qyliang/CodeNanoFix huggingface dataset:
Buggy code:
s = input()
def f(n):
  if n%2 == 0:
    return n/2
  else:
    return 3*n+1
a = []
a.append(s)
for i in range(1,1000001):
  if f(a[i-1]) in a:
    print(i)
    break
  else:
    a.append(f(a[i-1]))
  

Fixed code:
s = int(input())
def f(n):
  if n%2 == 0:
    return n/2
  else:
    return 3*n+1
a = []
a.append(s)
for i in range(1,1000001):
  if f(a[i-1]) in a:
    print(i+1)
    break
  else:
    a.append(f(a[i-1]))
Buggy code:
s = int(input())
l = [s]

while 1:
  if s %2 == 0:
    l.append(s/2)
    s = s/2
  else:
    l.append(3*s + 1)
    s = 3*s+1
  
  if any(l.count(i) >= 2 for i in range(1000001)):
    print(len(l))
    break

Fixed code:
s = int(input())
l = [s]
max=s

while 1:
  if s %2 == 0:
    l.append(s/2)
    s = int(s/2)
  else:
    l.append(3*s + 1)
    s = 3*s+1
    max = s
  
  if any(l.count(i) >= 2 for i in range(s+1)):
    print(len(l))
    break
Buggy code:
# -*- coding: utf-8 -*-


def fn(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3*n + 1


def main():
    """Function."""
    s = int(input())

    check_dic = {}
    check = set()

    old = s
    counter = 1

    while old not in check:
        print(old,counter)
        check.add(old)
        check_dic[old] = counter

        counter += 1
        old = fn(old)

    print("!!!!!!!!!!!")
    print(counter)


if __name__ == "__main__":
    main()

Fixed code:
# -*- coding: utf-8 -*-


def fn(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3*n + 1


def main():
    """Function."""
    s = int(input())

    check_dic = {}
    check = set()

    old = s
    counter = 1

    while old not in check:
        # print(old,counter)
        check.add(old)
        check_dic[old] = counter

        counter += 1
        old = fn(old)

    # print("!!!!!!!!!!!")
    print(counter)


if __name__ == "__main__":
    main()
Buggy code:
s=int(input())
a=[]
na=[]
a.append(s)
for i in range(1,10**6):
    if a[i-1]%2==0:
        a.append(a[i-1]/2)
    else:
        a.append(a[i-1]*3+1)
    na=set(a)
    if len(na)!=i+1:
        print(a[i])
        exit()

Fixed code:
s=int(input())
a=[]
na=[]
a.append(s)
for i in range(1,10**6):
    if a[i-1]%2==0:
        a.append(a[i-1]/2)
    else:
        a.append(a[i-1]*3+1)
    na=set(a)
    if len(na)!=i+1:
        print(i+1)
        exit()
Buggy code:
from collections import defaultdict

s = int(input())

A = defaultdict(int)

n = 1
while True:
  if A[s]:
    print(A[s])
    exit()
  A[s] = n
  if s % 2:
    s = 3 * s + 1
  else:
    s //= 2
  n += 1
  

Fixed code:
from collections import defaultdict

s = int(input())

A = defaultdict(int)

n = 1
while True:
  if A[s]:
    print(n)
    exit()
  A[s] = n
  if s % 2:
    s = 3 * s + 1
  else:
    s //= 2
  n += 1
Buggy code:
a=int(input())
s=set(a)
i=1
while True:
  if a % 2==1:
    a = a * 3 + 1
  else:
    a = a//2
    
  if a in s:
    break
  s|={a}
  i+=1
print(i)

Fixed code:
a=int(input())
s={a}
i=1
while True:
  i+=1
  if a % 2==1:
    a = a * 3 + 1
  else:
    a = a//2
    
  if a in s:
    break
  s|={a}
print(i)
Buggy code:
s = int(input)

A = []

A.append(s)
a = s
for i in range(10000):
    if a % 2 == 0:
        a = int(a/2)
        A.append(a)
    else:
        a = 3*a+1
        A.append(a)
    if A.count(a) == 2:
        print(a)
        break


Fixed code:
s = int(input())
A = []

A.append(s)
a = s
for i in range(10000):
    if a % 2 == 0:
        a = int(a/2)
        A.append(a)
    else:
        a = 3*a+1
        A.append(a)
    if A.count(a) == 2:
        print(len(A))
        break
Buggy code:
s=int(input())

def collatz(n):
    if n%2==0:
        n=n/2
    else: 
        n=3*n+1
    return int(n)

l=[s]
while s!=1:
    s=collatz(s)
    l.append(s)

if s==1:
    print(4)
elif s==2:
    print(4)
else:
    print(len(l)+1)

Fixed code:
s=int(input())

def collatz(n):
    if n%2==0:
        n=n/2
    else: 
        n=3*n+1
    return int(n)

l=[s]
while s!=1:
    s=collatz(s)
    l.append(s)

if l[0]==1:
    print(4)
elif l[0]==2:
    print(4)
else:
    print(len(l)+1)
Buggy code:
n = int(input())
cnt = 1
if n>=3:
    cnt = cnt + 1
elif n=2:
    cnt = cnt + 2
else:
    cnt = cnt + 3
while n != 1:
    if n % 2 == 0:
        n /= 2
    else:
        n = 3*n+1
    cnt += 1
print(cnt)

Fixed code:
n = int(input())
cnt = 1
if n>=3:
    cnt = cnt + 1
elif n==2:
    cnt = cnt + 2
else:
    cnt = cnt + 3
while n != 1:
    if n % 2 == 0:
        n /= 2
    else:
        n = 3*n+1
    cnt += 1
print(cnt)
Buggy code:
s = int(input())

def calc_next(x):
  if x % 2 == 0:
    return x // 2
  else:
    return 3 * x + 1

a = [s]
n = 1

while True:
  a.append(calc_next(a[n-1]))
  for i in range(n):
    if a[k] == a[n]:
      print(n+1)
      exit(0)
  n += 1

Fixed code:
s = int(input())

def calc_next(x):
  if x % 2 == 0:
    return x // 2
  else:
    return 3 * x + 1

a = [s]
n = 1

while True:
  a.append(calc_next(a[n-1]))
  for i in range(n):
    if a[i] == a[n]:
      print(n+1)
      exit(0)
  n += 1
Buggy code:
s = int(input())

t = set([])
for i in range(1,10**6+1):
  if s%2==0:
    s//=2
  else:
    s=s*3+1
  if s in t:
    print(i)
    break
  else:
    t.add(s)

Fixed code:
s = int(input())

t = set([s])
for i in range(1,10**6+1):
  if s%2==0:
    s//=2
  else:
    s=s*3+1
  if s in t:
    print(i+1)
    break
  else:
    t.add(s)
Buggy code:
def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3*n + 1
s = int(input())
a = [0]
a.append(s)
for i in range(1,10**8):
    x = a[-1]
    y = f(x)
    if y in a:
        print(i)
        break
    a.append(y)

Fixed code:
def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3*n + 1
s = int(input())
a = [0]
a.append(s)
for i in range(2,10**7+1):
    x = a[-1]
    y = f(x)
    if y in a:
        print(i)
        break
    a.append(y)
Buggy code:

s = int(input())

val = s
mp = {}
i= 0
while True:
  i+=1
  if val%2==0:
    val = val//2
  else:
    val = 2*val+1
  
  if val in mp:
    print(i)
    break
  else:
    mp[val] = 1

Fixed code:

s = int(input())

val = s
mp = {s:1}
i= 1
while True:
  i+=1
  if val%2==0:
    val = val//2
  else:
    val = 3*val+1
  
  if val in mp:
    print(i)
    break
  else:
    mp[val] = 1
Buggy code:
a=[int(input())]
for i in range(1000000):
    n=a[i]
    if n%2==0:
        a.append(n/2)
    else:
        a.append(3*n+1)
    if a[i+1]==4:
        print(i+5)
        break
print(a)

Fixed code:
a=[int(input())]
for i in range(1000000):
    n=a[i]
    if n%2==0:
        a.append(int(n/2))
    else:
        a.append(3*n+1)

for i in range(1000000):
    if a[i-3]==a[i]:
        print(i+1)
        break
Buggy code:
#116 B
s =int(input())
lists=[]
lists.append(s)
for i in range(2,100):
    if lists[-1]%2==0:
        tmp=int(lists[-1]/2)
        lists.append(tmp)
        if lists.count(tmp)==2:
            print(i)
            exit()
    else:
        tmp=(3*lists[-1])+1
        lists.append(tmp)
        if lists.count(tmp)==2:
            print(i)
            exit()

Fixed code:
#116 B
s =int(input())
lists=[]
lists.append(s)
for i in range(2,1000001):
    if lists[-1]%2==0:
        tmp=int(lists[-1]/2)
        lists.append(tmp)
        if lists.count(tmp)==2:
            print(i)
            exit()
    else:
        tmp=(3*lists[-1])+1
        lists.append(tmp)
        if lists.count(tmp)==2:
            print(i)
            exit()
Buggy code:

s = int(input())
temp = []
temp.append(s)
former = s
idx = 1

while True:
    idx += 1
    if former % 2 == 0:
        later = former / 2
    else:
        later = former * 3 + 1

    if later in temp:
        print(idx)
        break


Fixed code:

s = int(input())
temp = []
temp.append(s)
former = s
idx = 1

while True:
    idx += 1
    later = former / 2 if former % 2 == 0 else former * 3 + 1

    if later in temp:
        print(idx)
        break
    temp.append(later)
    former = later
Buggy code:
s = int(input())
alist = [s]
aset=set()
for i in range(1000000):
  n = alist[-1]
  if n in aset:
    print(len(alist))
    break
  aset.add(n)
  if n%2 ==0:
    x = n//2
  else:
    x = 3*n+1
  alist.append(x)
print(alist)

Fixed code:
s = int(input())
alist = [s]
aset=set()
for i in range(1000000):
  n = alist[-1]
  if n in aset:
    print(len(alist))
    break
  aset.add(n)
  if n%2 ==0:
    x = n//2
  else:
    x = 3*n+1
  alist.append(x)
Buggy code:
s = int(input())


def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return n * 3 + 1


def insert(sslist, x):
    if not sslist:
        sslist.append(x)
        return False

    start = 0
    end = len(sslist)

    while start < end - 1:
        y = sslist[(start + end) // 2]
        if x == y:
            return True
        if x < y:
            end = (start + end) // 2
        if x > y:
            start = (start + end) // 2

    if sslist[start] == x:
        return True
    if sslist[start] < x:
        sslist.insert(start + 1, x)
        return False
    if sslist[start] > x:
        sslist.insert(start, x)
        return False


slist = []
ss = s
for i in range(2, 2**32):
    ret = insert(slist, ss)
    print(slist)
    ss = f(ss)
    if ret:
        print(i)
        break


Fixed code:
s = int(input())


def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return n * 3 + 1


def insert(sslist, x):
    if not sslist:
        sslist.append(x)
        return False

    start = 0
    end = len(sslist)

    while start < end - 1:
        y = sslist[(start + end) // 2]
        if x == y:
            return True
        if x < y:
            end = (start + end) // 2
        if x > y:
            start = (start + end) // 2

    if sslist[start] == x:
        return True
    if sslist[start] < x:
        sslist.insert(start + 1, x)
        return False
    if sslist[start] > x:
        sslist.insert(start, x)
        return False


slist = []
ss = s
for i in range(1, 2**32):
    ret = insert(slist, ss)
    ss = f(ss)
    if ret:
        print(i)
        break
Buggy code:
s = int(input())
array = [s]

m = 1
while m < 100000:
  if (s % 2 == 0):
    s = s / 2
  else:
    s = 3 * s + 1
  
  if s in array:
    print(m)
    break
  else:
    array.append(m)
    m += 1

Fixed code:
s = int(input())
array = [s]
 
m = 2
while m < 100000:
  if (s % 2 == 0):
    s = s / 2
  else:
    s = 3 * s + 1
  
  if s in array:
    print(m)
    break
  else:
    array.append(s)
    m += 1
Buggy code:
N = int(input())
Flag = 0
nList = []
nList.append(N)
i = 2
while Flag==0:
  Tmp = N % 2
  if Tmp == 0:
    TmpN /= 2
  else:
    TmpN = 3 * N + 1
  
  if TmpN in nList:
    Flag = 1
    break
  else:
    nList.append(TmpN)
    N = TmpN
    i += 1

print(i)





Fixed code:
N = int(input())
Flag = 0
nList = []
nList.append(N)
i = 2
while Flag==0:
  Tmp = N % 2
  TmpN = N
  if Tmp == 0:
    TmpN /= 2
  else:
    TmpN = 3 * N + 1
  
  if TmpN in nList:
    Flag = 1
    break
  else:
    nList.append(TmpN)
    N = TmpN
    i += 1

print(i)
Buggy code:
def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3 * n + 1

s = int(input())

c = 1

l = []

while f(s) not in l:
    l.append(f(s))
    c += 1

print(c+1)

Fixed code:
def f(n):
    if n % 2 == 0:
        return n // 2
    else:
        return 3 * n + 1

s = int(input())

l = []
l.append(s)

c = 1

while f(s) not in l:
    s = f(s)
    l.append(s)
    c+=1

print(c+1)
Buggy code:
def func(x):
  if(x % 2 == 0):
    return x / 2
  else:
    return 3 * x + 1

s = int(input())
if(s == 1 || s == 2):
  print(4)
  exit()
  
cnt = 1
while(s != 1):
  s = func(s)
  cnt += 1
print(cnt + 1)


Fixed code:
def func(x):
  if(x % 2 == 0):
    return x / 2
  else:
    return 3 * x + 1

s = int(input())
if((s == 1) or (s == 2)):
  print(4)
  exit()
  
cnt = 1
while(s != 1):
  s = func(s)
  cnt += 1
print(cnt + 1)
Buggy code:
a=[]
cp_a=[]
an = input()
a.append(int(an))
i=0
cp_a.append(a[0])
t_or_f = 0
m = 0
n = 0

for k in range(1000000):
    if int(a[i])%2==0:
        cal = int(a[i])* (1/2)
        next_i = i+1
        a.append(int(cal))
        cp_a.append(a[next_i])
        i = i+1
    elif int(a[i])%2!=0:
        next_i = i+1
        cal  = 3*int(a[i]) + 1
        a.append(int(cal))
        cp_a.append(a[next_i])
        i = i+1


for s in range(i):
    for t in range(s+1,i):
        if a[s]==cp_a[t]:
            n = s
            m = t
            print(m+1)
            t_or_f = 1
            break
    if t_or_f:
        break

# print(a)
# print(cp_a)





Fixed code:
a=[]
cp_a=[]
an = input()
a.append(int(an))
i=0
cp_a.append(a[0])
t_or_f = 0
m = 0
n = 0

for k in range(1000000):
    if int(a[i])%2==0:
        cal = int(a[i])* (1/2)
        next_i = i+1
        a.append(int(cal))
        cp_a.append(a[next_i])
        i = i+1
    elif int(a[i])%2!=0:
        next_i = i+1
        cal  = 3*int(a[i]) + 1
        a.append(int(cal))
        cp_a.append(a[next_i])
        i = i+1


    for s in range(i):
        for t in range(s+1,i):
            if a[s]==cp_a[t]:
                n = s
                m = t
                print(m+1)
                t_or_f = 1
                break
        if t_or_f:
            break
    if t_or_f:
        break

# print(a)
# print(cp_a)
Buggy code:
s=int(input())
a=[s]
def f(s):
    if s%2==0:
        return s//2
    else:
        return 3*s+1
for i in range(1000001):
    if f(a[i]) in a:
        print(i+2)
        break
    else:
        a.append(f(a[i]))
print(a)

Fixed code:
s=int(input())
a=[s]
def f(s):
    if s%2==0:
        return s//2
    else:
        return 3*s+1
for i in range(1000001):
    if f(a[i]) in a:
        print(i+2)
        break
    else:
        a.append(f(a[i]))
Buggy code:
s = int(input())
a = [s]
z = set(s)
idx = 1
for i in range(10**8):
    idx += 1
    if a[i] % 2 == 0:
        ai = a[i] // 2
    else:
        ai = 3 * a[i] + 1
    if ai in z:
        print(idx)
        exit()
    a.append(ai)
    z.add(ai)


Fixed code:
s = int(input())
a = [s]
z = set([s])
idx = 1
for i in range(10**8):
    idx += 1
    if a[i] % 2 == 0:
        ai = a[i] // 2
    else:
        ai = 3 * a[i] + 1
    if ai in z:
        print(idx)
        exit()
    a.append(ai)
    z.add(ai)
Buggy code:
s=int(input())
nums=[]
nums.append(s)
i=2
while(1):
  if i%2==0:
    new=int(i/2)
    if new in nums:
      print(i)
      break
    nums.append(new)
  else:
    new=3*i+1
    if new in nums:
      print(i)
      break
    nums.append(new)
  i+=1
  

Fixed code:
s=int(input())
nums=[]
nums.append(s)
i=2
while(1):
  if nums[i-2]%2==0:
    new=int(nums[i-2]/2)
    if new in nums:
      print(i)
      break
    nums.append(new)
  else:
    new=3*nums[i-2]+1
    if new in nums:
      print(i)
      break
    nums.append(new)
  i+=1
Buggy code:
s = int(input())

a_list = []
a_list.append(s)
while True:
    if s%2 ==0:
        if s/2 in a_list:
            print(len(a_list)+1)
            break
        else: 
            a_list.append(s/2)
            s = s/2
    elif s%2 !=0:
        if (3*s)+1 in a_list:
            print(len(a_list)+1)
            break
        else:
            a_list.append((3*s)+1)
            n = (3*s)+1

Fixed code:
s = int(input())

a_list = []
a_list.append(s)
while True:
    if s%2 ==0:
        if s/2 in a_list:
            print(len(a_list)+1)
            break
        else: 
            a_list.append(s/2)
            s = s/2
    elif s%2 !=0:
        if (3*s)+1 in a_list:
            print(len(a_list)+1)
            break
        else:
            a_list.append((3*s)+1)
            s = (3*s)+1
Buggy code:
s = int(input())

a = []
a.append(s)
count = 1
while True:
  count+=1
  if s %2 == 0:
    s=s//2
  else:
    s= 3*s+1
  if s in a:
    print(count)
    break
  a.append(s)
print(a)




Fixed code:
s = int(input())

a = []
a.append(s)
count = 1
while True:
  count+=1
  if s %2 == 0:
    s=s//2
  else:
    s= 3*s+1
  if s in a:
    print(count)
    break
  a.append(s)
Buggy code:
s = int(input())
a = [s]
ans = -1
for i in range(1000000):
    if ans != -1:
        if a[-1] % 2 == 0:
            a.append(a[-1]/2)
        else:
            a.append(3*a[-1]+1)    

        for j in range(len(a)-1):
            if a[-1] == a[j]:
                ans = len(a)
                break
    else:
        print(ans)
        break

Fixed code:
s = int(input())
a = [s]
ans = -1
for i in range(1000000):
    if ans == -1:
        if a[-1] % 2 == 0:
            a.append(a[-1]/2)
        else:
            a.append(3*a[-1]+1)    

        for j in range(len(a)-1):
            if a[-1] == a[j]:
                ans = len(a)
                break
    else:
        print(ans)
        break
Buggy code:
s = int(input())
vals = []
vals += [s]
n=1
while True:
    if vals[n-1]%2==0:
        val = vals[n-1]/2
    else:
        val = vals[n-1]*3+1
        
    if val in vals:
        print(val)
        break
    else:
        vals += [val]
        n += 1

Fixed code:
s = int(input())
vals = []
vals += [s]
n=1
while True:
    if vals[n-1]%2==0:
        val = vals[n-1]/2
    else:
        val = vals[n-1]*3+1
        
    if val in vals:
        print(len(vals)+1)
        break
    else:
        vals += [val]
        n += 1
Buggy code:
import sys
s = int(input())
flg=0
A = []
A.append(s)

index = 0
if s==4 or s==2 or s==1:
    print(index+4)
    sys.exit()
while flg!=1:
    if A[index]%2==0:
        f = (A[index]//2)
    else:
        f = 3*A[index]+1
    print(index)
    A.append(f)
    index = index + 1

    if f==4 or f==2 or f==1:
        flg=1
        break

#1,4,2,1,4

print(index+4)

Fixed code:
import sys
s = int(input())
flg=0
A = []
A.append(s)

index = 0
if s==4 or s==2 or s==1:
    print(index+4)
    sys.exit()
while flg!=1:
    if A[index]%2==0:
        f = (A[index]//2)
    else:
        f = 3*A[index]+1

    A.append(f)
    index = index + 1

    if f==4 or f==2 or f==1:
        flg=1
        break

#1,4,2,1,4

print(index+4)
Buggy code:
def f(n):
    if n%2==0:
        n//2
    else:
        3*n+1
s=int(input())
a=list()
i=1
while 1:
    if f(s) in a:
        break
    a.append(f(s))
    s=f(s)
    i+=1
print(i)

Fixed code:
def f(n):
    if n%2==0:
        return n//2
    else:
        return 3*n+1
s=int(input())
a=list()
i=1
while 1:
    if s in a:
        break
    a.append(s)
    s=f(s)
    i+=1
print(i)
Buggy code:
S = int(input())
l = []
while (S not in l):
  l.append(S)
  if S%2 == 0:
    S //= 2
  else:
    S = 3*S+1
print(len(S)+1)

Fixed code:
S = int(input())
l = []
while (S not in l):
  l.append(S)
  if S%2 == 0:
    S //= 2
  else:
    S = 3*S+1
print(len(l)+1)
Buggy code:
s=int(input())
a=[]
while True:
  if s not in a:
    a.append(s)
  else:
    break
  if s%2==0:
    s/=2
  else:
    s=3*s+1
print(len(a))

Fixed code:
s=int(input())
a=[]
while True:
  if s not in a:
    a.append(s)
  else:
    break
  if s%2==0:
    s/=2
  else:
    s=3*s+1
print(len(a)+1)
Buggy code:
from collections import defaultdict
d = defaultdict(int)
import sys
sys.setrecursionlimit(10**8)
def f(n,i):
  if n%2==0:
    x=n//2
  else:
    x=3*n+1
  d[x]+=1
  if d[x]==2:
    return i+1
  f(x,i+1)
print(f(int(input()),0))

Fixed code:
from collections import defaultdict
d = defaultdict(int)
import sys
sys.setrecursionlimit(10**8)
def f(n,i):
  d[n]+=1
  if d[n]==2:
    return i
  if n%2==0:
    x=n//2
  else:
    x=3*n+1
  return f(x,i+1)
print(f(int(input()),1))
Buggy code:
an = int(input())

numbers = []
while True:
	if an%2 == 1:
		an = 3*an+1
	else:
		an = an//2
	if an in numbers:
		print(len(numbers)+1)
        break
    else:
		numbers.append(an)

Fixed code:
an = int(input())

numbers = [an]
while True:
  if an%2 == 1:
    an = 3*an+1
  else:
    an = an//2
  if an in numbers:
    print(len(numbers)+1)
    break
  else:
    numbers.append(an)
Buggy code:
s=int(input())
l=[]
l.append(s)
ans=[]
c=1
for i in range(10000000000):
    if l[c-1]%2==0:
        l.append(int(l[c-1]/2))
    else:
        l.append(int(l[c-1]*3+1))
    for v in range(len(l)):
        ans.append(l.count(l[v]))
    if 2 in ans:
        break
    c+=1
print(c)

Fixed code:
s=int(input())
l=[]
l.append(s)
ans=[]
c=1
for i in range(10000000000):
    if l[c-1]%2==0:
        l.append(int(l[c-1]/2))
    else:
        l.append(int(l[c-1]*3+1))
    for v in range(len(l)):
        ans.append(l.count(l[v]))
    if 2 in ans:
        break
    c+=1
print(c+1)
Buggy code:
a = int(input())
b = [a]
c = 0
while True:
  c += 1
  if a % 2 == 0:
    a /= 2
    if a in b:
      print(c)
      exit()
    else:
      b.append(a)
  else:
    a = a * 3 + 1
    if a in b:
      print(c)
      exit()
    else:
      b.append(a)


Fixed code:
a = int(input())
b = [a]
c = 1
while True:
  c += 1
  if a % 2 == 0:
    a /= 2
    if a in b:
      print(c)
      exit()
    else:
      b.append(a)
  else:
    a = a * 3 + 1
    if a in b:
      print(c)
      exit()
    else:
      b.append(a)
Buggy code:
from collections import defaultdict
a = int(input())
idxs = defaultdict(int)
idxs[a] = 1
i = 1
ans = None
while True:
  i += 1
  if a % 2 == 0:
    a //= 2
  else:
    a = 3 * a + 1
    
  if not idxs[a]:
    idxs[a] = i
  else:
    ans = i

print(ans)
    
    



Fixed code:
from collections import defaultdict
a = int(input())
idxs = defaultdict(int)
idxs[a] = 1
i = 1
ans = None
while True:
  i += 1
  if a % 2 == 0:
    a //= 2
  else:
    a = 3 * a + 1
    
  if not idxs[a]:
    idxs[a] = i
  else:
    ans = i
    break

print(ans)
Buggy code:
s = int(input())
lis = [s]

while len(lis) == len(set(lis)):
  if s % 2 == 0:
    lis.append(s / 2)
  else:
    lis.append(3 * s + 1)
    
print(len(lis))

Fixed code:
s = int(input())
lis = [s]
 
while len(lis) == len(set(lis)):
  if lis[-1] % 2 == 0:
    lis.append(lis[-1] / 2)
  else:
    lis.append(3 * lis[-1] + 1)
    
print(len(lis))
Buggy code:
s = input()
a = [s]
def f(n):
    if n % 2 == 0:
        return(n//2)
    else:
        return(3*n+1)
i = 0
while True:
    if f(a[i]) in a:
        print(i+1)
        break
    a.append(f(a[i])
    i += 1


Fixed code:
def f(n):
    if n % 2 == 0:
        return n / 2
    else:
        return 3 * n + 1


s = int(input())

a = []
a.append(s)

i = 1
while True:
    a.append(f(a[i-1]))
    if a[i] in a[:-2]:
        break
    i += 1

print(i + 1)
Buggy code:
s = int(input())
a = set(s)
p = s
n = 0
cnt = 0
while True:
  if n in a:
    print(cnt)
    exit()
  if p&1:
    n = 3*p +1
  else:
    n = p//2
  cnt += 1
  set.add(n)
  p = n


Fixed code:
s = int(input())
a = set([s])
p = s
n = 0
cnt = 1
while True:
  if n in a:
    print(cnt)
    exit()
  a.add(n)
  if p&1:
    n = 3*p +1
  else:
    n = p//2
  cnt += 1
  p = n
Buggy code:
s = int(input())

a = [s]
def f(n):
    if n % 2 == 0:
        return(n//2)
    else:
        return(3*n+1)

for i in range(1000001):
    if f(a[i]) in a:
        print(i+1)
        break
    a.append(f(a[i])
    


Fixed code:
s = int(input())

a = [s]
def f(n):
    if n % 2 == 0:
        return(n//2)
    else:
        return(3*n+1)

for i in range(1000001):
    if f(a[i]) in a:
        print(i+2)
        break
    a.append(f(a[i]))
Buggy code:
a = int(input())
M = 1000000
m = 1

while m <= M:
    if a in (1, 2, 41):
        m += 3
        break
    if a % 2 == 0:
        a //= 2
    else:
        a = 3 * a + 1
    m += 1

print(m)


Fixed code:
a = int(input())
M = 1000000
m = 1

while m <= M:
    if a in (1, 2, 4):
        m += 3
        break
    if a % 2 == 0:
        a //= 2
    else:
        a = 3 * a + 1
    m += 1

print(m)
Buggy code:
s=int(input())
l=[s]
a=s
for i in range(1000000):
      if a%2==0:
            a=int(a/2)
            l.append(a)
      else:
            a=3*a+1
            l.append(a)
            
      print(l)
      print(l.count(a))
      if l.count(a)==2:
            print(len(l))
            break


Fixed code:
s=int(input())
l=[s]
a=s
for i in range(1000000):
      if a%2==0:
            a=int(a/2)
            l.append(a)
      else:
            a=3*a+1
            l.append(a)
      if l.count(a)==2:
            print(len(l))
            break
Buggy code:
a=[int(input())]
i=0
while True:
  i+=1
  if a[-1]%2==1:
    if a[-1]*3+1 in a:
      break
    a.append(a[-1]*3+1)
  else:
    if a[-1]/2 in a:
      break
    a.append(a[-1]/2)
print(i)

Fixed code:
a=[int(input())]
i=1
while True:
  i+=1
  if a[-1]%2==1:
    if a[-1]*3+1 in a:
      break
    a.append(a[-1]*3+1)
  else:
    if a[-1]/2 in a:
      break
    a.append(a[-1]/2)
print(i)