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

#include <iostream>

using namespace std;

int main()
{
	char str[105];
	scanf("%s", str + 1);
	size_t length = strlen(str + 1);
	for (size_t i = 1; i <= length; i += 2)
	{
		if (str[i] != 'R' && str[i] != 'U' && str[i] != 'D')
		{
			puts("No");
			return 0;
		}
	}
	for (size_t i = 2; i <= length; i += 2)
	{
		if (str[i] != 'L' && str[i] != 'U' && str[i] != 'D')
		{
			puts("No");
			return 0;
		}
	}
	puts("Yes");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: 'strlen' was not declared in this scope
    9 |         size_t length = strlen(str + 1);
      |                         ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 |
Language: C++

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

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	string inp;
	cin >> inp;
	bool ans = false;
	for(ll i=0; i<inp.size(); i++){
		if( (inp[i] == 'R' && i%2 == 1) || (inp[i] == 'L' && i%2 == 0) )
			ans = true;
	}
	cout << (!ans) ? "Yes" : "No";
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'll' was not declared in this scope
   11 |         for(ll i=0; i<inp.size(); i++){
      |             ^~
a.cc:11:21: error: 'i' was not declared in this scope
   11 |         for(ll i=0; i<inp.size(); i++){
      |                     ^
Language: C++

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

int main(){
  string s;
  cin >> s;
  for(int i=0; i < s.size()-1; i++){
    if(i%2 == 0){
      if(s[i]=='L'){
        cout << "No" << endl;
        return 0;
      }
    }else{
      if(s[j]=='R'){
        cout << "No" << endl;
        return 0;
      }
    }
  }
  cout << "Yes" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:12: error: 'j' was not declared in this scope
   15 |       if(s[j]=='R'){
      |            ^
Language: C++

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

int main(){
  string s;
  cin >> s;
  if(s.size()%2 == 0){
    for(int i=0; s[i]!='\0'; i = i+2){
      if(s[i]=='L'){
        cout << 'No' << endl;
        return 0;
      }
    }
  }else{
    for(int j=1; s[j]!='\0'; i = i+2){
      if(s[j]=='R'){
        cout << 'No' << endl;
        return 0;
      }
    }
  }
  cout << 'Yes' << endl;
  return 0;
}

Compiler output:
a.cc:11:17: warning: multi-character character constant [-Wmultichar]
   11 |         cout << 'No' << endl;
      |                 ^~~~
a.cc:18:17: warning: multi-character character constant [-Wmultichar]
   18 |         cout << 'No' << endl;
      |                 ^~~~
a.cc:23:11: warning: multi-character character constant [-Wmultichar]
   23 |   cout << 'Yes' << endl;
      |           ^~~~~
a.cc: In function 'int main()':
a.cc:16:30: error: 'i' was not declared in this scope
   16 |     for(int j=1; s[j]!='\0'; i = i+2){
      |                              ^
Language: C++

#include "bits/stdc++.h"

#define REP(i, n) for (ll i = 0; i < ll(n); ++i)
#define RREP(i, n) for (ll i = ll(n) - 1; i >= 0; --i)
#define FOR(i, m, n) for (ll i = m; i < ll(n); ++i)
#define RFOR(i, m, n) for (ll i = ll(n) - 1; i >= ll(m); --i)
#define ALL(v) (v).begin(), (v).end()
#define UNIQUE(v) v.erase(unique(ALL(v)), v.end());
#define INF 1000000001ll
#define MOD 1000000007ll
#define EPS 1e-9

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

using namespace std;

using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

template <class T> bool chmin(T &a, const T &b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  string s;
  cin >> s;
  bool ok = true;
  REP(i, n) {
    if (i & 1) {
      if (s[i] == 'R')
        ok = false;
    } else {
      if (s[i] == 'L')
        ok = false;
    }
  }
  cout << (ok ? "Yes" : "No") << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:10: error: 'n' was not declared in this scope
   47 |   REP(i, n) {
      |          ^
a.cc:3:41: note: in definition of macro 'REP'
    3 | #define REP(i, n) for (ll i = 0; i < ll(n); ++i)
      |                                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
// ----------------------R00TDADA------------------------------
#define rep(i, a, b) for (__typeof((b)) i = (a); i < (b); i++)
#define nrep(i, a, b) for (__typeof((b)) i = (b); i > (a); i--)
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define ppi pair<int, int>
#define pppi pair<ppi, int>
#define vi vector<int>
#define vii vector<ppi>
#define viii vector<pppi>
#define vs vector<string>
#define pb push_back
#define mp make_pair
#define sz(x) (int)x.size()
#define M_PI 3.14159265358979323846
#define rootdada ios_base::sync_with_stdio(false)
#define int long long
int nCr(int n, int k)
{
    int C[n + 1][k + 1];
    int i, j;
    for (i = 0; i <= n; i++)
    {
        for (j = 0; j <= min(i, k); j++)
        {
            //Base case
            if (j == 0 || j == i)
                C[i][j] = 1;
            else
            {
                C[i][j] = C[i - 1][j - 1] + C[i - 1][j];
            }
        }
    }
    return C[n][k];
}

signed main()
{
    rootdada;
    string s;
    cin>>s;
    int i,c=0,d=0;
    rep(i,0,s.length());
    {
        if(i%2==0)
        {
            if(s[i]=='L'|| s[i]=='U' || s[i]=='D')
                c++;
        }
        else{
            if(s[i]=='R' || s[i]=='U' || s[i]=='D')
                d++;
        }

    }
    if(s.length()==c+d)
        cout<<"YES"<<endl;
    else 
    {
        cout<<"NO"<<endl;
    }
        
    }
}

Compiler output:
a.cc:68:1: error: expected declaration before '}' token
   68 | }
      | ^
Language: C++

#include<cstdio>
#include<cstring>
#include<string>
using namespace std;
char In[105];
int main() {
	bool Che=true;
	gets(In);
	int length=strlen(In);
	for(int i=0;i<length;i++) {
		if((i&1) && (In[i]=='R')) {
			Che=false;
			break;
		} 
		if(!(i&1) && (In[i]=='L')) {
			Che=false;
			break;
		}
	}
	if(Che) printf("YES\n");
	else printf("NO\n");
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |         gets(In);
      |         ^~~~
      |         getw
Language: C++

#include<cstdio>
#include<cstring>
using namespace std;
char In[105];
int main() {
	bool Che=true;
	gets(In);
	int length=strlen(In);
	for(int i=0;i<length;i++) {
		if((i&1) && (In[i]=='R')) {
			Che=false;
			break;
		} 
		if(!(i&1) && (In[i]=='L')) {
			Che=false;
			break;
		}
	}
	if(Che) printf("YES\n");
	else printf("NO\n");
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(In);
      |         ^~~~
      |         getw
Language: C++

#include<iostream>
#include<cstdio>
#include<string>
using namespace std;
int main(){
  string s;
  
  cin>>s;
  bool flg=true;
  
  for(int i=0;i<s.size();i++){
    if(i%2==0&&(s[i]!='L'&&s[i]!='U'&&s[i]!='D'))flg=false;
    if(i%2==1&&(s[i]!='R'&&s[i]!='U'&&s[i]!='D'))flg=false;
    if(!flg)break;
  }
  
  if(flg)puts("Yes");
  else puts("No");
  
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:20:12: error: expected '}' at end of input
   20 |   return 0;
      |            ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
#include<string>
 
int main(){
string a;
  cin>>a;
  for(int i=0;i<a.length();i++){
  if(s[i]=='L'&&(i%2==0)){cout<<"No";
                         return 0;
                         }
    else {
    if(s[i]=='R'){
    cout<<"No";
      return 0;
    
    }
    
    }
  }
 
 
cout<<"Yes";
 
 
return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:6: error: 's' was not declared in this scope
    9 |   if(s[i]=='L'&&(i%2==0)){cout<<"No";
      |      ^
Language: C++

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

int main(){
string a;
  cin>>a;
  for(int i=0;i<s.length();i++){
  if(s[i]=='L'&&(i%2==0)){cout<<"No";
                         return 0;
                         }
    else {
    if(s[i]=='R'){
    cout<<"No";
      return 0;
    
    }
    
    }
  }


cout<<"Yes";


return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: 's' was not declared in this scope
    8 |   for(int i=0;i<s.length();i++){
      |                 ^
Language: C

#include <stdio.h>

int main(void) {

	char S[112];

    scanf("%s",S);
  
    for(int i = 0;i < 112;++i){
      if((i - 1) % 2 = 0 && S[i - 1] == 'R' || S[i - 1] == 'U' || S[i - 1] == 'D'){
        puts("Yes");
      }
      else if((i - 1) % 2 = 1 && S[i - 1] == 'L' || S[i - 1] == 'U' || S[i - 1] == 'D'){
        puts("Yes");
      }
      else{
        puts("No");
      }

	return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:22: error: lvalue required as left operand of assignment
   10 |       if((i - 1) % 2 = 0 && S[i - 1] == 'R' || S[i - 1] == 'U' || S[i - 1] == 'D'){
      |                      ^
main.c:13:27: error: lvalue required as left operand of assignment
   13 |       else if((i - 1) % 2 = 1 && S[i - 1] == 'L' || S[i - 1] == 'U' || S[i - 1] == 'D'){
      |                           ^
main.c:21:1: error: expected declaration or statement at end of input
   21 | }
      | ^
Language: Java

import java.util.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<char> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
    Set<char> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
    int current_step = 0;
    String steps = sc.next();
    // "RUDLUDR"
    for(int i=0; i<100;i++){
      char step = steps.charAt(i);
      if(i % 2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(i % 2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}

Compiler output:
Main.java:6: error: unexpected type
    Set<char> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
        ^
  required: reference
  found:    char
Main.java:7: error: unexpected type
    Set<char> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
        ^
  required: reference
  found:    char
2 errors
Language: Java

import java.util.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<Char> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
    Set<Char> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
    int current_step = 0;
    String steps = sc.next();
    // "RUDLUDR"
    for(int i=0; i<100;i++){
      Char step = steps.charAt(i);
      if(i % 2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(i % 2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}

Compiler output:
Main.java:6: error: cannot find symbol
    Set<Char> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
        ^
  symbol:   class Char
  location: class Main
Main.java:7: error: cannot find symbol
    Set<Char> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
        ^
  symbol:   class Char
  location: class Main
Main.java:12: error: cannot find symbol
      Char step = steps.charAt(i);
      ^
  symbol:   class Char
  location: class Main
3 errors
Language: Java

import java.util.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<String> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
    Set<String> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
    int current_step = 0;
    String steps = sc.next();
    // "RUDLUDR"
    for(int i=0; i<100;i++){
      String step = steps.charAt(i);
      if(i % 2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(i % 2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}

Compiler output:
Main.java:12: error: incompatible types: char cannot be converted to String
      String step = steps.charAt(i);
                                ^
1 error
Language: Java

import java.util.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<String> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
    Set<String> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
    int current_step = 0;
    String steps = sc.next();
    // "RUDLUDR"
    for(int i=0; i<100;i++){
      String step = steps[i];
      if(i % 2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(i % 2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}

Compiler output:
Main.java:12: error: array required, but String found
      String step = steps[i];
                         ^
1 error
Language: Java

import java.util.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<String> ODD_STEP = new HashSet<String>(Arrays.asList("R","U","D"));
    Set<String> EVEN_STEP = new HashSet<String>(Arrays.asList("L","U","D"));
    int current_step = 0;
    
    for(int i=0; i<100;i++){
      String step = sc.next();
      if(step %2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(step %2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  
  }
 
}

Compiler output:
Main.java:12: error: bad operand types for binary operator '%'
      if(step %2 == 0 && !EVEN_STEP.contains(step)){
              ^
  first type:  String
  second type: int
Main.java:14: error: bad operand types for binary operator '%'
      }else if(step %2 != 0 && !ODD_STEP.contains(step)){
                    ^
  first type:  String
  second type: int
2 errors
Language: Java

import java.util.*;

public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    Set<String> ODD_STEP = ["R","U","D"];
    Set<String> EVEN_STEP = ["L","U","D"];
    int current_step = 0;
    
    for(int i=0; i<100;i++){
      String step = sc.next();
      if(step %2 == 0 && !EVEN_STEP.contains(step)){
        break;
      }else if(step %2 != 0 && !ODD_STEP.contains(step)){
        break;
      }
      current_step++;
    }
    
    if(current_step == 100){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  
  }

}

Compiler output:
Main.java:6: error: illegal start of expression
    Set<String> ODD_STEP = ["R","U","D"];
                           ^
Main.java:7: error: illegal start of expression
    Set<String> EVEN_STEP = ["L","U","D"];
                            ^
2 errors
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//code starts now
      	for(int i=0; i<s.length-1; i+=2){
   			if(s.charAt(i)!='R' && s.charAt(i)!='U' && s.charAt(i)!='D'){
              System.out.println("No");
              break;
            }
          
          if(s.charAt(i+1)!='L' && s.charAt(i+1)!='U' && s.charAt(i+1)!='D'){
              System.out.println("No");
              break;
            }
          j
          System.out.println("Yes");
          
          	
        }
	}
}

Compiler output:
Main.java:18: error: ';' expected
          System.out.println("Yes");
                ^
1 error
Language: C++

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

int main(){
  string S;
  cin >> S;
  int N=S.size();
  for(int i=0;i<N;i++){
    if(i%2==0){
      if(S.at(i)=="L"){
        cout << "No" << endl;
        return 0;
      }
    }else{
      if(S.at(i)=="R"){
        cout << "No" << endl;
        return 0;
      }
    }
  }
  cout << "Yes" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   11 |       if(S.at(i)=="L"){
      |          ~~~~~~~^~~~~
a.cc:16:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   16 |       if(S.at(i)=="R"){
      |          ~~~~~~~^~~~~
Language: C++

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

int main(){
  string s;
  cin >> s;
  int i;
  for(i=0; i<100; i++){
    if(s[2*i]="R"||s[2*i+1]="L"){
      cout << "NO" << endl;
    }else {
      cout << "Yes" << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:18: error: lvalue required as left operand of assignment
    9 |     if(s[2*i]="R"||s[2*i+1]="L"){
Language: C++

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

int main(){
  string s;
  cin >> s;
  int i;
  for(i=0,; i<100; i++){
    if(s[2*i]="R"||s[2*i+1]="L"){
      cout << "NO" << endl;
    }else {
      cout << "Yes" << endl;
    }
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: expected primary-expression before ';' token
    8 |   for(i=0,; i<100; i++){
      |           ^
a.cc:9:18: error: lvalue required as left operand of assignment
    9 |     if(s[2*i]="R"||s[2*i+1]="L"){
Language: C++

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

int main(){
  string s;
  cin >> s;
  int i;
  for(i=0, i<100, i++){
    if(s[2*i]="R"||s[2*i+1]="L"){
      cout << "NO" << endl;
    }else {
      cout << "Yes" << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:22: error: expected ';' before ')' token
    8 |   for(i=0, i<100, i++){
      |                      ^
      |                      ;
a.cc:15:1: error: expected primary-expression before '}' token
   15 | }
      | ^
a.cc:14:4: error: expected ';' before '}' token
   14 |   }
      |    ^
      |    ;
   15 | }
      | ~   
a.cc:15:1: error: expected primary-expression before '}' token
   15 | }
      | ^
a.cc:14:4: error: expected ')' before '}' token
   14 |   }
      |    ^
      |    )
   15 | }
      | ~   
a.cc:8:6: note: to match this '('
    8 |   for(i=0, i<100, i++){
      |      ^
a.cc:15:1: error: expected primary-expression before '}' token
   15 | }
      | ^
Language: C++

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

int main(){

        string line;
        getline(cin,line);
        int a=1;

        for(int i=1;i<100&&line[i]!=0;i+=2){
               if(line[i]!='R'||line[i]!='U'||line[i]!='D'){
                       a=0;
               }


        for(int i=0;i<100&&line[i]!=0;i+=2){
               if(line[i]!='L'||line[i]!='U'||line[i]!='D'){
                       a=0;
               }
        }

        if(a==1){
                cout<<"Yes";
        }else{
                cout<<"No";
        }
        return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:29:2: error: expected '}' at end of input
   29 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

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

int main(){

        string line;
        getline(cin,line);
        int a=1;

        for(int i=1;i<100&&line[i]!=\0;i+=2){
               if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
                       a=0;
               }


        for(int i=0;i<100&&line[i]!=\0;i+=2){
               if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
                       a=0;
               }

        if(a==1){
                cout<<"Yes";
        }else{
                cout<<"No";
        }
        return 0;
}



Compiler output:
a.cc:11:37: error: stray '\' in program
   11 |         for(int i=1;i<100&&line[i]!=\0;i+=2){
      |                                     ^
a.cc:17:37: error: stray '\' in program
   17 |         for(int i=0;i<100&&line[i]!=\0;i+=2){
      |                                     ^
a.cc: In function 'int main()':
a.cc:12:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:12:40: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:12:54: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:18:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:18:40: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:18:54: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:28:2: error: expected '}' at end of input
   28 | }
      |  ^
a.cc:11:45: note: to match this '{'
   11 |         for(int i=1;i<100&&line[i]!=\0;i+=2){
      |                                             ^
a.cc:28:2: error: expected '}' at end of input
   28 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

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

int main(){

        string line;
        getline(cin,line);
        int a=1;

        for(int i=0;i<100&&i%2==0;i++){
               if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
                       a=0;
               }


        for(int i=0;i<100&&i%2!=0;i++){
               if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
                       a=0;
               }

        if(a==1){
                cout<<"Yes";
        }else{
                cout<<"No";
        }
        return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:12:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:12:40: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:12:54: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |                if(line[i]!="R"||line[i]!="U"||line[i]!="D"){
a.cc:18:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:18:40: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:18:54: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                if(line[i]!="L"||line[i]!="U"||line[i]!="D"){
a.cc:28:2: error: expected '}' at end of input
   28 | }
      |  ^
a.cc:11:39: note: to match this '{'
   11 |         for(int i=0;i<100&&i%2==0;i++){
      |                                       ^
a.cc:28:2: error: expected '}' at end of input
   28 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

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

int main()
{
	ios_base::sync_with_stdio(0);

	string s;
	cin >> s;

	for(int i=0;i<n;i++){
		if(i%2==0 && s[i]!='R' && s[i]!='U' && s[i]!='D') {puts("No"); return 0;}
		else if(i%2 && s[i]!='L' && s[i]!='U' && s[i]!='D') {puts("No"); return 0;}
	}

	puts("Yes");

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: error: 'n' was not declared in this scope
   11 |         for(int i=0;i<n;i++){
      |                       ^
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(){
  string S;cin>>S;
  bool step=true;
  for (int i=0;i<S.size();++i){
    if (i%2==0){
      if (S[i]=='L')step=false;break;
    }
    else {
      if (S[i]=='R')step=false;break;
    }
  }
  cout<<step ? "Yes" : "No"<<endl;
}
      
  

Compiler output:
a.cc: In function 'int main()':
a.cc:15:28: error: invalid operands of types 'const char [3]' and '<unresolved overloaded function type>' to binary 'operator<<'
   15 |   cout<<step ? "Yes" : "No"<<endl;
      |                        ~~~~^~~~~~
Language: C++

#include <bits/stdc++.h>
#define IO_OP std::ios::sync_with_stdio(0); std::cin.tie(0);
#define F first
#define S second
#define V vector
#define P pair
#define PB push_back
#define MP make_pair
#define EB emplace_back
#define ALL(v) (v).begin(), (v).end()
#define debug(x) cerr << #x << " is " << x << endl
#define endl '\n'

using namespace std;

typedef long long ll;
typedef P<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7;

int32_t main()
{
	IO_OP;
	
	string s, t = "LR";
	cin >> s;
	bool ok = true;
	for(int i=0;i<s.size();i++)
		if(s[i] == t[i&1])
			ok = false;
	cout << ok ? "Yes" : "No" << endl;
}





Compiler output:
a.cc: In function 'int32_t main()':
a.cc:32:35: error: invalid operands of types 'const char [3]' and 'char' to binary 'operator<<'
   32 |         cout << ok ? "Yes" : "No" << endl;
      |                              ~~~~ ^~
      |                              |
      |                              const char [3]
Language: Java

import java.util.Scanner;

public class B {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String tapSequence = sc.next();
		sc.close();
		
		String[] sequenceArr = tapSequence.split("");
		
		boolean isEasy = true;
		
		for(int i = 0; i < sequenceArr.length ; i++) {
			String tap = sequenceArr[i];
			if((i + 1) %2 == 0) {
				if(tap.equals("R")) {
					isEasy = false;
					break;
				}
			}else {
				if(tap.equals("L")) {
					isEasy = false;
					break;
				}
			}
		}
		
		if(isEasy) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}		
	}

}


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

import java.util.Scanner;
public static void main(String[]args){
Scanner scan=new Scanner(System.in);
  String str=scan.next();
  boolean bool=true;
  for(int i=0;i<str.length();i++){
  	char ch=str.charAr(i);
    if(i%2==0){if(ch=='L')bool=false;}
    else{if(ch=='R')bool=false;}
  }
  System.out.println(bool?"Yes":"No");
}

Compiler output:
Main.java:2: error: unnamed classes are a preview feature and are disabled by default.
public static void main(String[]args){
              ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: Java

package Begineers;

import java.util.Scanner;

public class playboy
{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String s1=sc.next();
        String[] strings = new String[110];
        strings=s1.split("");
        int cnt=0;
        for (int i=0;i<s1.length();i++)
        {
            if ( i%2==0 && s1.equals("L") )
            {
                cnt=1;
                break;
            }
            if ( i%2!=0 && s1.equals("R") )
            {
                cnt=1;
                break;
            }
        }
        if (cnt==0  )
            System.out.println("YES");
        else System.out.println("NO");

    }
}


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

#include<iostream>
using namespace std;
int main(){
  string S;
  cin >> S;
  bool flag=true;
  for(int i=1; i<=S.length(); i++){
    if(i%2==1){
      if (S[i]=='L'){
        flag = false;
     	break;
      }
    }else{
      if (S[i]=='R'){
        flag = false;
     	break;
      }
  }
  if(flag == true)
   cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:2: error: expected '}' at end of input
   23 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  string S;
  cin >> S;
  bool flag=true;
  for(int i=1; i<=S.length(); i++){
    if(i%2==1){
      if (S[i]=="L"){
        flag = false;
     	break;
      }
    }else{
      if (S[i]=="R"){
        flag = false;
     	break;
      }
  }
  if(flag == true)
   cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    9 |       if (S[i]=="L"){
a.cc:14:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   14 |       if (S[i]=="R"){
a.cc:23:2: error: expected '}' at end of input
   23 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n= string S;
  cin>>S;
  //nagasa
  for(int i=0;i<n;i++){
    if(i%2==0){
      if(S.at(i)=='R'){
        cout<<"No";
      }
      else{
        if(S.at(i)=='L'){
         cout<<"No"; 
        }
      
    }  
    }
  }
    cout<<"Yes";
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:4:17: error: expected primary-expression before 'S'
    4 |   int n= string S;
      |                 ^
a.cc:5:8: error: 'S' was not declared in this scope
    5 |   cin>>S;
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string S;
  cin>>S;
  int n=string S;//nagasa
  for(i=0;i<n;i++){
    if(i%2==0){
      if(S.at(i)=='R'){
        cout<<"No";
      }
      else{
        if(S.at(i)=='L'){
         cout<<"No"; 
        }
      
    }  
    }
    cout<<"Yes";
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: expected primary-expression before 'S'
    6 |   int n=string S;//nagasa
      |                ^
a.cc:7:7: error: 'i' was not declared in this scope
    7 |   for(i=0;i<n;i++){
      |       ^
a.cc:20:4: error: expected '}' at end of input
   20 |   }
      |    ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C++

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

int main()
{
	string S;
  cin >> S;
  bool flag = false;
  
  for(int i = 0; i < S.size(); i++){
   if(i%2 == 0){
     if(S.at(i) == 'L'){
       flag = false;
     }	else {
       flag = ture;
       break;
     }
   } else{
     if(S.at(i) == 'R'){
       flag = false;
     } else {
       flag = true;
       break;
     }
   }
  }    

  if(flag)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:15: error: 'ture' was not declared in this scope
   15 |        flag = ture;
      |               ^~~~
Language: Java

import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String answer ="Yes";
    for(int i =0;i<S.length();i++){
      if(i%2==0&&S.charAt(i)=="L"){
        answer = "No";
        break;
      }else if(i%2==1&&S.charAt(i)=="R"){
        answer = "No";
        break;
      }else{
      continue;
      }
    }
    System.out.println(answer);
  }
  
  //最大公約数・最小公倍数（セットで使う）
static int gcd (int a, int b) {return b>0?gcd(b,a%b):a;}
static int lcm (int a, int b) {return a*b/gcd(a,b);}


//素数判定
static boolean isPrime (int n) {
	if (n==2) return true;
	if (n<2 || n%2==0) return false;
	double d = Math.sqrt(n);
	for (int i=3; i<=d; i+=2) if(n%i==0){return false;}
	return true;
}


//倍数判定（10進数以外のときに有用）
static boolean isMultiple (String s, int base, int m) {
	int temp = 0;
	for (int i=0; i<s.length(); i++) {
		temp = (temp*base+Character.getNumericValue(s.charAt(i)))%m;
	}
	if (temp==0) {return true;}
	return false;
}


//階乗
static long factorial (int i) {
	if (i==1) {return 1;}
	else {return i*factorial(i-1);}
}


//進数変換
static String toNbase (String sm, int m, int n) {
	return Long.toString(Long.parseLong(sm,m),n);
}
  
}

Compiler output:
Main.java:8: error: bad operand types for binary operator '=='
      if(i%2==0&&S.charAt(i)=="L"){
                            ^
  first type:  char
  second type: String
Main.java:11: error: bad operand types for binary operator '=='
      }else if(i%2==1&&S.charAt(i)=="R"){
                                  ^
  first type:  char
  second type: String
2 errors
Language: C++

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

int main() {
	string S;
	cin >> S;
	
	for (int i = 0; i < S.size(); ++i) {
    	if (i % 2 == 1 && S[i] == 'R') { 
        	cout << "No";
      		return;
    	} else if (i % 2 == 0 && S[i] == 'L') {
        	cout << "No";
        	return;
        }
    }
	cout << "Yes";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: return-statement with no value, in function returning 'int' [-fpermissive]
   11 |                 return;
      |                 ^~~~~~
a.cc:14:17: error: return-statement with no value, in function returning 'int' [-fpermissive]
   14 |                 return;
      |                 ^~~~~~
Language: C

#include<stdio.h>
int main(void)
{
	int i;
	int cnt=0;
	char S[101];
	scanf("%s",S);
	do(i=0;i<=100;i++)
	{
		if(i%2)
		{
			if(S[i]=='R' || S[i]=='U' || S[i]=='D')
			cnt=cnt+0;
			else
			cnt++;
		}
		else
		{
			if(S[i]=='L' || S[i]=='U' || S[i]=='D')
			cnt=cnt+0;
			else
			cnt++;
		}
	}while(S=='\0');
	if(cnt==0)
	printf("Yes");
	else
	printf("No");
	return 0;
}


Compiler output:
main.c: In function 'main':
main.c:8:15: error: expected ')' before ';' token
    8 |         do(i=0;i<=100;i++)
      |           ~   ^
      |               )
main.c:8:27: error: expected ';' before '{' token
    8 |         do(i=0;i<=100;i++)
      |                           ^
      |                           ;
    9 |         {
      |         ~                  
main.c:25:9: error: expected 'while' before 'if'
   25 |         if(cnt==0)
      |         ^~
main.c:27:9: error: 'else' without a previous 'if'
   27 |         else
      |         ^~~~
Language: C

#include<stdio.h>
int main(void)
{
	int i;
	char S[101];
	scanf("%s", S);
	for(i = 0; i < 99 ;i++)
	{
		if(S[2*i] == 'L' || S[i] == 'U' || S[i] == 'D' || S[(2*i)+1]== 'R')
		{printf("Yes");}
	    else if (S[(2*i)+1]=='L' || S[2*i] == 'R')
		{printf("No");}
	    else {printf("Fuck")}
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:33: error: expected ';' before '}' token
   13 |             else {printf("Fuck")}
      |                                 ^
      |                                 ;
Language: C

#include<stdio.h>
int main(void)
{
	int i;
	char S[1000];
	scanf("%s",S);
	for(i=0;i<=100;i++)
	{
		if(i%2)
		{
			if(S[i]==R||U||D)
			printf("Yes");
			else
			printf("No");
		}
		else
		{
			if(S[i]==L||U||D)
			printf("Yes");
			else
			printf("No");
		}
	}
	return 0;
}


Compiler output:
main.c: In function 'main':
main.c:11:34: error: 'R' undeclared (first use in this function)
   11 |                         if(S[i]==R||U||D)
      |                                  ^
main.c:11:34: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:37: error: 'U' undeclared (first use in this function)
   11 |                         if(S[i]==R||U||D)
      |                                     ^
main.c:11:40: error: 'D' undeclared (first use in this function)
   11 |                         if(S[i]==R||U||D)
      |                                        ^
main.c:18:34: error: 'L' undeclared (first use in this function)
   18 |                         if(S[i]==L||U||D)
      |                                  ^
Language: C

#include <stdio.h>

int main(){
    int i;
    char S[100];
    scanf("%s"S);
    if(i % 2==0){
        if(S[i]=='L' || S[i]=='U' || S[i]=='D'){
            printf("Yes\n");
        }

    }else {
        printf("No\n");
    }


    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:6:15: error: expected ')' before 'S'
    6 |     scanf("%s"S);
      |          ~    ^
      |               )
Language: C

#include <stdio.h>

int main(){
    int i;
    char S[100];

    if(i % 2==0){
        if(S[i]='L' || S[i]='U' || S[i]='D'){
            printf("Yes\n");
        }

    }else {
        printf("No\n");
    }


    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:40: error: lvalue required as left operand of assignment
    8 |         if(S[i]='L' || S[i]='U' || S[i]='D'){
      |                                        ^
Language: C++

#include<iostream>
#include<cstring>
#define FOR(i,n) for(int i=0;i<n;i++)
using namespace std;
bool a=true;
int main()
{
    ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
    string S;
    cin>>S;
     for(int i=0;i<n;i++)
    {
        if((i+1)%2!=0){
            if(S[i]=='R'||S[i]=='U'||S[i]=='D')
                continue;
            else{
                a=false;
                break;
            }
        }
        else{
            if(S[i]=='L'||S[i]=='U'||S[i]=='D')
                continue;
            else{
                  a=false;
                  break;
            }
        }
    }
    if(a)
        cout<<"YES";
        else
            cout<<"NO";
    std::cin.get();
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:20: error: 'n' was not declared in this scope
   13 |      for(int i=0;i<n;i++)
      |                    ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  for(int i=0; i < S.size(); i++){
    if(i%2==1){
      if(S.at(i)!="R"||"U"||"D"){
        cout << "No" << endl;
        break;
      }
      else{
        continue;
      }
    }
    else if(i%2==0){
      if(S.at(i)!="L"||"U"||"D"){
        cout << "No" << endl;
        break;
      }
      else{
        continue;
      }
    }
    else if(i==S.size()-1){
      cout << "Yes" << endl;
    }
  }
}
         

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    8 |       if(S.at(i)!="R"||"U"||"D"){
      |          ~~~~~~~^~~~~
a.cc:17:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   17 |       if(S.at(i)!="L"||"U"||"D"){
      |          ~~~~~~~^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  for(int i=0; i < S.size(); i++){
    if(i%2==1){
      if(S.at(i)!=R||U||D){
        cout << "No" << endl;
        break;
      }
      else{
        continue;
      }
    }
    else if(i%2==0){
      if(S.at(i)!="L"||"U"||"D"){
        cout << "No" << endl;
        break;
      }
      else{
        continue;
      }
    }
    else if(i==S.size()-1){
      cout << "Yes" << endl;
    }
  }
}
         

Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: 'R' was not declared in this scope
    8 |       if(S.at(i)!=R||U||D){
      |                   ^
a.cc:8:22: error: 'U' was not declared in this scope
    8 |       if(S.at(i)!=R||U||D){
      |                      ^
a.cc:8:25: error: 'D' was not declared in this scope
    8 |       if(S.at(i)!=R||U||D){
      |                         ^
a.cc:17:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   17 |       if(S.at(i)!="L"||"U"||"D"){
      |          ~~~~~~~^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  for(int i=0; i < S.size(); i++){
    if(i%2==1){
      if(S.at(i)!="R"||"U"||"D"){
        cout << "No" << endl;
        breal;
      }
      else{
        continue;
      }
    }
    else if(i%2==0){
      if(S.at(i)!="L"||"U"||"D"){
        cout << "No" << endl;
        break;
      }
      else{
        continue;
      }
    }
    else if(i==S.size()-1){
      cout << "Yes" << endl;
    }
  }
}
         

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    8 |       if(S.at(i)!="R"||"U"||"D"){
      |          ~~~~~~~^~~~~
a.cc:10:9: error: 'breal' was not declared in this scope
   10 |         breal;
      |         ^~~~~
a.cc:17:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   17 |       if(S.at(i)!="L"||"U"||"D"){
      |          ~~~~~~~^~~~~
Language: C++

s = gets
odd_actions = ['R', 'U', 'D']
even_actions = ['L', 'U', 'D']

sl = s.length
is_fumiyasui = true

sl.times do |i|
  step_num = i + 1
  if(step_num.odd?)
    is_fumiyasui = false unless odd_actions.include?(s[i])
  else
    is_fumiyasui = false unless even_actions.include?(s[i])
  end

  break unless is_fumiyasui
end

puts is_fumiyasui ? "Yes" : "No"


Compiler output:
a.cc:1:1: error: 's' does not name a type
    1 | s = gets
      | ^
Language: C++

#include "bits/stdc++.h"

using namespace std;

main(){
  string s;
  cin >> s;
  bool f = true;
for(int i = 0; i < s.size(); ++i){
    if(i%2==0){
        if((s[i]=='L')||(s[i]=='U')||(s[i]=='D')){
        }else{
            f = false;
            break;
        }
    }else{
        if((s[i]=='R')||(s[i]=='U')||(s[i]=='D')){
        }else{
            f = false;
            break;
        }
    }
}
  if(f){
    coun<<"Yes"<<endl;
  }else{
    coun<<"No"<<endl;
  }
}

Compiler output:
a.cc:5:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    5 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:25:5: error: 'coun' was not declared in this scope
   25 |     coun<<"Yes"<<endl;
      |     ^~~~
a.cc:27:5: error: 'coun' was not declared in this scope
   27 |     coun<<"No"<<endl;
      |     ^~~~
Language: C

#include<stdio.h>

int main(){
	char str[102];
  	int out=0;
  	fgets(str,sizeof(str),stdin);
   	for(int i=0;str[i]!='\0';i++){
      if(i%2==1){
      	if(str[i]=='R'||str[i]=='U'||str[i]=='D'){
			;     
        }else{
          out = 1;
          break;
        }
      }else{
        if(str[i]=='L'||str[i]=='U'||str[i]=='D'){
			;     
        }else{
          out = 1;
          break;
        }
      }
      if(out==0){ printf("Yes");}
      else{ printf("No");}
	  return 0; 
    }	

Compiler output:
main.c: In function 'main':
main.c:26:5: error: expected declaration or statement at end of input
   26 |     }
      |     ^
Language: C++

#include <iostream>

using namespace std;

int main(void)
{
  string steps;
  
  cin >> steps;
  
  for(int i = 0; i < steps.size(); i++){
    if(steps % 2 == 0){
      if(steps[i] == 'L'){
        cout << "No" << endl;
        return 0;
      }
    }else{
      if(steps[i] == 'R'){
        cout << "No" << endl;
        return 0;
      }
    }
  }
  
  cout << "Yes" << endl;
  
  return 0;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: no match for 'operator%' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   12 |     if(steps % 2 == 0){
      |        ~~~~~ ^ ~
      |        |       |
      |        |       int
      |        std::string {aka std::__cxx11::basic_string<char>}
Language: C++

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

int main(){
    string S;
    cin>>S;
    rep(i,0,S.size()){
        if(i%2==0){
            if(S[i]!='R'&&S[i]!='U'&&S[i]!='D') {
                cout<<"No"<<endl;
                return 0;
        }
        if(i%2!=0){
            if(S[i]!='L'&&S[i]!='U'&&S[i]!='D'){
                cout<<"No"<<endl;
                return 0;
            }
        }
    }
    cout<<"Yes"<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:2: error: expected '}' at end of input
   23 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

S= list(input())
a=[]
for i in range(0,len(S)):
  if i%2==0:
    if S[i]=="R" or S[i] == "U" or S[i]=="D":
      a.append(1)
  elif i%2!=0:
    if S[i]=="L" or S[i]=="U" or S[i]=="D":
      a.append(1)
if len(S)==sum(a):
  print("Yes")
else:
  print("No")


Compiler output:
a.cc:1:1: error: 'S' does not name a type
    1 | S= list(input())
      | ^
Language: C++

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

int main() {
	string s;
	bool t = true;
	for (int i = 0; i < s.length(); i++)
		if (i % 2 == 0 && s[i] == 'L')
			t = false;
		else if (i % 2 == 1 && s[i] == 'R')
			t = false;
	if (t == true)
		cout << "Yes";
	else
		cout << "No";
}

Compiler output:
a.cc:1:10: fatal error: bits/srdc++.h: No such file or directory
    1 | #include <bits/srdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
using namespace std;
#define df 0

int main(){
  if(df) printf("*debug mode*\n");
  int n; cin >>n;
  for(int i=0;i<n;i++){
    char a; cin >>a;
    if(i%2==0 && a==L){
      cout << "No";
      return 0;
    }
    if(i%2==1 && a==R){
      cout << "No";
      return 0;
    }
  }
      cout << "Yes";
      return 0;
}

/// confirm df==0 ///


Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: 'L' was not declared in this scope
   10 |     if(i%2==0 && a==L){
      |                     ^
a.cc:14:21: error: 'R' was not declared in this scope
   14 |     if(i%2==1 && a==R){
      |                     ^
Language: C++

/*奇数文字目がすべて R, U, D のいずれか。
偶数文字目がすべて L, U, D のいずれか。*/
#include<iostream>
#include<cstring>
using namespace std ;

int main()
{
  string S ;
  cin>>S ;
  
  for(int i=0;i<strlen(S);i++){
    if(i%2==0&&S[i]=='R'){
      cout<<"No"<<endl ;
      return 0 ;
    }else if(i%2!=0&&S[i]=='L'){
      cout<<"No"<<endl ;
      return 0 ;
    }
  }
  cout<<"Yes"<<endl ;

  return 0 ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:24: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'const char*'
   12 |   for(int i=0;i<strlen(S);i++){
      |                        ^
      |                        |
      |                        std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/cstring:43,
                 from a.cc:4:
/usr/include/string.h:407:35: note:   initializing argument 1 of 'size_t strlen(const char*)'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~