qyliang/CodeNanoFix huggingface dataset:
Buggy code:
import math
N = int(input())

def order2(x):
  if x > 0 :
    k = 0
    check = 0
    while check == 0 :
      s = 0
      for i in range(0, k+1, 2):
        s += (-2)**i
        ans = i
      if s >= x:
        check = 1
      k += 2
  elif x < 0 :
    k = 1
    check = 0
    while check == 0 :
      s = 0
      for i in range(1, k+1, 2):
        s += (-2)**i
        ans = i
      if s <= x:
        check = 1
      k += 2
  return ans

if N!= 0 :


  l = [] 
  a = N
  i = order2(N)
  while i >= 0:
    if a == 0 :
      l.append(0)
    if a > 0 and (-2)**i >0 :
        s = 0
        for j in range(0, i, 2):
          s += (-2)**j
        print(a,s)
        if a > s :
          l.append('1')
          a -= (-2)**i
        else :
          l.append('0')
    elif a > 0 and (-2)**i < 0:
        l.append('0')
    elif a < 0 and (-2)**i > 0:
        l.append('0')
    elif a < 0 and (-2)**i < 0:
        s = 0
        for j in range(1, i, 2):
          s += (-2)**j
        if a < s :
          l.append('1')
          a -= (-2)**i
        else :
          l.append('0')
    i -= 1

  print(''.join(l))

else :
  print(0)

Fixed code:
N = int(input())

def order2(x):
  if x > 0 :
    k = 0
    check = 0
    while check == 0 :
      s = 0
      for i in range(0, k+1, 2):
        s += (-2)**i
        ans = i
      if s >= x:
        check = 1
      k += 2
  elif x < 0 :
    k = 1
    check = 0
    while check == 0 :
      s = 0
      for i in range(1, k+1, 2):
        s += (-2)**i
        ans = i
      if s <= x:
        check = 1
      k += 2
  return ans

if N!= 0 :


  l = [] 
  a = N
  i = order2(N)
  while i >= 0:
    if a == 0 :
      l.append('0')
    if a > 0 and (-2)**i >0 :
        s = 0
        for j in range(0, i, 2):
          s += (-2)**j
        if a > s :
          l.append('1')
          a -= (-2)**i
        else :
          l.append('0')
    elif a > 0 and (-2)**i < 0:
        l.append('0')
    elif a < 0 and (-2)**i > 0:
        l.append('0')
    elif a < 0 and (-2)**i < 0:
        s = 0
        for j in range(1, i, 2):
          s += (-2)**j
        if a < s :
          l.append('1')
          a -= (-2)**i
        else :
          l.append('0')
    i -= 1

  print(''.join(l))

else :
  print(0)
Buggy code:
N=int(input())
div=2
ite=1
ans=0
while(abs(N)>1):
    if abs(N) % 2 !=0:
        ans+=10**(ite-1)
    N=N//2
    ite*=2

print(ans)


Fixed code:
N = int(input())
ite = 0
ans = 0
while(abs(N) > 0):
    if abs(N) % 2 != 0:
        ans += 10 ** ite
        if ite % 2 == 0:
            N -= 1
        else:
            N += 1
    N = N//2
    ite += 1

print(ans)
Buggy code:
n = int(input())
s = ""

while n != 0:
  s = str(n%(-2)) + s
  n = n // (-2)
  
if s == "":
  print("0")
else:
  print(s)

Fixed code:
n = int(input())
s = ""

while n != 0:
  if n % (-2) == 0:
    s = "0" + s
  else:
    s = "1" + s
    n -= 1
  n = n / (-2)
  
if s == "":
  print("0")
else:
  print(s)
Buggy code:
import sys

def main():
  input = sys.stdin.readline
  N = int(input())
  ans = ''
  while N != 0:
    if N % 2 == 0:
      ans = '0' + ans
      N //= -2
    else:
      ans = '1' + ans
      N = (N - 1) // -2
  print(ans)


if __name__ == '__main__':
  main()

Fixed code:
import sys

def main():
  input = sys.stdin.readline
  N = int(input())
  ans = ''
  if N == 0:
    ans = '0'
  else:
    while N != 0:
      if N % 2 == 0:
        ans = '0' + ans
        N //= -2
      else:
        ans = '1' + ans
        N = (N - 1) // -2
  print(ans)


if __name__ == '__main__':
  main()
Buggy code:
from sys import stdin
stdin = open('sample.txt')


def main():
    N = int(stdin.readline().rstrip())

    if N == 0:
        print('0')
        return

    ans = ''
    base = 2
    while N != 1:
        ans = str(abs(N % base)) + ans
        N = N // base
        N = -1 * N
    print('1' + ans)


if __name__ == '__main__':
    main()


Fixed code:
from sys import stdin


def main():
    N = int(stdin.readline().rstrip())

    if N == 0:
        print('0')
        return

    ans = ''
    base = 2
    while N != 1:
        ans = str(abs(N % base)) + ans
        N = N // base
        N = -1 * N
    print('1' + ans)


if __name__ == '__main__':
    main()
Buggy code:
n = int(input())

if N == 0:
    print(0)
    exit()

s = ""
while n != 0:
    s += str(n%2)
    n = (n-n%2)//(-2)

print(s[::-1])

Fixed code:
n = int(input())

if n == 0:
    print(0)
    exit()

s = ""
while n != 0:
    s += str(n%2)
    n = (n-n%2)//(-2)

print(s[::-1])
Buggy code:
N = int(input())
res = []
for i in range(32):
    digit = (-2) ** i
    if N % (digit * (-2)) != 0:
        N -= digit
        res.append('1')
    else:
        res.append('0')
while res[-1] == '0':
    res.pop()
print(''.join(res[::-1]))

Fixed code:
N = int(input())
if N == 0:
    print('0')
    exit()
res = []
for i in range(32):
    digit = (-2) ** i
    if N % (digit * (-2)) != 0:
        N -= digit
        res.append('1')
    else:
        res.append('0')
while res[-1] == '0':
    res.pop()
print(''.join(res[::-1]))
Buggy code:
n = int(input())
li = []
res = n % (-2)
ans = n // (-2)
li.append(res)
p = 0
while p == 0:
  res = ans % (-2)
  ans = ans // (-2)
  li.append(res)
  if ans == 0 or ans == 1:
    p = 1
    if ans == 1:
      li.append(ans)
li = [str(n) for n in li]
pr = ""
for i in range(len(li)):
  pr += li[-1-i]
print(pr)

Fixed code:
n = int(input())
li = []
res = n % (-2)
ans = n // (-2)
ans1 = n
if res != 0:
    res = ans1 - (-2) * (ans + 1)
    ans = ans + 1
ans1 = ans
li.append(res)
p = 0
if ans == 0 or ans == 1:
    p = 1
    if ans == 1:
      li.append(ans)
while p == 0:
  res = ans % (-2)
  ans = ans // (-2)
  if res != 0:
      res = ans1 - (-2) * (ans + 1)
      ans = ans + 1
  ans1 = ans
  li.append(res)
  if ans == 0 or ans == 1:
    p = 1
    if ans == 1:
      li.append(ans)
li = [str(n) for n in li]
pr = ""
for i in range(len(li)):
  pr += li[-1-i]
print(pr)
Buggy code:
n=int(input())
ans=[]
memo=1
while n!=0:
   if abs(n)%2==1:
      ans.append("1")
      n-=memo
   else:
      ans.append("0")
   n//=2
   memo*=-1
print("".join(ans[::-1]))

Fixed code:
n=int(input())
ans=[]
memo=1
if n==0:
  print(0)
else:
  while n!=0:
    if abs(n)%2==1:
      ans.append("1")
      n-=memo
    else:
      ans.append("0")
    n//=2
    memo*=-1
  print("".join(ans[::-1]))
Buggy code:
import sys
n = int(input())
s=[]
i=0
if n==0:
  print(0)
  sys.exit()
while n > 0:
  if n%(2**(i+1))!=0:
    a=1
  else:
    a=0
  s.append(a)
  n=n-a*(-2)**i
  i+=1

s.reverse()
m=""
for ss in s:
  m+=str(ss)
print(m)

Fixed code:
import sys
n = int(input())
s=[]
i=0
if n==0:
  print(0)
  sys.exit()
while n != 0:
  if n%(2**(i+1))!=0:
    a=1
  else:
    a=0
  s.append(a)
  n=n-a*(-2)**i
  i+=1

s.reverse()
m=""
for ss in s:
  m+=str(ss)
print(m)
Buggy code:
import math
import sys

N = int(input())
max = math.ceil(math.log(abs(N), 2)) + 3

result = []
numerator = N
for i in range(0, max):
    if numerator % (math.pow(2, i + 1)) == 0:
        result.append(str(0))
    else:
        result.append(str(1))
        numerator -= math.pow(-2, i)

    if numerator == 0:
        break
result.reverse()
print("".join(result))

Fixed code:
import math
import sys

N = int(input())
if N == 0:
    max = 1
else:
    max = math.ceil(math.log(abs(N), 2)) + 3

result = []
numerator = N
for i in range(0, max):
    if numerator % (math.pow(2, i + 1)) == 0:
        result.append(str(0))
    else:
        result.append(str(1))
        numerator -= math.pow(-2, i)

    if numerator == 0:
        break
result.reverse()
print("".join(result))
Buggy code:
N = int(input())
s = ''
while(N!=0):
    if(N%2==1):
        s='1'+s
        N-=1
    else:
        s='0'+s
    N//=-2
print(s)


Fixed code:
N = int(input())

ans = 0
if N != 0:
    s = ''
    while N != 0:
        if N % 2 != 0:
            N -= 1
            s = '1' + s
        else:
            s = '0' + s
        N //= -2
    ans = s

print(ans)
Buggy code:
def main():
    N = int(input())
    ans = ''
    base = 1
    while N != 0:
        if N % (base * -2) == 0:
            ans += '0'
        else:
            ans += "1"
            N -= base
        base *= -2
    ans = list(ans)
    ans.reverse()
    print(''.join(ans))

if __name__ == "__main__":
    main()

Fixed code:
def main():
    N = int(input())
    if N == 0:
        print(0)
    ans = ''
    base = 1
    while N != 0:
        if N % (base * -2) == 0:
            ans += '0'
        else:
            ans += "1"
            N -= base
        base *= -2
    ans = list(ans)
    ans.reverse()
    print(''.join(ans))

if __name__ == "__main__":
    main()
Buggy code:
n = int(input())

a = []
while n != 0:
    if n%2 == 0:
        a.append(0)
    else:
        a.append(1)
        n -= 1
    n//=(-2)
    
if n == 0:
    print(0)
else:
    print(''.join(map(str, a[::-1])))

Fixed code:
n = int(input())

if n == 0:
    print(0)
    
else:
    a = []
    while n != 0:
        if n%2 == 0:
            a.append(0)
        else:
            a.append(1)
            n -= 1
        n//=(-2)
    
    print(''.join(map(str, a[::-1])))
Buggy code:
N = int(input().strip())

ans = []

while abs(N) > 0:
    ans.append(abs(N) % 2)
    if N > 0:
        N //= 2
    else:
        N = (N // 2) * -1

if not len(ans):
    ans = [0]

[print(i, end='') for i in ans[::-1]]
print('')

Fixed code:
N = int(input().strip())

ans = []

while abs(N) > 0:
    ans.append(abs(N) % 2)
    N = (N // 2) * -1

if not len(ans):
    ans = [0]

[print(i, end='') for i in ans[::-1]]
print('')
Buggy code:
n=int(input())
ans=str()
while(n):
    if(n%2==0):
        ans="0"+ans
    else:
        ans="1"+ans
        n-=1
    n//=-2
print(ans)

Fixed code:
n=int(input())
ans=str()
while(n):
    if(n%2==0):
        ans="0"+ans
    else:
        ans="1"+ans
        n-=1
    n//=-2
if(ans):
    print(ans)
else:
    print(0)
Buggy code:
N = int(input())
s = ''

while N != 0:
    print(N, s, N % (-2) == 0)
    if N % (-2) == 0:
        s = '0' + s
    else:
        s = '1' + s
        N -= 1
    N /= (-2)

if s =='':
    s = '0'
print(s)

Fixed code:
N = int(input())
s = ''

while N != 0:
#    print(N, s, N % (-2) == 0)
    if N % (-2) == 0:
        s = '0' + s
    else:
        s = '1' + s
        N -= 1
    N /= (-2)

if s =='':
    s = '0'
print(s)
Buggy code:
N = int(input())

if N == '':
    print('0')
    exit()

ret = ''
base = 1
while N != 0:
    if N % (base * 2):
        ret = '1' + ret
        N -= base
    else:
        ret = '0' + ret
    base *= -2

print(ret)


Fixed code:
N = int(input())

if N == 0:
    print('0')
    exit()

ret = ''
base = 1
while N != 0:
    if N % (base * 2):
        ret = '1' + ret
        N -= base
    else:
        ret = '0' + ret
    base *= -2

print(ret)
Buggy code:
n = int(input())
ans = []
i=2
j=0
k = 0
while True:
    if k==n:
        break
    if (n-k)%i==0:
        ans.append(0)
    else:
        k += i>>1 if j%2==0 else -i>>1
        ans.append(1)
    print(k)
    i = i<<1
    j+=1
for i in ans[::-1]:
    print(i,end='')
print()

Fixed code:
n = int(input())
ans = []
i=2
j=0
k = 0
while True:
    if k==n:
        break
    if (n-k)%i==0:
        ans.append(0)
    else:
        k += i>>1 if j%2==0 else -i>>1
        ans.append(1)
    i = i<<1
    j+=1

if n==0:
    print(0)
else:
    for i in ans[::-1]:
        print(i,end='')
    print()
Buggy code:
def base2_number(n):
    result = ""
    while True:
        print(n)
        rem = n % 2
        if rem:
            n -= 1
        n = n // -2
        result += str(abs(rem))
        if n == 0:
            break
    return int(result[::-1])
n = int(input())
print(base2_number(n))


Fixed code:
def base2_number(n):
    result = ""
    while True:
        rem = n % 2
        if rem:
            n -= 1
        n = n // -2
        result += str(abs(rem))
        if n == 0:
            break
    return int(result[::-1])
n = int(input())
print(base2_number(n))
Buggy code:
def convert_base(n):
    temp = n
    out = ''
    while temp != 0:
        q, r = divmod(temp, -2)
        if r == -1:
            q += 1
            r = 1
        out = str(r) + out
        temp = q
    return out

N = int(input())

print(convert_base(N))


Fixed code:
def convert_base(n):
    temp = n
    out = ''
    if n == 0:
        return '0'
    while temp != 0:
        q, r = divmod(temp, -2)
        if r == -1:
            q += 1
            r = 1
        out = str(r) + out
        temp = q
    return out

N = int(input())

print(convert_base(N))
Buggy code:
n = int(input())
 
ans = ''
while n != 0:
  if n%2 != 0:
    n -= 1
    ans = '1' + ans
  else:
    ans = '0' + ans
  n = n//(-2)
  
print(ans)

Fixed code:
n = int(input())

ans=""

while(n!=0):
  if(n%2==0):
    ans = "0"+ans 
  else:
    n=n-1
    ans = "1"+ans
  n= n/-2

if(ans==""):
  ans="0"

print(ans)
Buggy code:
n = int(input())
b = -2

remains = []
while n != 0:
    remain = n%b
    n = n//b
    
    if remain<0:
        remain += -b
        n += 1
    remains.append(remain)

remains = list(map(str,remains))
ans = ''.join(remains)[::-1]
print(ans)

Fixed code:
n = int(input())
b = -2

remains = []
if n == 0:
    print(0)
else:
    while n != 0:
        remain = n%b
        n = n//b

        if remain<0:
            remain += -b
            n += 1
        remains.append(remain)

    remains = list(map(str,remains))
    ans = ''.join(remains)[::-1]
    print(ans)
Buggy code:
n=int(input())
ans=""
while n!=0:
  ans=str(n%(2))+ans
  n=-(n//(2))
print(ans)


Fixed code:
n=int(input())
ans=""
while n!=0:
  ans=str(n%(2))+ans
  n=-(n//(2))
print(0 if ans =="" else ans)
Buggy code:
import math
N = int(input())

def minus_2(n):
    ans = ''
    if n == 1:
        ans.append('1')
    else:
        while n != 1:
            if n % -2 == 0:
                ans += '0'
            else:
                ans += '1'
            n = math.ceil(n/-2)
        ans += '1'
        ans = ans[::-1]
        
    return ans

ans = minus_2(N)

print(''.join(ans))

Fixed code:
import math
N = int(input())
 
def minus_2(n):
    ans = ''
    if n == 1:
        ans += '1'
    elif n == 0:
        ans += '0'
    else:
        while n != 1:
            if n % 2 == 0:
                ans += '0'
            else:
                ans += '1'
            n = math.ceil(n/-2)
        ans += '1'
        ans = ans[::-1]
        
    return ans
 
print(minus_2(N))
Buggy code:
import sys

N = int(input())

k = 0
S = []
while 1:
    print(k, N)
    if N % 2 == 0:
        S.append(0)
    else:
        N -= (-1) ** k
        S.append(1)
    N /= 2
    k += 1
    if N == 0:
        break

for i in S[::-1]:
    sys.stdout.write(str(i))
sys.stdout.write('\n')


Fixed code:
import sys

N = int(input())

k = 0
S = []
while 1:
    if N % 2 == 0:
        S.append(0)
    else:
        N -= (-1) ** k
        S.append(1)
    N /= 2
    k += 1
    if N == 0:
        break

for i in S[::-1]:
    sys.stdout.write(str(i))
sys.stdout.write('\n')
Buggy code:
n=int(input())
if n==0:
  print(0)
  exit()
if n==1:
  print(1)
  exit()
ans=[]
while n!=1:
  r=n%(-2)
  ans.append(str(r))
  n=(n-r)//(-2)
ans.append(str(1))
ans.reverse()
print(''.join(ans))
      

Fixed code:
n=int(input())
if n==0:
  print(0)
  exit()
if n==1:
  print(1)
  exit()
ans=[]
while n!=1:
  r=n%2
  ans.append(str(r))
  n=(n-r)//(-2)
ans.append(str(1))
ans.reverse()
print(''.join(ans))
Buggy code:
from sys import stdin
N = int(stdin.readline().rstrip())

S = ""

while N != 0:
    if N % (-2) == 0:
        S = "0" + S
    else:
        S = "1" + S
        N -= 1
    N = N / (-2)

if N == 1:
    S = "0"

print(S)

Fixed code:
from sys import stdin
N = int(stdin.readline().rstrip())

S = ""

if N == 0:
    print(0)
    
else:
    while N != 0:
        if N % (-2) == 0:
            S = "0" + S
        else:
            S = "1" + S
            N -= 1
        N = N / (-2)
    print(S)
Buggy code:
n = int(input())
s = ''
while(n != 0):
  bit = abs(n) % 2
  s = str(bit) + s
  n -= bit
  n //= -2
print(s)
  

Fixed code:
n = int(input())
s = ''
if (n == 0):
  s = '0'
while(n != 0):
  bit = abs(n) % 2
  s = str(bit) + s
  n -= bit
  n //= -2
print(s)
Buggy code:
x=int(input())

LIST2=[1]
LIST2X=[-2]

N=1
for i in range(1,30):
    N=N+4**i
    LIST2.append(N)
N=-2
for i in range(1,30):
    N=N-2*4**i
    LIST2X.append(N)



LIST=[0]*60

def nex(N):
    if N>0:
        for i in range(30):
            if N<=LIST2[i]:
                break
        LIST[i*2]+=1
        return N-(-2)**(i*2)

    if N<0:
        for i in range(30):
            if N>=LIST2X[i]:
                break
        LIST[i*2+1]+=1
        return N-(-2)**(i*2+1)

while x!=0:
    x=nex(x)
    print(x)

for i in range(59,-1,-1):
    if LIST[i]==1:
        break

for j in range(i,-1,-1):
    print(LIST[j],end="")
            

        


Fixed code:
x=int(input())

LIST2=[1]
LIST2X=[-2]

N=1
for i in range(1,30):
    N=N+4**i
    LIST2.append(N)
N=-2
for i in range(1,30):
    N=N-2*4**i
    LIST2X.append(N)



LIST=[0]*60

def nex(N):
    if N>0:
        for i in range(30):
            if N<=LIST2[i]:
                break
        LIST[i*2]+=1
        return N-(-2)**(i*2)

    if N<0:
        for i in range(30):
            if N>=LIST2X[i]:
                break
        LIST[i*2+1]+=1
        return N-(-2)**(i*2+1)

while x!=0:
    x=nex(x)
    #print(x)

for i in range(59,-1,-1):
    if LIST[i]==1:
        break

for j in range(i,-1,-1):
    print(LIST[j],end="")
Buggy code:
import sys

N = int(input())

if(N == 0):
    print(0)
    sys.exit()

ans = ""
while(N != 0):
    if(N % 2 == 0):
        ans = "0" + ans
    else:
        ans = "1" + ans
    N = N // (-2)
    # N = -1 * k

print(ans)

Fixed code:
import sys

N = int(input())

if(N == 0):
    print(0)
    sys.exit()

ans = ""
while(N != 0):
    if(N % 2 == 0):
        ans = "0" + ans
    else:
        ans = "1" + ans
    k = N // 2
    N = -1 * k

print(ans)
Buggy code:
n = int(input())
s=""
t=-2
while n != 0:
  z = 0 if n % t ==0 else 1
  s = s + str(z)
  n = n - z*t/(-2)
  t = t*(-2)
print(s)


Fixed code:
n = int(input())
if n==0:
  print("0")
  exit()
s=""
t=-2
while n != 0:
  z = 0 if n % t ==0 else 1
  s = str(z)+s
  n = n - z*t/(-2)
  t = t*(-2)
print(s)
Buggy code:
n=int(input())
ans,i="",0
while n!=0:
  if (n-(-2)**i)%((-2)**(i+1))==0:ans="1"+ans;n-=(-2)**i
  else:ans="0"+ans
  i+=1
print(int(ans))

Fixed code:
n=int(input())
if n==0:print(0);exit()
ans,i="",0
while n!=0:
  if (n-(-2)**i)%((-2)**(i+1))==0:ans="1"+ans;n-=(-2)**i
  else:ans="0"+ans
  i+=1
print(int(ans))
Buggy code:
N=int(input())
S=""
i=0
while(N):
    if (N-(-2)**i)%2**(i+1)==0:
        S+="1"
        N-=(-2)**i
    else:
        S+="0"
    i+=1
S=S[::-1]
I=False
t=0
for i in S:
    if i=="1":
        break
    else:
        t+=1
print(S[t:])


Fixed code:
N=int(input())
if N==0:
    print(0)
    quit()
S=""
i=0
while(N):
    if (N-(-2)**i)%2**(i+1)==0:
        S+="1"
        N-=(-2)**i
    else:
        S+="0"
    i+=1
S=S[::-1]
I=False
t=0
for i in S:
    if i=="1":
        break
    else:
        t+=1
print(S[t:])
Buggy code:
n = int(input())

ans = []
while n != 0:
    if n % -2 == -1:
        n -= 1
        ans += ['1']
    else:
        ans += ['0']
    n //= -2
ans.reverse()
print(''.join(ans))

Fixed code:
n = int(input())

ans = []
while n != 0:
    if n % -2 == -1:
        n -= 1
        ans += ['1']
    else:
        ans += ['0']
    n //= -2
ans.reverse()
if len(ans) == 0:
    print(0)
else:
    print(''.join(ans))
Buggy code:
N = int(input())

ans = []
while N != 0:
    ans.append(N % 2)
    N = (N - N % 2) // -2

print(''.join(map(str, reversed(ans))))


Fixed code:
N = int(input())

ans = []
while N != 0:
    ans.append(N % 2)
    N = (N - N % 2) // -2

if ans == []:
    ans =[0]

print(''.join(map(str, reversed(ans))))
Buggy code:
N = float(input())

q = N
r_s = []
while q!=1:
  hoge = (q-1) / (-2)
  if hoge.is_integer():
    r = int(1)
    q = float(hoge)
  else:
    r = int(0)
    q = float(q/(-2))
  
  r_s = r_s.append(r)
r_s = r_s[::-1]
for i in range(r_s):
  print(i, end="")


Fixed code:
N = float(input())

if N==0:
  print(0)
else:
  q = N
  r_s = []

  while q!=1:
    hoge = (q-1) / (-2)
    if hoge.is_integer():
      r = int(1)
      q = float(hoge)
    else:
      r = int(0)
      q = float(q/(-2))
  
    r_s.append(r)
  r_s.append(1)
  r_s = r_s[::-1]

  for i in range(len(r_s)):
    print(r_s[i], end="")
Buggy code:
N = int(input())
quat=[]

while N>0:
    quat.append(N%4)
    N//=4
quat.append(0)

ans = [0]*(2*len(quat)+2)

for i in range(len(quat)):
    if quat[i]<=1:
        ans[2*i]=quat[i]
    elif quat[i]<=3:
        ans[2*i]=quat[i]%2
        ans[2*i+1]=1
        quat[i+1]+=1
    else:
        quat[i+1]+=1

ansstr=''

i=len(ans)-1

while ans[i]==0:
    i-=1
    if i==-1:
        break

while i>=0:
    ansstr += str(ans[i])
    i-=1


if len(ansstr)>0:
    print(ansstr)
else:
    print(0)





Fixed code:
N = int(input())
quat=[]

addstr=''
if N<0:
    addstr=str(N%2)
    N-=N%2
    N//=-2

while N>0:
    quat.append(N%4)
    N//=4
quat.append(0)

ans = [0]*(2*len(quat)+2)

for i in range(len(quat)):
    if quat[i]<=1:
        ans[2*i]=quat[i]
    elif quat[i]<=3:
        ans[2*i]=quat[i]%2
        ans[2*i+1]=1
        quat[i+1]+=1
    else:
        quat[i+1]+=1

ansstr=''

i=len(ans)-1

while ans[i]==0:
    i-=1
    if i==-1:
        break

while i>=0:
    ansstr += str(ans[i])
    i-=1


if len(ansstr)>0:
    print(ansstr+addstr)
else:
    print(0)
Buggy code:
def main():
    N = int(input())
    if N == 0:
        return '1'
    l = []
    while N:
        l.insert(0, str(-(N % (-2))))
        if l[0] == '1':
            N -= 1
        N = N // -2
    print("".join(l))

if __name__ == "__main__":
    main()


Fixed code:
def main():
    N = int(input())
    if N == 0:
        print('0')
    l = []
    while N:
        l.insert(0, str(-(N % (-2))))
        if l[0] == '1':
            N -= 1
        N = N // -2
    print("".join(l))

if __name__ == "__main__":
    main()
Buggy code:
N = int(input())

x=0
s=""

while N!=0:
    x=int(N%2)
    s=str(x)+s
    N=(N-x)/-2
print(s)

Fixed code:
N = int(input())
x=0
s=""
while N!=0:
    x=int(N%2)
    s=str(x)+s
    N=(N-x)/-2

if(s==""):
    print("0")
else:
    print(s)
Buggy code:
n = int(input())
ans = str()
i = 0
while n != 0:
  b = n%2
  if (b==1 or b== -1):
    ans = "1" + ans
  else:
    ans = "0" + ans
  n -= abs(b) *(-1) ** (i)
  n = n//2
  i += 1
print(ans)

Fixed code:
n = int(input())
ans = str()
if n == 0:
  ans = 0
i = 0
while n != 0:
  b = n%2
  if (b==1 or b== -1):
    ans = "1" + ans
  else:
    ans = "0" + ans
  n -= abs(b) *(-1) ** (i)
  n = n//2
  i += 1
print(ans)
Buggy code:
import math
n = int(input())
x = []

if n == 0:
    print(0)
else:
    if n > 0:
        a = math.ceil(math.log2(n * 3 + 1) / 2) 
        b = 2 * a - 1
        print(b)
        x = [[]] * (b)
        print(x)
    else:
        a = math.ceil(math.log2((-3 * n + 2) / 2) / 2)
        b = 2 * a
        x = [[]] * (b)
        print(x)
    while n != 0:
        if n > 0:
            a = math.ceil(math.log2(n * 3 + 1) / 2) 
            b = 2 * a - 1 
            n = n - (2) ** (b-1)
            print(n)
            print(b-1)
            x[-b] = "1"  
        else:
            a = math.ceil(math.log2((-3 * n + 2) / 2) / 2)
            b = 2 * a
            n = n - (-2) ** (b-1)
            print(n)
            print(b-1)
            x[-b] = "1"
print(x)
x_replace = ["0" if i != "1" else i for i in x]
x_replace = "".join(x_replace)
print(x_replace)

Fixed code:
import math
n = int(input())
x = []

if n == 0:
    print(0)
else:
    if n > 0:
        a = math.ceil(math.log2(n * 3 + 1) / 2) 
        b = 2 * a - 1
        x = [[]] * (b)
    else:
        a = math.ceil(math.log2((-3 * n + 2) / 2) / 2)
        b = 2 * a
        x = [[]] * (b)
    while n != 0:
        if n > 0:
            a = math.ceil(math.log2(n * 3 + 1) / 2) 
            b = 2 * a - 1 
            n = n - (2) ** (b-1)
            x[-b] = "1"  
        else:
            a = math.ceil(math.log2((-3 * n + 2) / 2) / 2)
            b = 2 * a
            n = n - (-2) ** (b-1)
            x[-b] = "1"
x_replace = ["0" if i != "1" else i for i in x]
x_replace = "".join(x_replace)
print(x_replace)