qyliang/CodeNanoFix huggingface dataset:
Buggy code:
N=int(input())
S="a"
bottom=""
alpha="abcdefghijklmnopqrstuvwxyz"

for i in range(N):
    if i>25:
        bottom=bottom+"z"
    else:
        bottom=bottom+alpha[i]
    S=S+"a"
print(bottom)

C=0
S=""
def F(S,loop,N,C):
    for i in range(0,loop):
        if N==C+1:
            print(S+bottom[i])
        else:
            F(S+bottom[i],i+2,L,C+1)
    return None
            
F(S,1,L,C)

Fixed code:
N=int(input())
S="a"
bottom=""
alpha="abcdefghijklmnopqrstuvwxyz"

for i in range(N):
    if i>25:
        bottom=bottom+"z"
    else:
        bottom=bottom+alpha[i]
    S=S+"a"

C=0
S=""
def F(S,loop,N,C):
    for i in range(0,loop):
        if N==C+1:
            print(S+bottom[i])
        else:
            if loop==i+1:
                loop+=1
            F(S+bottom[i],loop,N,C+1)
    return None
            
F(S,1,N,C)
Buggy code:
#!/usr/bin/env python
# coding: utf-8

def ri():
    return int(input())

def rl():
    return list(input().split())

def rli():
    return list(map(int, input().split()))

words = set()
alp = list("abcdefghij")
def dfs(n, s):
    if len(s) == n:
        return
    for i in range(0, len(s)):
        for c in alp:
            if ord(c)>ord(s[i])+1:
                break
            ns = s[:i+1]+c+s[i+1:]
            if ns in words:
                continue
            words.add(ns)
            dfs(n, ns)

def main():
    n = ri()
    dfs(n, 'a')
    for w in sorted(words):
        if len(w) == n:
            print(w)



if __name__ == '__main__':
    main()


Fixed code:
#!/usr/bin/env python
# coding: utf-8

def ri():
    return int(input())

def rl():
    return list(input().split())

def rli():
    return list(map(int, input().split()))

words = set()
alp = list("abcdefghij")
def dfs(n, s):
    if len(s) == n:
        return
    for i in range(0, len(s)):
        for c in alp:
            if ord(c)>ord(s[i])+1:
                break
            ns = s[:i+1]+c+s[i+1:]
            if ns in words:
                continue
            words.add(ns)
            dfs(n, ns)

def main():
    n = ri()
    if n == 1:
        print("a")
        return
    dfs(n, 'a')
    for w in sorted(words):
        if len(w) == n:
            print(w)



if __name__ == '__main__':
    main()
Buggy code:
import sys
sys.setrecursionlimit(10**9)
l = []
def calc3(s, N):
    if len(s) == N:
        l.append(s)
        return
    if len(s) > 0:
        c = s[-1]
        s2 = s[:]
        z = ord(c) - ord('a') + 2
        for i in range(z):
            st = s[:]
            st += chr(ord('a')+i)
            calc3(st[:], N)
    else:
        c = 'a'
        s += chr(ord(c))
        calc3(s[:], N)
def main():
    N = int(input())
    s = ''
    calc3(s[:], N)
    l = sorted(set(l))
    for i in l:
        print(i)
main()



Fixed code:
import sys
sys.setrecursionlimit(10**9)
def main():
    N = int(input())
    s = ''
    l = []
    def calc3(s, N, i):
        if len(s) == N:
            l.append(s)
            return
        if len(s) > 0:
            s2 = s[:]
            z = i + 2
            for j in range(z):
                st = s[:]
                st += chr(ord('a')+j)
                if j == i + 1:
                    calc3(st[:], N, i+1)
                else:
                    calc3(st[:], N, i)
        else:
            s += 'a'
            calc3(s[:], N, i)
    calc3(s[:], N, 0)
    l = sorted(set(l))
    for i in l:
        print(i)
main()
Buggy code:
import sys
sys.setrecursionlimit(10**7)

readline = sys.stdin.buffer.readline
def readstr():return readline().rstrip().decode()
def readstrs():return list(readline().decode().split())
def readint():return int(readline())
def readints():return list(map(int,readline().split()))
def printrows(x):print('\n'.join(map(str,x)))
def printline(x):print(' '.join(map(str,x)))

n = readint()

ans = [[[0],[0]]]

i = 0
while len(ans[i][0])<n:
    print(ans)
    a = ans[i]
    for x in a[1]:
        ans.append([a[0]+[x],a[1]])
    x = a[1][-1]+1
    ans.append([a[0]+[x],a[1] + [x]])
    i+=1

a_ = ord('a')

for i in range(len(ans)):
    a = ans[i][0]
    if len(a)<n:
        continue
    for x in a[:-1]:
        print(chr(x+a_),end='')
    print(chr(a[-1]+a_))
    


Fixed code:
import sys
sys.setrecursionlimit(10**7)

readline = sys.stdin.buffer.readline
def readstr():return readline().rstrip().decode()
def readstrs():return list(readline().decode().split())
def readint():return int(readline())
def readints():return list(map(int,readline().split()))
def printrows(x):print('\n'.join(map(str,x)))
def printline(x):print(' '.join(map(str,x)))

n = readint()

ans = [[[0],[0]]]

i = 0
while len(ans[i][0])<n:
    a = ans[i]
    for x in a[1]:
        ans.append([a[0]+[x],a[1]])
    x = a[1][-1]+1
    ans.append([a[0]+[x],a[1] + [x]])
    i+=1

a_ = ord('a')

for i in range(len(ans)):
    a = ans[i][0]
    if len(a)<n:
        continue
    for x in a[:-1]:
        print(chr(x+a_),end='')
    print(chr(a[-1]+a_))
Buggy code:
N = int(input())
ans = ['a']
moji = ['a','b','c','d','e','f','g','h','i','j']
count = 1
while count < N:
    tmp = []
    for i in ans:
        for k in range(len(set(list(i)))+1):
            tmp.append(i+moji[k])
    count += 1
    ans = tmp
print(sorted(ans))

Fixed code:
N = int(input())
ans = ['a']
moji = ['a','b','c','d','e','f','g','h','i','j']
count = 1
while count < N:
    tmp = []
    for i in ans:
        for k in range(len(set(list(i)))+1):
            tmp.append(i+moji[k])
    count += 1
    ans = tmp
ans.sort()
for i in ans:
    print(i)
Buggy code:
n=int(input())
def d(s):
    if len(s)==n:print(s)
    else:for i in range(97,ord(max(s))+2):d(s+chr(i))
d("a")

Fixed code:
n=int(input())
def d(s):
    if len(s)==n:
        print(s)
    else:
        for i in range(97,ord(max(s))+2):
            d(s+chr(i))
d("a")
Buggy code:
start="a"
n=int(input())
ans=[]

def dfs(string,n):
    if len(string)==n:
        print(string)
    else:
        s=string
        for i in range(97,max([ord(j)for j in string])+2):
            dfs(string+chr(i),n)
        

dfs(start,n)
print(len(ans))
for i in ans:
    print(i)

Fixed code:


def dfs(string,n):
    if len(string)==n:
        print(string)
    else:
        s=string
        for i in range(97,max([ord(j)for j in string])+2):
            dfs(string+chr(i),n)
        

dfs("a",int(input()))
Buggy code:
from copy import copy
n = int(input())
data = ["a"] * n
ans = []

def print_str(ans, data, i):
    if i == n:
        return 
    ans.append("".join(data))
    mx = max(data[i] for i in range(n))
    while ord(data[i]) + 1 <= ord(mx) + 1:
        data[i] = chr(ord(data[i]) + 1)
        s = copy(data)
        ans.append("".join(data))
        print_str(ans, s, i + 1)
    data = ["a"] * n
    print_str(ans, data, i + 1)

print_str(ans, data, 1)
ans = sorted(set(ans))
for i in range(len(ans)):
    print(ans[i])

Fixed code:
from copy import copy
n = int(input())
data = ["a"] * n
ans = ["".join(data)]

def print_str(ans, data, i):
    if i == n:
        return 
    ans.append("".join(data))
    mx = max(data[i] for i in range(n))
    while ord(data[i]) + 1 <= ord(mx) + 2:
        s = copy(data)
        ans.append("".join(data))
        print_str(ans, s, i + 1)
        data[i] = chr(ord(data[i]) + 1)
    data = ["a"] * n
    print_str(ans, data, i + 1)

print_str(ans, data, 1)
ans = sorted(set(ans))
for i in range(len(ans)):
    print(ans[i])
Buggy code:
from collections import deque
import sys
n = int(input())
if n == 1:
    print('a')
    sys.exit()

q = deque([])
q.append((1, 'a', 1))
cur = 1
while cur != n:
    num = len(q)
    j = 0
    while j < num:
        a, b, c = q.popleft()
        for i in range(1, c+2):
            q.append((i, b + chr(96+i), max(map(int, list(b + chr(96+i)))))
        j += 1
    cur += 1

for i in range(len(q)):
    a, b, c = q.popleft()
    print(b)



Fixed code:
from collections import deque
import sys
n = int(input())
if n == 1:
    print('a')
    sys.exit()

q = deque([])
q.append((1, 'a', '1'))
cur = 1
while cur != n:
    num = len(q)
    j = 0
    while j < num:
        a, b, c = q.popleft()
        for i in range(1, max(map(int, list(c)))+2):
            q.append((i, b + chr(96+i), c + str(i)))
        j += 1
    cur += 1

for i in range(len(q)):
    a, b, c = q.popleft()
    print(b)
Buggy code:
N = int(input())
int2char = {i: chr(i + 96) for i in range(1, 11)}
ans = ['a']
for n in range(2, N+1):
    new_list = []
    for string in ans:
        str_set = set(string)
        for i in range(1, n+1):
            if len(str_set) + 1< i:
                continue 
            new_str = string + int2char[i]
            new_list.append(new_str)
    ans = new_list

print(sorted(ans))

Fixed code:
N = int(input())
int2char = {i: chr(i + 96) for i in range(1, 11)}
ans = ['a']
for n in range(2, N+1):
    new_list = []
    for string in ans:
        str_set = set(string)
        for i in range(1, n+1):
            if len(str_set) + 1< i:
                continue 
            new_str = string + int2char[i]
            new_list.append(new_str)
    ans = new_list
ans = sorted(ans)
for a in ans:
    print(a)
Buggy code:
N = int(input())

# mx = count up flag
def dfs(s, mx):
    print('dfs(', s, ', ', str(mx), ')')
    if len(s) == N:
        print(s)
    else:
        for c in range(ord('a'), mx+1):
            dfs(s+chr(c), mx + 1 if c == mx else mx)

dfs("", ord('a'))


Fixed code:
N = int(input())

# mx = count up flag
def dfs(s, mx):
    if len(s) == N:
        print(s)
    else:
        for c in range(ord('a'), mx+1):
            dfs(s+chr(c), mx + 1 if c == mx else mx)

dfs("", ord('a'))
Buggy code:
# ret = []
N = int(input())
L = [[0]]
# ret.append(L.copy())

for _ in range(N - 1):
    newL = []
    for s in L:
        for i in range(max(s) + 2):
            newL.append(s.copy() + [i])
#     ret.append(newL.copy())
    L = newL.copy()
    
di = {i: chr(ord('a') + i) for i in range(10)}
print('\n'.join([''.join(list(map(lambda x: di[x], newL[i]))) for i in range(len(newL))]))

Fixed code:
# ret = []
N = int(input())
newL = [[0]]
# ret.append(L.copy())

for _ in range(N - 1):
    L = newL.copy()
    newL = []
    for s in L:
        for i in range(max(s) + 2):
            newL.append(s.copy() + [i])
#     ret.append(newL.copy())
    
di = {i: chr(ord('a') + i) for i in range(10)}
print('\n'.join([''.join(list(map(lambda x: di[x], newL[i]))) for i in range(len(newL))]))
Buggy code:
str = 'abcdefghijklmnop'
def bt(n,m,s):
  if n == 0:
    print(s)
    return
  for c in range(m):
    bt(n-1,m,s+str[c])
  #introduce another character
  bt(n-1,m+1,s+str[m])
n = int(input())

Fixed code:
str = 'abcdefghijklmnop'
def bt(n,m,s):
  if n == 0:
    print(s)
    return
  for c in range(m):
    bt(n-1,m,s+str[c])
  #introduce another character
  bt(n-1,m+1,s+str[m])
n = int(input())
bt(n,0,'')
Buggy code:
k = "a",
for _ in range(int(input()) - 1):
  k = {a + b for a in r for b in a + chr(ord(max(a)) + 1)}
print(*sorted(k), sep='\n')

Fixed code:
k = "a",
for _ in range(int(input()) - 1):
  k = {a + b for a in k for b in a + chr(ord(max(a)) + 1)}
print(*sorted(k), sep='\n')
Buggy code:
N = int(input())
def to_str(n):
    s = [chr(i + 97) for i in reversed(n)]
    s = "".join(s)
    return s
n = [0] * N
n_max = list(reversed(list(range(N))))

while True:
    for j in range(N-1):
        if n[j] < n[j+1]+1:
            n[j] += 1
            for k in range(j):
                n[k] = 0
            s = to_str(n)
            print(s)
            break
    if n == n_max:
        break

Fixed code:
N = int(input())
#N = 4
def to_str(n):
    s = [chr(i + 97) for i in reversed(n)]
    s = "".join(s)
    return s
n = [0] * N
n_max = list(reversed(list(range(N))))

s = to_str(n)
print(s)
while True:
    for j in range(N-1):
        #if n[j] < n[j+1]+1:
        if n[j] < max(n[j+1:]) + 1:
            n[j] += 1
            for k in range(j):
                n[k] = 0
            s = to_str(n)
            print(s)
            break
    if n == n_max:
        break
Buggy code:
l = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n"]
n = int(input())
ans = [[] for i in range(n)]
ans[0].append("a")

for i in range(1,n):
    print(ans)
    for j in ans[i-1]:
        a = 0
        for k in j:
            a = max(a,ord(k)-ord("a"))
        for k in range(a+2):
            an = j + l[k]
            ans[i].append(an)
count = ans[-1]
count.sort()
for i in count:
    print(i)


Fixed code:
l = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n"]
n = int(input())
ans = [[] for i in range(n)]
ans[0].append("a")

for i in range(1,n):
    
    for j in ans[i-1]:
        a = 0
        for k in j:
            a = max(a,ord(k)-ord("a"))
        for k in range(a+2):
            an = j + l[k]
            ans[i].append(an)
count = ans[-1]
count.sort()
for i in count:
    print(i)
Buggy code:
from collections import deque

n=int(input())
a_num = ord("a")
deque = deque()
deque.append(("a", a_num))
ans = []

while len(deque) > 0:
    s, s_num = deque.popleft()
    for i in range(a_num, s_num + 2):
        s_nxt = s + chr(i)
        s_num = max(s_num, i)
        if len(s_nxt) == n:
            ans.append(s_nxt)
        else:
            deque.appendleft((s_nxt, s_num))

ans.sort()
for a in ans:
    print(a)

Fixed code:
from collections import deque

n=int(input())
a_num = ord("a")
deque = deque()
deque.append(("a", a_num))
ans = []

if n > 1:
    while len(deque) > 0:
        s, s_num = deque.popleft()
        for i in range(a_num, s_num + 2):
            s_nxt = s + chr(i)
            s_num = max(s_num, i)
            if len(s_nxt) == n:
                print(s_nxt)
            else:
                deque.append((s_nxt, s_num))
else:
    print("a")
Buggy code:
N=int(input())

S = 'abcdefghij'

def num(x):
    ans = 0
    for i in range(len(S)):
        count = 0
        for j in range(0,len(x)):
            if x[j] == S[i]:
                count = count +1
        if count != 0:
            ans = ans + 1
        else:
            ans = ans
    return ans

def base(x):
    List=[]
    for j in range(len(x)):
        for i in range(num(x[j])+1):
            List.append(x[j]+S[i])
    return List

K = 'a'

cou = 1
while cou < N:
    K = base(K)
    cou = cou+1

print(K)

Fixed code:
N=int(input())

S = 'abcdefghij'

def num(x):
    ans = 0
    for i in range(len(S)):
        count = 0
        for j in range(0,len(x)):
            if x[j] == S[i]:
                count = count +1
        if count != 0:
            ans = ans + 1
        else:
            ans = ans
    return ans

def base(x):
    List=[]
    for j in range(len(x)):
        for i in range(num(x[j])+1):
            List.append(x[j]+S[i])
    return List

K = 'a'

cou = 1
while cou < N:
    K = base(K)
    cou = cou+1

for i in range(len(K)):
    print(K[i])
Buggy code:
import sys
readline = sys.stdin.readline

res = []
def fill(K, f):
    if K.count(-1) == 0:
        res.append(K)
        return 
    else:
        idx = []
        for i in range(N):
            if K[i] == -1:
                idx.append(i)
        kc = len(idx)
        for S in range(1, 1<<kc):
            if not S & 1:
                continue
            K2 = K[:]
            for j in range(kc):
                if S & (1<<j):
                    K2[idx[j]] = f
            fill(K2, f+1)
            
            
N = int(readline())
fill([-1]*N, 0)
res = [''.join(map(lambda x: chr(x+97), r)) for r in res]
print('\n'.join(res))


Fixed code:
import sys
readline = sys.stdin.readline

res = []
def fill(K, f):
    if K.count(-1) == 0:
        res.append(K)
        return 
    else:
        idx = []
        for i in range(N):
            if K[i] == -1:
                idx.append(i)
        kc = len(idx)
        for S in range(1, 1<<kc):
            if not S & 1:
                continue
            K2 = K[:]
            for j in range(kc):
                if S & (1<<j):
                    K2[idx[j]] = f
            fill(K2, f+1)
            
            
N = int(readline())
fill([-1]*N, 0)
res.sort()
res = [''.join(map(lambda x: chr(x+97), r)) for r in res]
print('\n'.join(res))
Buggy code:
from collections import deque
 
n = int(input())
 
def dfs(n):
  stack = deque()
  stack.append("a")
  while stack:
    q = stack.popleft()
    if len(q) == n:
      ans.append(q) 
    if len(q) < n:
      for i in range(ord("a"), ord(max(q)) + 2):
        stack.append(q + chr(i))
    print(stack)
    
ans = []
dfs(n)
 
print("\n".join(ans))

Fixed code:
from collections import deque
 
n = int(input())
 
def dfs(n):
  stack = deque()
  stack.append("a")
  while stack:
    q = stack.popleft()
    if len(q) == n:
      ans.append(q) 
    if len(q) < n:
      for i in range(ord("a"), ord(max(q)) + 2):
        stack.append(q + chr(i))
    #print(stack)
    
ans = []
dfs(n)
 
print("\n".join(ans))
Buggy code:
# -*- coding: utf-8 -*-

min_char = "abcdefghij"

def dtype_tree(tree, start, num):
    for i in range(start+1):
        if num > 0:
            tgt_tree = [i]
            new_tree = dtype_tree([], i+1, num-1)
            tgt_tree.append(new_tree)
            if tree == None:
                tree = tgt_tree
            else:
                tree.append(tgt_tree)
        else:
            tree.append([i])
    return tree

def print_tree(tree, prefix):
    new_prefix = prefix
    if len(tree) == 1:
        print(prefix + min_char[tree[0]])
    else:
        for elem in tree:
            if type(elem) != list:
                new_prefix += min_char[elem]
#                print(new_prefix)
            else:
                print_tree(elem, new_prefix)

    return


def abc_XXX(num):
    tree = dtype_tree(None, 0, num-1)
#    print(tree)
    print_tree(tree, "")
    return

###
# main
if(__name__ == '__main__'):
    # input
    n = int(input())
    
    abc_XXX(n)
    
    # output

# else:
    # do nothing


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

min_char = "abcdefghij"

def dtype_tree(tree, max, num):
    for i in range(max+1):
        tgt_tree = [i]
        if num > 0:
            new_max = max
            if new_max < i+1:
                new_max = i+1
            new_tree = dtype_tree([], new_max, num-1)
            tgt_tree.append(new_tree)

        if tree == None:
            tree = tgt_tree
        else:
            tree.append(tgt_tree)
    return tree

def print_tree(tree, prefix):
    new_prefix = prefix
    if len(tree) == 1:
        print(prefix + min_char[tree[0]])
    else:
        for elem in tree:
            if type(elem) != list:
                new_prefix += min_char[elem]
#                print(new_prefix)
            else:
                print_tree(elem, new_prefix)

    return


def abc_XXX(num):
    tree = dtype_tree(None, 0, num-1)
#    print(tree)
    print_tree(tree, "")
    return

###
# main
if(__name__ == '__main__'):
    # input
    n = int(input())
    
    abc_XXX(n)
    
    # output

# else:
    # do nothing
Buggy code:
import sys
sys.setrecursionlimit(10 ** 6)


N = int(input())
ans = []
a = ord('a')


def f(c, A):
    global N, a
    if 0 not in A:
        ans.append(''.join(A))
        return
    B = list(A)
    for i in range(2 ** (B.count(0)) - 1, 2 ** (B.count(0) - 1) - 1, -1):
        k = i
        C = B[:]
        idx = C.index(0)
        while k > 0:
            if k & 1 == 1:
                C[idx] = c
            if 0 in C[idx + 1:]:
                idx = C.index(0, idx + 1)
            k >>= 1
        f(chr(ord(c) + 1), tuple(C))



A = [0] * N
f('a', tuple(A))
ans = list(ans)
ans.sort()
print(*ans, sep='\n')


Fixed code:
import sys
sys.setrecursionlimit(10 ** 6)


N = int(input())
ans = []
a = ord('a')


def f(c, A):
    global N, a
    if 0 not in A:
        ans.append(''.join(A))
        return
    B = list(A)
    idx = B.index(0)
    B[idx] = c
    if 0 not in B:
        ans.append(''.join(B))
        return

    for i in range(2 ** (B.count(0)) - 1, -1, -1):
        k = i
        C = B[:]
        idx = C.index(0)
        while k > 0:
            if k & 1 == 1:
                C[idx] = c
            if 0 in C[idx + 1:]:
                idx = C.index(0, idx + 1)
            k >>= 1
        f(chr(ord(c) + 1), tuple(C))



A = [0] * N
f('a', tuple(A))
ans = list(ans)
ans.sort()
print(*ans, sep='\n')
Buggy code:
N = int(input())

alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

def norm(n, prev_list):
	out_list = []
	for line in prev_list:
		for i in range(len(set(line))+1):
			new_line = line + alphabet[i]
			out_list.append(new_line)
	return out_list

init_line = ['a']

for _ in range(N-1):
	init_line = norm(1, init_line)

print(init_line)


Fixed code:
N = int(input())

alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

def norm(n, prev_list):
	out_list = []
	for line in prev_list:
		for i in range(len(set(line))+1):
			new_line = line + alphabet[i]
			out_list.append(new_line)
	return out_list

init_line = ['a']

for _ in range(N-1):
	init_line = norm(1, init_line)
for line in init_line:
	print(line)
Buggy code:
from collections import deque
N = int(input())
alpha = ['a','b','c','d','e','f','g','h','i','j']
ans = []

stack = deque(['a'])

while stack:
    print(stack)
    if len(stack[-1]) == N:
        break
    s = stack.pop()
    s_list = list(s)
    index = alpha.index(s_list[-1])
    print(index)
    for i in range(index+2):
        stack.appendleft(s+alpha[i])
    

stack.reverse()
for j in range(len(stack)):
    print(stack[j])



Fixed code:
from collections import deque
N = int(input())
alpha = ['a','b','c','d','e','f','g','h','i','j']
ans = []

stack = deque(['a'])

while stack:
    if len(stack[-1]) == N:
        break
    s = stack.pop()
    s_list = sorted(list(s))
    index = alpha.index(s_list[-1])
    for i in range(index+2):
        stack.appendleft(s+alpha[i])
    

stack.reverse()
for j in range(len(stack)):
    print(stack[j])
Buggy code:
s = input()
s.replace('hi', '')
if s:
  print('No')
else:
  print('Yes')

Fixed code:
s = input()
s = s.replace('hi', '')
if s:
  print('No')
else:
  print('Yes')
Buggy code:
S = str(input())

S.replace("hi", "")
if S = "":
  print("Yes")
else:
  print("No")

Fixed code:
S = str(input())
 
S1 = S.replace("hi", "")
if S1 == "":
  print("Yes")
else:
  print("No")
Buggy code:
s = input()
if s == 'hi' or 'hihi' or 'hihihi' or 'hihihihi' or 'hihihihihi':
    print('Yes')
else: print('No')

Fixed code:
s = input()
if s == 'hi' or s == 'hihi' or s == 'hihihi' or s == 'hihihihi' or s =='hihihihihi':
    print('Yes')
else: print('No')
Buggy code:
S = input()
if S == "hi" or "hihi" or "hihihi" or "hihihihi" or "hihihihihi":
    print("Yes")
else:
    print("No")


Fixed code:
S = input()
if S == "hi" or S =="hihi" or S =="hihihi" or S =="hihihihi" or S =="hihihihihi":
    print("Yes")
else:
    print("No")
Buggy code:
s=input()
flag=True
for i in range(0,len(s),2):
  if "hi"=ar[i:i+2]:
    continue
  else:
    flag=False
    break
if flag==True:
  print("Yes")
else:
  print("No")

Fixed code:
s=input()
flag=True
for i in range(0,len(s),2):
  if "hi"==s[i:i+2]:
    continue
  else:
    flag=False
    break
if flag==True:
  print("Yes")
else:
  print("No")
Buggy code:
s = input().split("hi")


if len(set(s)) == 1:
  print("Yes")
else:
  print("No")

Fixed code:
s = input().split("hi")

if len(s)==1:
  print("No")
elif len(set(s)) == 1:
  print("Yes")
else:
  print("No")
Buggy code:
S = input()

if len(S) < 2:
    print('No')
    return

s = S.replace('hi', '')

# print(S)
print('Yes' if len(s) < 1 else 'No')

Fixed code:
S = input()

if len(S) < 2:
    print('No')
    exit()

s = S.replace('hi', '')

# print(S)
print('Yes' if len(s) < 1 else 'No')
Buggy code:
s = input()
if len(s)%2 == 0:
  for i in len(s)//2:
    if s[2*i] != "h" and s[2*i+1] != "i":
      print("No")
      exit()
  print("Yes")
else:
  print("No")

Fixed code:
s = input()
if len(s)%2 == 0:
  for i in range(len(s)//2):
    if s[2*i] != "h" or s[2*i+1] != "i":
      print("No")
      exit()
  print("Yes")
else:
  print("No")