qyliang/CodeNanoFix huggingface dataset:
Buggy code:
S = input ()

even_clear = 0
odd_clear = 0
number = 1

for value in S:
    if number % 2 == 0 and  not value == "R":
        even_clear += 1
    elif  not value == "L":
        odd_clear += 1
    number += 1

if number - 1 == (even_clear + odd_clear):
    print("Yes")
else:
    print("No")

Fixed code:
S = input ()

even_clear = 0
odd_clear = 0
number = 1

for value in S:
    if number % 2 == 0 and  not value == "R":
        even_clear += 1

    elif number % 2 == 1  and not value == "L":
        odd_clear += 1
    number += 1

number_pop = number - 1

if number_pop == (even_clear + odd_clear):
    print("Yes")
else:
    print("No")
Buggy code:
g = ['R', 'U', 'D']
k = ['L', 'U', 'D']
a = input()
b = 0
for i in range(len(a)):
    if (i+1) % 2 == 0:
        if a[i] in g:
            pass
        else:
            print('No')
            b = 1
            break
    else:
        if a[i] in k:
            pass
        else:
            print('No')
            b = 1
            break
if b == 0:
    print('Yes')

Fixed code:
g = ['L', 'U', 'D']
k = ['R', 'U', 'D']
a = input()
b = 0
for i in range(len(a)):
    if (i+1) % 2 == 0:
        if a[i] in g:
            pass
        else:
            print('No')
            b = 1
            break
    else:
        if a[i] in k:
            pass
        else:
            print('No')
            b = 1
            break
if b == 0:
    print('Yes')
Buggy code:
s=input()

for i in range(len(s)):
  if i%2==0:
    if s[i]==="L":
      print("No")
      sys.exit()
      
  else:
    if s[i]=="R":
      print("No")
      sys.exit()
      
print("Yes")

    
        
      

Fixed code:
import sys

s = input()

for i in range(len(s)):
    if i%2 == 0:
        if s[i] == "L":
            print("No")
            sys.exit()
            
    else:
        if s[i] == "R":
            print("No")
            sys.exit()
print("Yes")
Buggy code:
S = input()

counter = 1
yorn = 1
for foot in S:
    if foot == 'R':
        if counter % 2 == 0:
            yorn=0
            break
    elif foot == 'L':
        if counter % 2 == 1:
            yorn = 0
            break
    counter++

if yorn == 1:
    print("Yes")
else:
    print("No")



Fixed code:
S = input()

counter = 1
yorn = 1
for foot in S:
    if foot == 'R':
        if counter % 2 == 0:
            yorn=0
            break
    elif foot == 'L':
        if counter % 2 == 1:
            yorn = 0
            break
    counter+=1

if yorn == 1:
    print("Yes")
else:
    print("No")
Buggy code:
t = 'LRUD'
s = input()
for i in range(len(s)):
  if i % 2 == 1 and s[i] == 'L':
    print('No')
    exit()
  if i % 2 == 0 and s[i] == 'R':
    print('No')
	exit()
print('Yes')

Fixed code:
t = 'LRUD'
s = input()
for i in range(len(s)):
  if (i+1) % 2 == 1 and s[i] == 'L':
    print('No')
    exit()
  if (i+1) % 2 == 0 and s[i] == 'R':
    print('No')
    exit()
print('Yes')
Buggy code:
S = input()
for i in range(len(S)):
    if i%2 == 0:
        if S[i] == 'L':
            print('No')
            break
    if i%2 == 1:
        if S[i] == 'R':
            print('No')
else: print('Yes')

Fixed code:
S = input()
for i in range(len(S)):
    if i%2 == 0:
        if S[i] == 'L':
            print('No')
            break
    if i%2 == 1:
        if S[i] == 'R':
            print('No')
            break
else: print('Yes')
Buggy code:
# coding: utf-8
def is_easy(steps):
  for i, step in enumerate(steps):
    if i % 2 == 0 and step == 'L':
      return 'No'
  	elif i % 2 == 1 and step == 'R':
      return 'No'
	return 'Yes'
  
steps = input()
print(is_easy(steps))

Fixed code:
# coding: utf-8
def is_easy(steps):
    for i, step in enumerate(steps):
        if i % 2 == 0 and step == 'L':
            return 'No'
        elif i % 2 == 1 and step == 'R':
            return 'No'
    return 'Yes'
  
steps = input()
print(is_easy(steps))
Buggy code:
s = str(input())
ans = "Yes"
for i in range(len(s)):
    if i %2 == 1:
        if s[i]=="L":
            ans = "No"
    if i %2 == 0:
        if s[i]=="R":
            ans = "No"
            
print(ans)

Fixed code:
s = str(input())

ans = "Yes"
for i in range(len(s)):
    if (i+1) %2 == 1:
        if s[i]=="L":
            ans = "No"
    if (i+1) %2 == 0:
        if s[i]=="R":
            ans = "No"         
print(ans)
Buggy code:
s=input()
a=list(s[0::2])
b=list(s[1::2])
if "R" in a or "L" in b:
    print("No")
else:
    print("Yes")

Fixed code:
s=input()
a=list(s[1::2])
b=list(s[0::2])
if "R" in a or "L" in b:
    print("No")
else:
    print("Yes")
Buggy code:
S=input()
s=list(S)

odd=[]
even=[]

for i in range(n):
  if i%2==0:
    odd.append(s[i])
  if i%2==1:
    even.append(s[i])

    
oddsum=0
evensum=0

for i in range(len(odd)):
  if odd[i]=="R" or odd[i]=="U" or odd[i]=="D":
    oddsum+=1
  else:
    oddsum+=0

for i in range(len(even)):
  if even[i]=="L" or even[i]=="U" or even[i]=="D":
    evensum+=1
  else:
    evensum=0

if oddsum==len(odd) and evensum==len(even):
  print("Yes")
else:
  print("No")

Fixed code:
S=input()
s=list(S)
 
odd=[]
even=[]
 
for i in range(len(s)):
  if i%2==0:
    odd.append(s[i])
  if i%2==1:
    even.append(s[i])
 
    
oddsum=0
evensum=0
 
for i in range(len(odd)):
  if odd[i]=="R" or odd[i]=="U" or odd[i]=="D":
    oddsum+=1
  else:
    oddsum+=0
 
for i in range(len(even)):
  if even[i]=="L" or even[i]=="U" or even[i]=="D":
    evensum+=1
  else:
    evensum=0
 
if oddsum==len(odd) and evensum==len(even):
  print("Yes")
else:
  print("No")
Buggy code:
s = input()
a = 0
n = len(s)

for i in range (n):
    if i % 2 == 0:
        if s[i] != "R":
            a=a+1
    if i % 2 == 1:
        if s[i] != "L":
            a=a+1
if a == len(s):
    print('Yes')
else:
    print('NO')

Fixed code:
s = input()
a = 0
n = len(s)

for i in range (n):
    if i % 2 == 1:
        if s[i] != "R":
            a=a+1
    if i % 2 == 0:
        if s[i] != "L":
            a=a+1
if a == len(s):
    print('Yes')
else:
    print('No')
Buggy code:
S=input()

for i in range(0,int(len(S))):
  if i%2==0:
    if S[i]=='L':
        print('No')
        break
  elif i%2==1:
    if S[i]=='R':
        print('No')
        break
  else:
    print('Yes')

Fixed code:
S=input()
ans='Yes'

for i in range(0,int(len(S))):
  if i%2==0:
    if S[i]=='L':
        ans='No'
        break
  elif i%2==1:
    if S[i]=='R':
        ans='No'
        break
print(ans)
Buggy code:
S=list(input())
l=len(S)
e=0
ki=["R","U","D"]
gu=["L","U","D"]
if l%2 ==0:
	tmp=l//2
	for i in range(tmp):
		char1=S[2*i]
		char2=S[2*i+1]
		if char1 not in ki:
			e=1

		if char2 not in gu:
			e=1


else:
	tmp=l//2
	charL=[l-1]
	if charL not in ki:
		e=1
	else:
		for i in range(tmp): 
			char1=S[2*i]
			char2=S[2*i+1]
			if char1 not in ki:
				e=1
			if char2 not in gu:
				e=1

if e==0:
	print("Yes")
else:
	print("No")



Fixed code:
S=list(input())
l=len(S)
e=0
ki=["R","U","D"]
gu=["L","U","D"]
tmp=l//2
if l%2 ==0:
	for i in range(tmp):
		char1=S[2*i]
		char2=S[2*i+1]
		if char1 not in ki:
			e=1
		if char2 not in gu:
			e=1


else:
	charL=S[l-1]
	if charL not in ki:
		e=1	

	else:
		for i in range(tmp): 
			char1=S[2*i]
			char2=S[2*i+1]
			if char1 not in ki:
				e=1
			if char2 not in gu:
				e=1

if e==0:
	print("Yes")
else:
	print("No")
Buggy code:
s = input()

for i in range(len(s)):
    if s[i] == 'R' and i % 2 == 0:
        print('No')
        exit(0)
    elif s[i] == 'L' and i % 2 == 1:
        print('No')
        exit(0)

print('Yes')

Fixed code:
s = input()
ans = 'Yes'
for i in range(len(s)):
    if i % 2 == 0 and s[i] == 'L':
        ans = 'No'
    elif i % 2 == 1 and s[i] == 'R':
        ans = 'No'
print(ans)
Buggy code:
n = input()
t = 1
for i in range(len(n)):
    if i%2==0:
        if n[i] == "R":
            t=0
            break
    else:
        if n[i]== "L":
            t = 0
            break
if t ==1:
    print("Yes")
else:print("No") 

Fixed code:
n = input()
t = 1
for i in range(len(n)):
    if i%2==0:
        if n[i] == "L":
            t=0
            break
    else:
        if n[i]== "R":
            t = 0
            break
if t ==1:
    print("Yes")
else:print("No")
Buggy code:
S = input()
if 'L' in S[1::2] or 'R' in S[0::2]:
    print('No')
else:
    print('Yes')

Fixed code:
S = input()
if 'R' in S[1::2] or 'L' in S[0::2]:
    print('No')
else:
    print('Yes')
Buggy code:
s = input()

res = True
for i in range(lens(s)):
  if i % 2 == 0 and s[i] == 'L':
    res = False
    break
  if i % 2 == 1 and s[i] == 'R':
    res = False
    break

if res:
  print("Yes")
else:
  print("No")

Fixed code:
s = input()
 
res = True
for i in range(len(s)):
  if i % 2 == 0 and s[i] == 'L':
    res = False
    break
  if i % 2 == 1 and s[i] == 'R':
    res = False
    break
 
if res:
  print("Yes")
else:
  print("No")
Buggy code:
S = input("")
a = 0
for i in range(len(S)):
    if i%2==1:
        print(S[i])
        if S[i] == 'L':
            a=a+1
        if S[i] == 'U': 
            a = a+1
        if S[i] == 'D':
            a = a+1
        else:
            a = 0
    elif i%2==0:
        if S[i] == 'R':
            a=a+1
        if S[i] == 'U': 
            a = a+1
        if S[i] == 'D':
            a = a+1
        else:
            a = 0
print(len(S))
print(a)
if len(S)==a:
    print("Yes")
else:
    print("No")

Fixed code:
S = input("")
a = 0
for i in range(len(S)):
    if i%2==1:
        if S[i] == 'L':
            a=a+1
        elif S[i] == 'U': 
            a = a+1
        elif S[i] == 'D':
            a = a+1
        else:
            a = 0
    elif i%2==0:
        if S[i] == 'R':
            a =a+1
        elif S[i] == 'U': 
            a = a+1
        elif S[i] == 'D':
            a = a+1
        else:
            a = 0
if len(S)==a:
    print("Yes")
else:
    print("No")
Buggy code:
S = input()

if all([not 'L'==i  for i in S[0::2]] and [not 'R'==i for i in S[1::2]]):
    print('Yes')
else:
    print('No')

Fixed code:
S = input()

if all([not 'L'==i  for i in S[0::2]]) and all([not 'R'==i for i in S[1::2]]):
    print('Yes')
else:
    print('No')
Buggy code:
k = ['R','U','D']
g = ['L','U','D']

s = input()
for i in range(len(s)):
  if i == 'U' or i == 'D':
    continue
  else:
    if i%2 == 0:
      if i != 'L':
        print("No")
        exit()
    else:
      if i != 'R':
        print("No")
        exit()
print("Yes")

Fixed code:
k = ['R','U','D']
g = ['L','U','D']

s = input()
for i in range(len(s)):
  if s[i] == 'U' or s[i] == 'D':
    continue
  else:
    if i%2 != 0:
      if s[i] != 'L':
        print("No")
        exit()
    else:
      if s[i] != 'R':
        print("No")
        exit()
print("Yes")
Buggy code:
S = list(input())
Flag = True
for i in range(0,len(S)):
  if i % 2 == 0:
    a = S[i]
    if Flag == True and a == 'R':
       Flag = False
  else:
    b = S[i]
    if Flag == True and b == 'L':
       Flag = False
if Flag == True:
  print('Yes')
else:
  print('No')

Fixed code:
S = list(input())
Flag = True
for i in range(0,len(S)):
  if i % 2 == 1:
    a = S[i]
    if Flag == True and a == 'R':
       Flag = False
  else:
    b = S[i]
    if Flag == True and b == 'L':
       Flag = False
if Flag == True:
  print('Yes')
else:
  print('No')
Buggy code:
s = input()
even = ['R', 'U', 'D']
odd = ['L', 'U', 'D']

for i, j in enumerate(s):
    if i % 2 == 0:
        if j not in odd:
            print('No')
            break
    else:
        if j not in even:
            printt('No')
            break
else:
    print('Yes')

Fixed code:
s = input()
even = ['R', 'U', 'D']
odd = ['L', 'U', 'D']

for i, j in enumerate(s):
    if i % 2 == 0:
        if j not in even:
            print('No')
            break
    else:
        if j not in odd:
            print('No')
            break
else:
    print('Yes')
Buggy code:
s = input()
if 'R' in s[0::2] or 'L' in s[1::2]:
    print('No')
else:
    print('Yes')

Fixed code:
s = input()
if 'L' in s[0::2] or 'R' in s[1::2]:
    print('No')
else:
    print('Yes')
Buggy code:
S = input()
S_o = S[::2]
S_e = S[1::2]
if 'L' in S_o or 'R' in _e:
    print('No')
else:
    print('Yes')

Fixed code:
S = input()
S_o = S[::2]
S_e = S[1::2]
if 'L' in S_o or 'R' in S_e:
    print('No')
else:
    print('Yes')
Buggy code:
S = input()
str_list = list(S)
even_str = str_list[0::2]
odd_str = str_list[1::2]
if ('R' in even_str):
  print('No')
elif ('L' in odd_str):
  print('No')
else:
  print('Yes')

Fixed code:
S = input()
str_list = list(S)
odd_str = str_list[0::2]
even_str = str_list[1::2]
if ('R' in even_str):
  print('No')
elif ('L' in odd_str):
  print('No')
else:
  print('Yes')
Buggy code:
D = list(input())

A, B = [D[i] for i in range(0, len(D), 2)], [D[i] for i in range(1, len(D), 2)]
iA,iB = list("RUD"),list("LUD")

for v in A:
    if v not in iA:
        print("No")
        exit(0)
print("Yes")

Fixed code:
D = list(input())

A, B = [D[i] for i in range(0, len(D), 2)], [D[i] for i in range(1, len(D), 2)]
iA,iB = list("RUD"),list("LUD")

for v in A:
    if v not in iA:
        print("No")
        exit(0)
for v in B:
    if v not in iB:
        print("No")
        exit(0)
print("Yes")
Buggy code:
Tap = input()
len_Tap = len(Tap)
count = 0

for i in range(len_Tap):
    if (i+1) % 2 == 1:
        if Tap[i] == 'R' or Tap[i] == 'U' or Tap[i] == 'D':
            count += 1
    
    else:
        if Tap[i] == 'L' or Tap[i] == 'U' or Tap[i] == 'D':
            count += 1

if count == len_Tap:
    print(Yes)

else:
    print(No)

Fixed code:
Tap = input()
len_Tap = len(Tap)
count = 0

for i in range(len_Tap):
    if (i+1) % 2 == 1:
        if Tap[i] == 'R' or Tap[i] == 'U' or Tap[i] == 'D':
            count += 1
    
    else:
        if Tap[i] == 'L' or Tap[i] == 'U' or Tap[i] == 'D':
            count += 1

if count == len_Tap:
    print('Yes')

else:
    print('No')
Buggy code:
S=list(input())
print(S)
for i,j in enumerate(S):
    if i%2==0:
        
        if j=="R"or j=="U"or j=="D":
            
            continue
        else:
            print("No")
            break
    else:
        if j=="L"or j=="U"or j=="D":
            continue
        else:
            print("No")
            break
else:
    print("Yes")
        

Fixed code:
S=list(input())

for i,j in enumerate(S):
    if i%2==0:
        
        if j=="R"or j=="U"or j=="D":
            
            continue
        else:
            print("No")
            break
    else:
        if j=="L"or j=="U"or j=="D":
            continue
        else:
            print("No")
            break
else:
    print("Yes")
Buggy code:
s = list(input())

for i in s[::2]:
    if i=='L':
        print('No')
        exit()

for i in s[1::2]:
    if i=='R':
        print('No')
        exit

print('Yes')

Fixed code:
s = list(input())

for i in s[::2]:
    if i=='L':
        print('No')
        exit()

for i in s[1::2]:
    if i=='R':
        print('No')
        exit()

print('Yes')
Buggy code:
S = input()

for i in range(len(S)):
  if i % 2 == 0:
    if S[i] == "R":
      print("No")
      exit()
  else:
    if S[i] == "L":
      print("No")
      exit()
      
print("Yes")

Fixed code:
S = input()

for i in range(len(S)):
  if i % 2 == 0:
    if S[i] == "L":
      print("No")
      exit()
  else:
    if S[i] == "R":
      print("No")
      exit()
      
print("Yes")
Buggy code:
s = input()
flag = True
for i in range(len(s)):
  if i % 2 == 0:
    if s[i] == "L":
      flag = false
      break
  else:
    if s[i] == "R":
      flag = false
      break
if flag == True:
  print("Yes")
else:
  print("No")

Fixed code:
s = input()
flag = True
for i in range(len(s)):
    if i % 2 == 0:
        if s[i] == "L":
            flag = False
            break
    else:
        if s[i] == "R":
            flag = False
            break
if flag == True:
    print("Yes")
else:
    print("No")
Buggy code:
s = input()

flag = True

for i in range(len(s)):
  if i % 2 == 1 and s[i] in ['L', 'U', 'D']:
    pass
  elif i % 2 == 1:
    print('NO')
    flag = False
    break
  
  if i % 2 == 0 and s[i] in ['R', 'U', 'D']:
    pass
  elif i % 2 == 0:
    print('No')
    flag = False
    break
    
if flag:
  print('Yes')

Fixed code:
s = input()

flag = True

for i in range(len(s)):
  if i % 2 == 1 and s[i] in ['L', 'U', 'D']:
    pass
  elif i % 2 == 1:
    print('No')
    flag = False
    break
  
  if i % 2 == 0 and s[i] in ['R', 'U', 'D']:
    pass
  elif i % 2 == 0:
    print('No')
    flag = False
    break
    
if flag:
  print('Yes')
Buggy code:
import math
import sys
from collections import deque
import heapq
import copy
import itertools
from itertools import permutations
from itertools import combinations
import bisect
def mi() : return map(int,sys.stdin.readline().split())
def ii() : return int(sys.stdin.readline().rstrip())
def i() : return sys.stdin.readline().rstrip()
s=i()
for i in range(math.ceil(s/2)):
  if not s[i]=="R" or s[i]=="U" or s[i]=="D":
    print("No")
    sys.exit()
for j in range(s//2):
  if not s[i]=="L" or s[i]=="U" or s[i]=="D":
    print("No")
print('Yes')

Fixed code:
import math
import sys
from collections import deque
import heapq
import copy
import itertools
from itertools import permutations
from itertools import combinations
import bisect
def mi() : return map(int,sys.stdin.readline().split())
def ii() : return int(sys.stdin.readline().rstrip())
def i() : return sys.stdin.readline().rstrip()
s=i()
for i in range(math.ceil(len(s)/2)):
  if not (s[2*i]=="R" or s[2*i]=="U" or s[2*i]=="D"):
    print("No")
    sys.exit()
for j in range(len(s)//2):
  if not (s[2*j+1]=="L" or s[2*j+1]=="U" or s[2*j+1]=="D"):
    print("No")
    sys.exit()
print('Yes')
Buggy code:
s = input()
a = s[::2]
b = s[1::2]

if a in "L" or b in "R":
  print("No")
else:
  print("Yes")

Fixed code:
s = input()
if 'L' in s[::2] or 'R' in s[1::2]:
    print('No')
else:
    print('Yes')
Buggy code:
s = input()
 
oddStep = ['R','U','D']
evenStep = ['L','U','D']
CNST_NO = 'No'
CNST_YES = 'Yes'
good_step = CNST_YES
 
for i in range( len( s )):
  if i % 2 == 0:
    if not ( s[ i ] in evenStep ):
      good_step = CNST_NO
  else:
    if not( s[ i ] in oddStep ):
      good_step = CNST_NO
  if good_step == CNST_NO:
    break
print( good_step )

Fixed code:
s = input()
 
oddStep = ['R','U','D']
evenStep = ['L','U','D']
CNST_NO = 'No'
CNST_YES = 'Yes'
good_step = CNST_YES
 
for i in range( len( s ) ):
  if i % 2 == 1: # 0 start
    if not ( s[ i ] in evenStep ):
      good_step = CNST_NO
  else:
    if not( s[ i ] in oddStep ):
      good_step = CNST_NO
  if good_step == CNST_NO:
    break
print( good_step )
Buggy code:
odd = [ "R", "U", "D"]
add = ["L", "U", "D"] 
ans = 1

S = input()
for i,s in enumerate(S):
  if i%2 == 0:
    if (s in add) == False:
      ans = 0
  else:
    if (s in odd) == False:
      ans = 0
      
if ans == 0:
  print("No")
else:
  print("Yes")

  

Fixed code:
odd = [ "R", "U", "D"]
add = ["L", "U", "D"] 
ans = 1
 
S = input()
for i,s in enumerate(S):
  if (i+1)%2 == 0:
    if (s in add) == False:
      ans = 0
  else:
    if (s in odd) == False:
      ans = 0
      
if ans == 0:
  print("No")
else:
  print("Yes")
Buggy code:
import sys
s=input()
l=len(s)
for i in range(0,l,2):
  if s[i]=='R':
    print('No')
    sys.exit()
for j in range(1,l,2):
  if s[j]=='L':
    print('No')
    sys.exit()
print('Yes')

Fixed code:
import sys
s=input()
l=len(s)
for i in range(0,l,2):
  if s[i]=='L':
    print('No')
    sys.exit()
for j in range(1,l,2):
  if s[j]=='R':
    print('No')
    sys.exit()
print('Yes')
Buggy code:
s = input()
arr = list(s)
if 'L' in arr[::2] or 'RDULL' in arr[1::2]:
    print('No')
else:
    print('Yes')

Fixed code:
s = input()
arr = list(s)
if 'L' in arr[::2] or 'R' in arr[1::2]:
    print('No')
else:
    print('Yes')
Buggy code:
a = input()

b =  ['R','U','D']
c =  ['L','U','D']
f= 0
for n,x in enumerate(a):
    if n%2==0 and x not in b : f = 1
    else:
        if x not in c : f = 1
def Y(a,t = 0):
    if a==t : print('YES')
    else : print('NO')
def y(a, t =0):
    if a==t : print('Yes')
    else : print('No')
y(f)

Fixed code:
a = input()

b =  ['R','U','D']
c =  ['L','U','D']
f= 0
for n,x in enumerate(a):
    if n%2==0 and x not in b : f = 1
    elif n%2==1 and x not in c : f = 1
def Y(a,t = 0):
    if a==t : print('YES')
    else : print('NO')
def y(a, t =0):
    if a==t : print('Yes')
    else : print('No')
y(f)
Buggy code:
s = input()

for i in range(s):
  if s[i] % 2 == 0 and s[i] == 'R':
    s = False
    break
  elif s[i] % 2 == 1 and s[i] == 'L':
    s = False
    break

if s:
  print('Yes')
else:
  print('No')
    

Fixed code:
s = input()

for i in range(len(s)):
  if i % 2 == 1 and s[i] == 'R':
    s = False
    break
  elif i % 2 == 0 and s[i] == 'L':
    s = False
    break

if s:
  print('Yes')
else:
  print('No')
Buggy code:


def main():
    s = input()
    print('Yes' if is_easy_to_step(s) else 'No')


def is_easy_to_step(strs):
    for i, s in enumerate(strs):
        if i % 2 == 0 and (s == 'L' or s == 'U' or s == 'D'):
            continue
        elif i % 2 != 0 and (s == 'R' or s == 'U' or s == 'D'):
            continue
        else:
            return False

    return True


if __name__ == '__main__':
    main()


Fixed code:


def main():
    s = input()
    print('Yes' if is_easy_to_step(s) else 'No')


def is_easy_to_step(strs):
    for i, s in enumerate(strs):
        if i % 2 != 0 and (s == 'L' or s == 'U' or s == 'D'):
            continue
        elif i % 2 == 0 and (s == 'R' or s == 'U' or s == 'D'):
            continue
        else:
            return False

    return True


if __name__ == '__main__':
    main()
Buggy code:
s=input()
flag=True
for i in range(len(s)):
  if i%2==0 and s[i]=='L':
    flag=False
    break
  if i%2==1 and s[i]=='R':
    flag=True
    break
if flag:
  print("Yes")
else:
  print("No")



Fixed code:
s=input()
flag=True
for i in range(len(s)):
  if i%2==0 and s[i]=='L':
    flag=False
    break
  if i%2==1 and s[i]=='R':
    flag=False
    break
if flag:
  print("Yes")
else:
  print("No")
Buggy code:
s=str(input())
ans="YES"
for i in range(len(s)):
    if i%2==0:
        if s[i]=="L":
            ans="No"
            break
    else:
        if s[i]=="R":
            ans="No"
            break
print(ans)

Fixed code:
s=str(input())
ans="Yes"
for i in range(len(s)):
    if i%2==0:
        if s[i]=="L":
            ans="No"
            break
    else:
        if s[i]=="R":
            ans="No"
            break
print(ans)
Buggy code:
def resolve():
    S = input()
    odd_flag = True

    for s in S:
        if odd_flag:
            if s == 'R' or s == 'U' or s == 'D':
                break
            else:
                print('No')
                return
        else:
            if s == 'L' or s == 'U' or s == 'D':
                break
            else:
                print('No')
                return

    print('Yes')

if __name__ == "__main__":
    resolve()

Fixed code:
def resolve():
    S = input()
    odd_flag = True

    for s in S:
        if odd_flag:
            if not (s == 'R' or s == 'U' or s == 'D'):
                print('No')
                return
        else:
            if not (s == 'L' or s == 'U' or s == 'D'):
                print('No')
                return
        odd_flag = not(odd_flag)

    print('Yes')

if __name__ == "__main__":
    resolve()
Buggy code:
odd = ['R','U','D']
even = ['L', 'U', 'D']
S = input()
for s in S[::2]:
  if s not in even:
    print('No')
    break
    
for s in S[1::2]:
  if s not in odd:
    print('No')
    break
    
print('Yes')

Fixed code:
odd = ['R','U','D']
even = ['L', 'U', 'D']
S = input()
for s in S[::2]:
  if s not in odd:
    print('No')
    exit()
    
for s in S[1::2]:
  if s not in even:
    print('No')
    exit()
    
print('Yes')
Buggy code:
s=input()
for i in range(len(s)):
  if i%2==0:
    if s[i]=="L":
      print("NO")
      break
  else:
    if s[i]=="R":
      print("No")
      break
else:
  print("Yes")

Fixed code:
s=input()
for i in range(len(s)):
  if i%2==0:
    if s[i]=="L":
      print("No")
      break
  else:
    if s[i]=="R":
      print("No")
      break
else:
  print("Yes")