;i<=x;i++);
    printf("R");
  printf("DR");
  for(i=0;i<=y;i++);
  printf("D");
  for(i=0;i<=x;i++);
  printf("L");
  printf("U");
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:10: error: expected ';' before ':' token
    4 |   x=tx-sx:
      |          ^
      |          ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int sx,sy,tx,ty;
	cin>>sx>>sy>>tx>>ty;
	int y=ty-sy;
	int x=tx-sx;
	for(int i=0;i<y;i++)
	cout<<'U';
	for(int i=0;i<x;i++)
	cout<<'R';
	for(int i=0;i<y;i++)
	cout<<'D';
	for(int i=0;i<x;i++)
	cout<<'L';
	cout<<'L';
	for(int i=0;i<y+1;i++)
	cout<<'U';
	for(int i=0;i<x+1;i++)
	cout<<'R';
	cout<<'D';
	cout<<'R';
	for(int i=0;i<y+1;i++)
	cout<<'D';
	for(int i=0;i<x+10 0 1 2;i++)
	cout<<'L';
	cout<<'U';
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:27: error: expected ';' before numeric constant
   26 |         for(int i=0;i<x+10 0 1 2;i++)
      |                           ^~
      |                           ;
a.cc:26:29: error: expected ')' before numeric constant
   26 |         for(int i=0;i<x+10 0 1 2;i++)
      |            ~                ^~
      |                             )
a.cc:26:31: error: expected ';' before numeric constant
   26 |         for(int i=0;i<x+10 0 1 2;i++)
      |                               ^~
      |                               ;
a.cc:26:34: error: 'i' was not declared in this scope
   26 |         for(int i=0;i<x+10 0 1 2;i++)
      |                                  ^
Language: C++

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



Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: 'ts' was not declared in this scope; did you mean 'ty'?
    6 |         int dx=ts-sx;
      |                ^~
      |                ty
Language: C++

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int main(){
	int i,s1,s2,t1,t2;
	cin>>s1>>s2>>t1>>t2;
	for(i=1;i<=t2-s2;i++)  cout<<"U";
	for(i=1;i<=t1-s1;i++) cout<<"R";
	for(i=1;i<=t2-s2;i++)  cout<<"D";
	for(i=1;i<=t1-s1;i++) cout<<"L";
	cout<<"L";
	for(i=1;i<=t2-s2+1;i++)  cout<<"U";
	for(i=1;i<=t1-s1+1;i++) cout<<"R";
	cout<<"D";
	cout<<"U";
	for(i=1;i<=t2-s2+1;i++)  cout<<"D";
	for(i=1;i<=t1-s1+1;i++) cout<<"L";
	cout<<"R";
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin>>s1>>s2>>t1>>t2;
      |         ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:7:32: error: 'cout' was not declared in this scope
    7 |         for(i=1;i<=t2-s2;i++)  cout<<"U";
      |                                ^~~~
a.cc:7:32: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:8:31: error: 'cout' was not declared in this scope
    8 |         for(i=1;i<=t1-s1;i++) cout<<"R";
      |                               ^~~~
a.cc:8:31: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:9:32: error: 'cout' was not declared in this scope
    9 |         for(i=1;i<=t2-s2;i++)  cout<<"D";
      |                                ^~~~
a.cc:9:32: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:31: error: 'cout' was not declared in this scope
   10 |         for(i=1;i<=t1-s1;i++) cout<<"L";
      |                               ^~~~
a.cc:10:31: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:11:9: error: 'cout' was not declared in this scope
   11 |         cout<<"L";
      |         ^~~~
a.cc:11:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

sx, sy, tx, ty = map(int, input().split())
ans = ""

for i in range(ty-sy):
    ans += "U"
for i in range(tx-sx):
    ans += "R"
for i in range(ty-sy):
    ans += "D"
for i in range(tx-sx):
    ans += "L"
ans += "L"
for i in range(ty-sy+1):
    ans += "U"
for i in range(tx-sx+1):
    ans += "R"
ans += "D"
for i in range(ty-sy+1):
    ans += "D"
for i in range(tx-sx+1):
    ans += "L"
ans += "U"

print(ans)

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

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


  for(int i = sx;i < tx;i++) cout << 'R';
  for(int i = sy;i < ty;i++) cout << 'U';
  for(int i = sx;i < tx;i++) cout << 'L';
  for(int i = sy;i < ty;i++) cout << 'D';
  cout << 'D';
  for(int i = sx;i < tx+1;i++) cout << 'R';
  for(int i = sy;i < ty+1;i++) cout << 'U';
  cout << 'L';
  cout << 'U';
  for(int i = sx;i < tx+1;i++) cout << 'L';
  for(int i = sy;i < ty+1;i++) cout << 'D';
  cout << 'R';
  cout << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'cin' was not declared in this scope
    3 |   cin >> sx >> sy >> tx >> ty;
      |   ^~~
a.cc:6:30: error: 'cout' was not declared in this scope
    6 |   for(int i = sx;i < tx;i++) cout << 'R';
      |                              ^~~~
a.cc:7:30: error: 'cout' was not declared in this scope
    7 |   for(int i = sy;i < ty;i++) cout << 'U';
      |                              ^~~~
a.cc:8:30: error: 'cout' was not declared in this scope
    8 |   for(int i = sx;i < tx;i++) cout << 'L';
      |                              ^~~~
a.cc:9:30: error: 'cout' was not declared in this scope
    9 |   for(int i = sy;i < ty;i++) cout << 'D';
      |                              ^~~~
a.cc:10:3: error: 'cout' was not declared in this scope
   10 |   cout << 'D';
      |   ^~~~
a.cc:18:11: error: 'endl' was not declared in this scope
   18 |   cout << endl;
      |           ^~~~
Language: C

#include<stdio.h>

int main(void){
  int i; //for loop
  int sx,sy,tx,ty; //for input
  int dx,dy; //different
  
  err=scanf("%d",&sx);
  if(err==EOF){return 0;}
  err=scanf("%d",&sy);
  if(err==EOF){return 0;}
  err=scanf("%d",&tx);
  if(err==EOF){return 0;}
  err=scanf("%d",&ty);
  if(err==EOF){return 0;}

  dx=tx-sx;
  dy=ty-sy;
  
  for(i=0;i<dy;i++){printf("U");}
  for(i=0;i<dx;i++){printf("R");}
  for(i=0;i<dy;i++){printf("D");}
  for(i=0;i<dx;i++){printf("L");}
  printf("L");
  for(i=0;i<dy+1;i++){printf("U");}
  for(i=0;i<dx+1;i++){printf("R");}
  printf("D");
  printf("R");
  for(i=0;i<dy+1;i++){printf("D");}
  for(i=0;i<dx+1;i++){printf("L");}
  printf("U\n");

  return 0;  
}


Compiler output:
main.c: In function 'main':
main.c:8:3: error: 'err' undeclared (first use in this function)
    8 |   err=scanf("%d",&sx);
      |   ^~~
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<itdio.h>

int main(void){
  int i; //for loop
  int sx,sy,tx,ty; //for input
  int dx,dy; //different
  
  err=scanf("%d",&sx);
  if(err==EOF){return 0;}
  err=scanf("%d",&sy);
  if(err==EOF){return 0;}
  err=scanf("%d",&tx);
  if(err==EOF){return 0;}
  err=scanf("%d",&ty);
  if(err==EOF){return 0;}

  dx=tx-sx;
  dy=ty-sy;
  
  for(i=0;i<dy;i++){printf("U");}
  for(i=0;i<dx;i++){printf("R");}
  for(i=0;i<dy;i++){printf("D");}
  for(i=0;i<dx;i++){printf("L");}
  printf("L");
  for(i=0;i<dy+1;i++){printf("U");}
  for(i=0;i<dx+1;i++){printf("R");}
  printf("D");
  printf("R");
  for(i=0;i<dy+1;i++){printf("D");}
  for(i=0;i<dx+1;i++){printf("L");}
  printf("U\n");

  return 0;  
}

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

#include<stdio.h>
 
int main(void){
  int i; //for loop
  int sx,sy,tx,ty; //for input
  int dx,dy; //different
  
  err=scanf("%d",&sx);
  err=scanf("%d",&sy);
  err=scanf("%d",&tx);
  err=scanf("%d",&ty);
  if(err==EOF){return 1;}
 
  dx=tx-sx;
  dy=ty-sy;
  
  for(i=0;i<dy;i++){printf("U");}
  for(i=0;i<dx;i++){printf("R");}
  for(i=0;i<dy;i++){printf("D");}
  for(i=0;i<dx;i++){printf("L");}
  printf("L");
  for(i=0;i<dy+1;i++){printf("U");}
  for(i=0;i<dx+1;i++){printf("R");}
  printf("D");
  printf("R");
  for(i=0;i<dy+1;i++){printf("D");}
  for(i=0;i<dx+1;i++){printf("L");}
  printf("U\n");
 
  return 0;  
}

Compiler output:
main.c: In function 'main':
main.c:8:3: error: 'err' undeclared (first use in this function)
    8 |   err=scanf("%d",&sx);
      |   ^~~
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>

int main(void){
  int i; //for loop
  int sx,sy,tx,ty; //for input
  int dx,dy; //different
  
  err=scanf("%d",&sx);
  err=scanf("%d",&sy);
  err=scanf("%d",&tx);
  err=scanf("%d",&ty);

  dx=tx-sx;
  dy=ty-sy;
  
  for(i=0;i<dy;i++){printf("U");}
  for(i=0;i<dx;i++){printf("R");}
  for(i=0;i<dy;i++){printf("D");}
  for(i=0;i<dx;i++){printf("L");}
  printf("L");
  for(i=0;i<dy+1;i++){printf("U");}
  for(i=0;i<dx+1;i++){printf("R");}
  printf("D");
  printf("R");
  for(i=0;i<dy+1;i++){printf("D");}
  for(i=0;i<dx+1;i++){printf("L");}
  printf("U\n");

  return 0;  
}

Compiler output:
main.c: In function 'main':
main.c:8:3: error: 'err' undeclared (first use in this function)
    8 |   err=scanf("%d",&sx);
      |   ^~~
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

sx, sy, tx, ty = map(int, input().split())

dx = abs(tx - sx)
dy = abs(ty - sy)

ans = ''

ans += 'R' * dx
ans += 'U' * dy

ans += 'L' * dx
ans += 'D' * dy

ans += 'D'
ans += 'R' * (dx + 1)
ans += 'U' * (dy + 1)
ans += 'L'

ans += 'U'
ans += 'L' * (dx + 1)
ans += 'D' * (dy + 1)
ans += 'R'

print(ans)


Compiler output:
a.cc:6:7: error: empty character constant
    6 | ans = ''
      |       ^~
a.cc:1:1: error: 'sx' does not name a type
    1 | sx, sy, tx, ty = map(int, input().split())
      | ^~
Language: C++

#include <iostream>
#include <math.h>
#include <algorithm>
#include <vector>
#include <numeric>
#include <string>
#include <iomanip>
using namespace std;
const double PI = acos(-1.0);
const string alp = "abcdefghijklmnopqrstuvwxyz";
const string ALP = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const int INTMAX = 2147483647;
const int INTMIN = -2147483648;
const unsigned int UINTMAX = 4294967295;
const long LONGMAX = 9223372036854775807;
const long LONGMIN = -9223372036854775808;
const unsigned long ULONGMAX = 18446744073709551615;
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define REP1(i,n) FOR(i,1,n+1)
#define SUM(c) accumulate((c).begin(),(c).end(),0)
#define UNIQ(c) (c).erase(unique((c).begin(), (c).end()), (c).end());
#define Yn(b) puts(b?"Yes":"No")
#define YN(b) puts(b?"YES":"NO")
#define fsp(c) fixed << setprecision(c)

bool isprime(int p) {
  if (p==1) return false;
  FOR(i,2,p) {
    if (p%i==0) return false;
  }
  return true;
}

int dig(int n, int a) {return n/(int)pow(10,a)%10;}
int digl(long n, int a) {return n/(long)pow(10,a)%10;}
int digsum(int n) {int r=0;REP(i,10){r+=dig(n,i);}return r;}
int digsuml(long n) {int r=0;REP(i,19){r+=digl(n,i);}return r;}
int dignum(int n) {return n?to_string(n).length():0;}
int dignuml(long n) {return n?to_string(n).length():0;}

double cutl(int i,double n,double r) {
  if (i<=0||n<=i) return 0;
  return r*sqrt(1-((double)i-n/2)*((double)i-n/2)*4/n/n);
}

int main(){
  int sx,sy,tx,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){
    cout << 'L';
  }
  cout << 'L';
  REP(i,ty-sy+1){
    cout << 'U';
  }
  REP(i,tx-sx+1){
    cout << 'R';
  }
  cout << 'DR'
  REP(i,ty-sy+1){
    cout << 'D';
  }
  REP(i,tx-sx+1){
    cout << 'L';
  }
  cout << 'U';
  return 0;
}

Compiler output:
a.cc:16:23: warning: integer constant is so large that it is unsigned
   16 | const long LONGMIN = -9223372036854775808;
      |                       ^~~~~~~~~~~~~~~~~~~
a.cc:17:32: warning: integer constant is so large that it is unsigned
   17 | const unsigned long ULONGMAX = 18446744073709551615;
      |                                ^~~~~~~~~~~~~~~~~~~~
a.cc:71:11: warning: multi-character character constant [-Wmultichar]
   71 |   cout << 'DR'
      |           ^~~~
a.cc: In function 'int main()':
a.cc:71:15: error: expected ';' before 'for'
   71 |   cout << 'DR'
      |               ^
      |               ;
a.cc:72:7: error: 'i' was not declared in this scope
   72 |   REP(i,ty-sy+1){
      |       ^
a.cc:20:34: note: in definition of macro 'FOR'
   20 | #define FOR(i,a,b) for(int i=(a);i<(b);++i)
      |                                  ^
a.cc:72:3: note: in expansion of macro 'REP'
   72 |   REP(i,ty-sy+1){
      |   ^~~
Language: C++

#include<iostream>

using namespace std;

int sx, sy, tx, ty;
int X, Y;

int main(){
	cin >> sx >> sy >> tx >> ty;
	X = tx - sx;
	Y = ty - sy;

	for(int i = 0; i < X; i++){
		cout << R;
	}
	for(int i = 0; i < Y; i++){
		cout << U;
	}
	for(int i = 0; i < X; i++){
		cout << L;
	}
	for(int i = 0; i < Y; i++){
		cout << D;
	}
	cout << D;
	for(int i = 0; i < X; i++){
		cout << R;
	}
	for(int i = 0; i < Y; i++){
		cout << U;
	}
	cout << L;
	cout << U;
	for(int i = 0; i < X; i++){
		cout << R;
	}
	for(int i = 0; i < Y; i++){
		cout << U;
	}
	cout << R;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:25: error: 'R' was not declared in this scope
   14 |                 cout << R;
      |                         ^
a.cc:17:25: error: 'U' was not declared in this scope
   17 |                 cout << U;
      |                         ^
a.cc:20:25: error: 'L' was not declared in this scope
   20 |                 cout << L;
      |                         ^
a.cc:23:25: error: 'D' was not declared in this scope
   23 |                 cout << D;
      |                         ^
a.cc:25:17: error: 'D' was not declared in this scope
   25 |         cout << D;
      |                 ^
a.cc:27:25: error: 'R' was not declared in this scope
   27 |                 cout << R;
      |                         ^
a.cc:30:25: error: 'U' was not declared in this scope
   30 |                 cout << U;
      |                         ^
a.cc:32:17: error: 'L' was not declared in this scope
   32 |         cout << L;
      |                 ^
a.cc:33:17: error: 'U' was not declared in this scope
   33 |         cout << U;
      |                 ^
a.cc:35:25: error: 'R' was not declared in this scope
   35 |                 cout << R;
      |                         ^
a.cc:40:17: error: 'R' was not declared in this scope
   40 |         cout << R;
      |                 ^
Language: C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <vector>
#include <utility>
#include <numeric>
#include <string>
#include <set>
#include <map>
#include <tuple>
#include <queue>
#include <stack>
#include <deque>
#define rep(i, a, n) for(int (i) = (int)(a);(i) < (int)(n);++(i))
#define repe(i, a, n) for(int (i) = (int)(a);(i) <= (int)(n);++(i))
#define repif(i, a, x) for(int (i) = (int)(a);(x);++(i))
#define repr(i, a, n) for(int (i) = (int)(a);(i) > (int)(n);--(i))
#define reper(i, a, n) for(int (i) = (int)(a);(i) >= (int)(n);--(i))
#define SIZE(x) ((int)(x).size())
#define ALL(x) (x).begin(), (x).end()
#define RNG(x, n) &((x)[0]), &((x)[n])
#define BRK(x) { (x); break; }
#define ADD(a, b) ((((a)%MOD)+((b)%MOD))%MOD)
#define MUL(a, b) ((((a)%MOD)*((b)%MOD))%MOD)
#define YES cout << "YES" << endl
#define NO cout << "NO" << endl
#define Yes cout << "Yes" << endl
#define No cout << "No" << endl
#define yes cout << "yes" << endl;
#define no cout << "no" << endl;
#define fcout cout << fixed << setprecision(10)
#define pb push_back
#define pf push_front
#define mt make_tuple
#define fi first
#define se second
#define EPS (1e-20)
#define INF 2147483647
#define MOD 1000000007
using llint = long long;
using VI = std::vector<int>;
using PII = std::pair<int, int>;
using SI = std::set<int>;
using MII = std::map<int, int>;
using TIII = std::tuple<int, int, int>;
using VLL = std::vector<llint>;
using MCI = std::map<char, int>;
using namespace std;


int sx, sy, tx, ty;


string solve(){
	string ans;
	rep(i, sy, ty) ans.pb('U');
	rep(i, sx, tx) ans.pb('R');
	repr(i, ty, sy) ans.pb('D');
	repr(i, tx, sx) ans.pb('L');
	ans.pb('L');
	rep(i, sy, ty+1) ans.pb('U');
	rep(i, sx-1, tx) ans.pb('R');
	ans.pb('D');
	ans.pb('R');
	repr(i, ty, sy-1) ans.pb('D');
	repr(i, tx+1, sx) ans.pb('L');"
	ans.pb('U');
	return ans;
}


signed main(){
	cin >> sx >> sy >> tx >> ty;
	
	cout << solve() << endl;
	
	return 0;
}

Compiler output:
a.cc:67:39: warning: missing terminating " character
   67 |         repr(i, tx+1, sx) ans.pb('L');"
      |                                       ^
a.cc:67:39: error: missing terminating " character
Language: C++

#include<iostream>
#define abs(x) ((x)<0?-1*(x):(x))
using namespace std;
 
int main() {
  int sx, sy;
  int tx, ty;
  
  cin>>sx>>sy;
  cin>>tx>>ty;
  
  if(sx == tx){
    printf("R");
  }
  if(sy==ty)
    printf("D");
  for(int i = 0; i < abs(sx-tx))
    printf("%c",(sx<tx?'R':'L'));
  if(sy==ty)
    printf("U");
  for(int i = 0; i < abs(sy-ty))
    printf("%c",(sy <ty?'U':'D'));
   
  if(sx == tx){
    printf("L");
  }
  
  for(int i = 0; i < abs(sx-tx))
    printf("%c",(sx>tx?'R':'L'));
  for(int i = 0; i < abs(sy-ty))
    printf("%c",(sy>ty?'U':'D'));
   
  return 0;
}
#include<iostream>
#define abs(x) ((x)<0?-1*(x):(x))
using namespace std;

int main() {
  int sx, sy;
  int tx, ty;
  
  cin>>sx>>sy;
  cin>>tx>>ty;
  
  if(sx == tx){
    printf("R");
  }
  if(sy==ty)
    printf("D");
  for(int i = 0; i < abs(sx-tx);i++)
    printf("%c",(sx<tx?'R':'L'));
  if(sy==ty)
    printf("U");
  for(int i = 0; i < abs(sy-ty);i++)
    printf("%c",(sy <ty?'U':'D'));
   
  if(sx == tx){
    printf("L");
  }
  
  for(int i = 0; i < abs(sx-tx);i++)
    printf("%c",(sx>tx?'R':'L'));
  for(int i = 0; i < abs(sy-ty);i++)
    printf("%c",(sy>ty?'U':'D'));
   
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:32: error: expected ';' before ')' token
   17 |   for(int i = 0; i < abs(sx-tx))
      |                                ^
a.cc:21:32: error: expected ';' before ')' token
   21 |   for(int i = 0; i < abs(sy-ty))
      |                                ^
a.cc:28:32: error: expected ';' before ')' token
   28 |   for(int i = 0; i < abs(sx-tx))
      |                                ^
a.cc:30:32: error: expected ';' before ')' token
   30 |   for(int i = 0; i < abs(sy-ty))
      |                                ^
a.cc: At global scope:
a.cc:39:5: error: redefinition of 'int main()'
   39 | int main() {
      |     ^~~~
a.cc:5:5: note: 'int main()' previously defined here
    5 | int main() {
      |     ^~~~
Language: C++

#include<iostream>
#define abs(x) ((x)<0?-1*(x):(x))
using namespace std;

int main() {
  int sx, sy;
  int tx, ty;
  
  cin>>sx>>sy;
  cin>>tx>>ty;
  
  if(sx == tx){
    printf("R");
  }
  if(sy==ty)
    printf("D");
  for(int i = 0; i < abs(sx-tx))
    printf("%c",(sx<tx?'R':'L'));
  if(sy==ty)
    printf("U");
  for(int i = 0; i < abs(sy-ty))
    printf("%c",(sy <ty?'U':'D'));
   
  if(sx == tx){
    printf("L");
  }
  
  for(int i = 0; i < abs(sx-tx))
    printf("%c",(sx>tx?'R':'L'));
  for(int i = 0; i < abs(sy-ty))
    printf("%c",(sy>ty?'U':'D'));
   
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:32: error: expected ';' before ')' token
   17 |   for(int i = 0; i < abs(sx-tx))
      |                                ^
a.cc:21:32: error: expected ';' before ')' token
   21 |   for(int i = 0; i < abs(sy-ty))
      |                                ^
a.cc:28:32: error: expected ';' before ')' token
   28 |   for(int i = 0; i < abs(sx-tx))
      |                                ^
a.cc:30:32: error: expected ';' before ')' token
   30 |   for(int i = 0; i < abs(sy-ty))
      |                                ^
Language: C++

l = input().split(' ')

y = int(l[3]) - int(l[1])
x = int(l[2]) - int(l[0])

def my_print(i,str):
    for j in range(i):
        print(str,end='')
"""
for i in range(x):
    print('U',end='')

for i in range(y):
    print('R',end='')

for i in range(x):
    print('D',end='')

for i in range(y+1):
    print('L',end='')

for i in range"
"""
my_print(y,'U')
my_print(x,'R')
my_print(y,'D')
my_print(x+1,'L')
my_print(y+1,'U')
my_print(x+1,'R')
my_print(1,'D')
my_print(1,'R')
my_print(y,'D')
my_print(x+1,'L')
my_print(1,'U')


print()


Compiler output:
a.cc:8:23: error: empty character constant
    8 |         print(str,end='')
      |                       ^~
a.cc:9:3: warning: missing terminating " character
    9 | """
      |   ^
a.cc:9:3: error: missing terminating " character
a.cc:11:19: error: empty character constant
   11 |     print('U',end='')
      |                   ^~
a.cc:14:19: error: empty character constant
   14 |     print('R',end='')
      |                   ^~
a.cc:17:19: error: empty character constant
   17 |     print('D',end='')
      |                   ^~
a.cc:20:19: error: empty character constant
   20 |     print('L',end='')
      |                   ^~
a.cc:22:15: warning: missing terminating " character
   22 | for i in range"
      |               ^
a.cc:22:15: error: missing terminating " character
a.cc:23:3: warning: missing terminating " character
   23 | """
      |   ^
a.cc:23:3: error: missing terminating " character
a.cc:1:1: error: 'l' does not name a type
    1 | l = input().split(' ')
      | ^
Language: C++

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
char str[100005];
int main()
{
	int sx,sy,tx,ty;
	while(scanf("%d%d%d%d",&sx,&sy,&tx,&ty)！=EOF)
	{
		int ans=sqrt((ty-sy)*(ty-sy));
		int sum=sqrt((tx-sx)*(tx-sx));
		for(int i=1; i<=ans; i++)
		printf("U");
		for(int i=1; i<=sum; i++)
		printf("R");
	//	if(ans>=2&&sum>=2)
		{
			printf("D");
			for(int i=1; i<=sum-1; i++)
			printf("L");
			for(int i=1; i<=ans-1; i++)
			printf("D");
			printf("LL");
			for(int i=1; i<=ans+1; i++)
			printf("U");
			for(int i=1; i<=sum+2; i++)
			printf("R");
			printf("DDD");
			for(int i=1; i<=sum-1; i++)
			printf("L");
			for(int i=1; i<=ans-1; i++)
				printf("D");
				printf("LLU\n");
		}
	//	else
//		printf("")
		
		
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:48: error: expected ')' before '\U0000ff01'
    9 |         while(scanf("%d%d%d%d",&sx,&sy,&tx,&ty)！=EOF)
      |              ~                                 ^~
      |                                                )
a.cc:9:48: error: '\U0000ff01' was not declared in this scope
    9 |         while(scanf("%d%d%d%d",&sx,&sy,&tx,&ty)！=EOF)
      |                                                ^~
Language: C++

// ------------------------------------
// Date:2018/ 2/26
// Problem:ABC 051 BackAndForth c.cpp
//
// ------------------------------------

#include <bits/stdc++.h>

using namespace std;

#define EACH(i,a) for (auto&& i : a)
#define FOR(i,a,b) for(int i=(int)a;i<(int)b;++i)
#define RFOR(i,a,b) for(int i=(int)b-1;i>=(int)a;--i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define ALL(a) (a).begin(),(a).end()
#define debug(x) cerr << #x << ":" << x << endl

typedef long long ll;

#define MOD 1000000007

int main()
{
  memset(dp,0,sizeof(dp));
  int sx,sy,tx,ty;
  cin >> sx >> sy >> tx >> ty;
  int mx,my;
  string output = "";
  mx = tx - sx;
  my = ty - sy;
  REP(h,2) {
    if (h == 1) {
      output += "D";
    }
    REP(i,mx+h) {
      output += "R";
    }
    REP(i,my+h) {
      output += "U";
    }
    if (h == 1) {
      output += "LU";
    }
    REP(i,mx+h) {
      output += "L";
    }
    REP(i,my+h) {
      output += "D";
    }
    if (h == 1) {
      output += "R";
    }
  }
  cout << output << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:10: error: 'dp' was not declared in this scope; did you mean 'dup'?
   25 |   memset(dp,0,sizeof(dp));
      |          ^~
      |          dup
Language: C++

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <cmath>
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define MA(i,j) make_pair(i,j)
#define PA pair<int,int>
#define PB push_back
#define PQ priority_queue<int>
#define PGQ priority_queue<int,vector<int>,greater<int> >
#define VE vector<int>
#define VP vector<PA>
#define YES(i) cout<<(i?"YES":"NO")<<endl
#define Yes(i) cout<<(i?"Yes":"No")<<endl
#define MOD 1000000007
#define INF 1000000007
#define PI 3.14159265358979323846
using namespace std;
//
int SX,SY,TX,TY;
int main(){
  cin>>SX>>SY>>TX>>TY;
  FOR(i,0,TX-SX){
    cout<<"R";
  }
  FOR(i,0,TY-SY+1){
    cout<<"U";
  }
  FOR(i,0,TX-SX+1){
    cout<<"L";
  }
  FOR(i,0,TY-XY+1){
    cout<<"D";
  }
  cout<<"R";
  cout<<"D";
  FOR(i,0,TX-SX+1){
    cout<<"R";
  }
  FOR(i,0,TY-XY+1){
    cout<<"U";
  }
  FOR(i,0,TX-SX+1){
    cout<<"L";
  }
  FOR(i,0,TY-SY){
    cout<<"D";
  }
  cout<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:14: error: 'XY' was not declared in this scope; did you mean 'TY'?
   38 |   FOR(i,0,TY-XY+1){
      |              ^~
a.cc:11:34: note: in definition of macro 'FOR'
   11 | #define FOR(i,a,b) for(int i=a;i<b;i++)
      |                                  ^
a.cc:46:14: error: 'XY' was not declared in this scope; did you mean 'TY'?
   46 |   FOR(i,0,TY-XY+1){
      |              ^~
a.cc:11:34: note: in definition of macro 'FOR'
   11 | #define FOR(i,a,b) for(int i=a;i<b;i++)
      |                                  ^
Language: C++

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

int sx,sy,tx,ty;

int dx,dy;

char right_;
char left_;
char up_;
char down_;

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

	if(sx <= tx)
	{
		right_ = 'R';
		left_ = 'L';
	}
	else
	{
		right_ = 'L';
		left_ = 'R';
	}

	if(sy <= ty)
	{
		up_ = 'U';
		down_ = 'D';
	}
	else
	{
		up_ = 'D';
		down_ = 'U';
	}

	dx = abs(sx - tx);
	dy = abs(sy - ty);

	for(int i = 0;i < dx;i++)
	{
		cout << right_;
	}
	for(int i = 0;i < dy;i++)
	{
		cout << up_;
	}
	for(int i = 0;i < dx;i++)
	{
		cout << left_;
	}
	for(int i = 0;i < dy;i++)
	{
		cout << down_;
	}
	cout << down_;
	for(int i = 0;i < dx + 1;i++)
	{
		cout << right_;
	}
	for(int i = 0;i < dy + 1;i++)
	{
		cout << up_;	
	}
	cout << left_;
	cout << up_;
	for(int i = 0;i < dx + 1;i++)
	{
		cout << left_;
	}
	for(int i = 0;i < dy + 1S;i++)
	{
		cout << down_;
	}
	cout << right_;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:75:32: error: unable to find numeric literal operator 'operator""S'
   75 |         for(int i = 0;i < dy + 1S;i++)
      |                                ^~
Language: C++

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

int main(void){

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

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:46: error: expected primary-expression before ';' token
    9 |     for(int i = 0; i < x; i++) cout << "R" <<;
      |                                              ^
a.cc:10:46: error: expected primary-expression before ';' token
   10 |     for(int i = 0; i < y; i++) cout << "U" <<;
      |                                              ^
a.cc:11:46: error: expected primary-expression before ';' token
   11 |     for(int i = 0; i < x; i++) cout << "L" <<;
      |                                              ^
a.cc:12:46: error: expected primary-expression before ';' token
   12 |     for(int i = 0; i < y; i++) cout << "D" <<;
      |                                              ^
a.cc:15:47: error: expected primary-expression before ';' token
   15 |     for(int i = 0; i <= x; i++) cout << "R" <<;
      |                                               ^
a.cc:16:47: error: expected primary-expression before ';' token
   16 |     for(int i = 0; i <= y; i++) cout << "U" <<;
      |                                               ^
a.cc:19:47: error: expected primary-expression before ';' token
   19 |     for(int i = 0; i <= x; i++) cout << "L" <<;
      |                                               ^
a.cc:20:47: error: expected primary-expression before ';' token
   20 |     for(int i = 0; i <= y; i++) cout << "D" <<;
      |                                               ^
Language: C++


 
 
using namespace std;
#include<iostream>
#include<string>
 
int main()
{
    int a,b,c,d,e,f;
    cin>>a>>b>>c>>d;
    f=c-a;
    e=d-b;
    if(e>1 && f>1)
    {
        for(int i=0;i<e-1;i++)
            cout<<"U";
        for(int j=0;j<f-1;j++)
            cout<<"R";
        cout<<"U"<<"RR";
        for(int k=0;k<e;k++)
            cout<<"D";
        for(int h=0;h<f-1;h++)
            cout<<"L";
            cout<<"D"<<"LLURU";
        for(int b=0;b<f-1;b++)
            cout<<"R";
        for(int p=0;p<e;p++)
            cout<<"U";
        for(int q=0;q<f-1;q++)
            cout<<"L";
            cout<<"DLL";
        for(int t=0;t<e;t++)
            cout<<"D";
            cout<<"R";
    }
    else
    {
        for(int b=0;b<e;b++)
            cout<<"U";
        for(int b=0;b<f;b++)
            cout<<"L";
        for(int b=0;b<e;b++)
            cout<<"D";
        for(int b=0;b<f;b++)
            cout<<"L";
            cout<<"L";
        for(int b=0;b<e+1;b++)
            cout<<"U";
        for(int b=0;b<f+1;b++)
            cout<<"R";
            cout<<"DR";
            for(int b=0;b<e+1;b++)
            cout<<"D";
            for(int b=0;b<f+1;b++)
            cout<<"L";
            cout<<"U";
    }
 }
 
 
 
    return 0;

Compiler output:
a.cc:63:5: error: expected unqualified-id before 'return'
   63 |     return 0;
      |     ^~~~~~
Language: C++

#include<iostream>

using namespace std;

int main()
{
    int sx,sy,tx,ty;
    cin>>sx>>sy>>tx>>ty;
    int l=tx-sx, h=ty-sy, i, j, k=0;
    for (i=0; i<h; i++)
    {  
        a[k++]='U';
    }
    for (j=0; j<l; j++)
    {
        a[k++]='R';
    }
    for (i=0; i<h; i++)
    {  
        a[k++]='D';
    }
    for (j=0; j<l; j++)
    {
        a[k++]='L';
    }
    a[k++]='L';
    for (i=0; i<=h; i++)
    {  
        a[k++]='U';
    } 
    for (j=0; j<=l; j++)
    {
        a[k++]='R';
    }
    a[k++]='D';
    a[k++]='R';
    for (i=0; i<=h; i++)
    {  
        a[k++]='D';
    }
    for (j=0; j<=l; j++)
    {
        a[k++]='L';
    }
    a[k++]='U';
    for (i=0; i<k; i++)
        cout<<a[i];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'a' was not declared in this scope
   12 |         a[k++]='U';
      |         ^
a.cc:16:9: error: 'a' was not declared in this scope
   16 |         a[k++]='R';
      |         ^
a.cc:20:9: error: 'a' was not declared in this scope
   20 |         a[k++]='D';
      |         ^
a.cc:24:9: error: 'a' was not declared in this scope
   24 |         a[k++]='L';
      |         ^
a.cc:26:5: error: 'a' was not declared in this scope
   26 |     a[k++]='L';
      |     ^
Language: C++

#include<isotream>
#include<algorithm>

using namespace std;
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 < ty;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+1;i++)cout << "R";
  for(int i = sy-1;i < ty;i++)cout << "U";
  cout << "L";
  cout << "U";
  for(int i = tx;i > sx-1;i--)cout << "L";
  for(int i = ty+1;i > sy;i--)cout << "D";
  cout << "R" << endl;
  return 0;
}

Compiler output:
a.cc:1:9: fatal error: isotream: No such file or directory
    1 | #include<isotream>
      |         ^~~~~~~~~~
compilation terminated.
Language: Java

import java.util.*;
public class c{
	    public static void main(String[] args) {
	        Scanner sc = new Scanner(System.in);
	        StringBuilder sb = new StringBuilder();
	        int sx =  Integer.parseInt(sc.next());
	        int sy =  Integer.parseInt(sc.next());      
	        int tx =  Integer.parseInt(sc.next());               
	        int ty =  Integer.parseInt(sc.next());        
	        int dx = tx - sx;
	        int dy = ty - sy;
	        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');
	        }
	        sb.append('D');
	        for(int i = 0; i < dx+1; i++){
	            sb.append('R');            
	        }       
	        for(int i = 0; i < dy+1; i++ ){ 
	            sb.append('U');
	        }
	        sb.append('L');
	        sb.append('U');
	        for(int i = 0; i < dx+1; i++ ){
	            sb.append('L');
	        }        
	        for(int i = 0; i < dy+1; i++){
	            sb.append('D');
	        } 
	        sb.append('R'); 
	        System.out.println(new String(sb));
	    }
 }

Compiler output:
Main.java:2: error: class c is public, should be declared in a file named c.java
public class c{
       ^
1 error
Language: C++

#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <set>
#include <map>
#include <deque>
#define WMAX 10000
#define HMAX 10000

//コメントアウトするとdebug()を実行しない
#define DEBUG

using namespace std;
template<typename A, size_t N, typename T>
void Fill(A (&array)[N], const T &val){
    std::fill( (T*)array, (T*)(array+N), val );
}

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

int sx,sy,tx,ty;

static const int dx[8] = {0,1,1,1,0,-1,-1,-1},
					dy[8] = {1,1,0,-1,-1,-1,0,1};

void solve(){

}

void debug(){

}

void answer(){
	cout << ans << "\n";
}

int main(){
	cin >> sx >> sy >> tx >> ty;
	int x = tx-sx,y = ty-sy;
	for (int i = 0; i < y; ++i)
	{
		cout << 'U';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'R';
	}
	for (int i = 0; i < y+1; ++i)
	{
		cout << 'D';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'L';
	}
	cout << "UL";
	for (int i = 0; i < y+1; ++i)
	{
		cout << 'U';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'R';
	}
	cout << 'D';
	cout << "\n";
	return 0;
}

Compiler output:
a.cc: In function 'void answer()':
a.cc:42:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   42 |         cout << ans << "\n";
      |                 ^~~
      |                 abs
Language: C++

#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <set>
#include <map>
#include <deque>
#define WMAX 10000
#define HMAX 10000

//コメントアウトするとdebug()を実行しない
#define DEBUG

using namespace std;
template<typename A, size_t N, typename T>
void Fill(A (&array)[N], const T &val){
    std::fill( (T*)array, (T*)(array+N), val );
}

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

int sx,sy,tx,ty;

static const int dx[8] = {0,1,1,1,0,-1,-1,-1},
					dy[8] = {1,1,0,-1,-1,-1,0,1};

void solve(){

}

void debug(){

}

void answer(){
	cout << ans << "\n";
}

int main(){
	cin >> sx >> sy >> tx >> ty;
	int x = tx-sx,y = ty-sy;
	for (int i = 0; i < y; ++i)
	{
		cout << 'U';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'R';
	}
	for (int i = 0; i < y+1; ++i)
	{
		cout << 'D';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'L';
	}
	cout << 'UL';
	for (int i = 0; i < y+1; ++i)
	{
		cout << 'U';
	}
	for (int i = 0; i < x+1; ++i)
	{
		cout << 'R';
	}
	cout << 'D';
	cout << "\n";
	return 0;
}

Compiler output:
a.cc:64:17: warning: multi-character character constant [-Wmultichar]
   64 |         cout << 'UL';
      |                 ^~~~
a.cc: In function 'void answer()':
a.cc:42:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   42 |         cout << ans << "\n";
      |                 ^~~
      |                 abs
Language: C++

#include <iostream>

using namespace std;

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

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

    for(int y = ty; y > sy; y--){
        cout << "D";
    }
    for(int x = tx; x > sx; x--){
        cout << "L";
    }


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

    for(int x = tx; x > sx; x--){
        cout << "L";
    } 
    cout << "L";
    cout << "U";


    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:48:2: error: expected '}' at end of input
   48 | }
      |  ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
int x1,y1,x2,y2;
int main()
{
    while (~scanf("%d%d%d%d",&x1,&y1,&x2,&y2)){
        int c1=x2-x1;
        int c2=y2-y1;
        for (int i=0;i<c2;++i)
            printf("U");
        for (int i=0;i<c1;++i)
            printf("R");
        for (int i=0;i<c2;++i)
            printf("D");
        for (int i=0;i<c1;++i)
            printf("L");
        printf("L");
        for (int i=0;i<=c2;++i)
            printf("U");
        for (int i=0;i<=c1;++i)
            printf("R");
        printf("D");
        printf("R");
        for (int i=0;i<=c2;++i)
            printf("D");
        for (int i=0;i<=c1;++i)
            printf("L");
        printf("U\n");
    }
    return 0;
}


Compiler output:
a.cc:4:8: error: 'int y1' redeclared as different kind of entity
    4 | int x1,y1,x2,y2;
      |        ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:9:18: error: invalid operands of types 'int' and 'double(double) noexcept' to binary 'operator-'
    9 |         int c2=y2-y1;
      |                ~~^~~
      |                |  |
      |                |  double(double) noexcept
      |                int
Language: C

#include<stdio.h>
#include<string.h>

int main(){
	int sx,sy,tx,ty,x,y,i;
	char S[4000];
	char a[1000] ="R";
	char b[1000]="L";
	char c[1000]="DRRR";
	char d[1000]="ULLL";
	scanf("%d %d %d %d",sx,sy,tx,ty);
	x=tx-sx,y=ty-sy;
	
	if(x>=2)
	{
		for(i=1;i<=x-1;i++)
		{
			strcat(a,"R");
			strcat(b,"L");
			strcat(c,"R");
			strcat(d,"L");
		}	
	}
	strcat(c,"U");
	strcat(d,"D");
	
	for(i=1;i<=y;i++)
	{
		strcat(a,"U");
		strcat(b,"D");
		strcat(c,"UU");
		strcat(d,"DD");
	}
	strcat(c,"L");
	strcat(d,"R");
	
	
	S=a;
	//strcat(S,a);
	strcat(S,b);
	strcat(S,c);
	strcat(S,d);
	printf("%s",s);
	
	return 0;
}



Compiler output:
main.c: In function 'main':
main.c:38:10: error: assignment to expression with array type
   38 |         S=a;
      |          ^
main.c:43:21: error: 's' undeclared (first use in this function)
   43 |         printf("%s",s);
      |                     ^
main.c:43:21: note: each undeclared identifier is reported only once for each function it appears in