qyliang/CodeNanoFix huggingface dataset:
Buggy code:
import sys
input = sys.stdin.readline

def main():
    N,M,P = map(int,input().split())
    edges = []


    for _ in range(M):
        A,B,C = map(int,input().split())
        edges.append([A-1,B-1,P-C])

    reachable_from = [False for _ in range(N)]
    reachable_from[0] = True
    reachable_to = [False for _ in range(N)]
    reachable_to[N-1] = True

    for i in range(N-1):
        for edge in edges:
            if reachable_from[edge[0]]:
                reachable_from[edge[1]] = True
            if reachable_to[edge[1]]:
                reachable_to[edge[0]] = True

    edges2 = []
    for edge in edges:
        if reachable_from[edge[0]] and reachable_to[edge[0]]:
            edges2.append(edge)

    inf = 10000*(10**5)
    dist = [inf for _ in range(N)]
    dist[0] = 0

    for i in range(N):
        for edge in edges2:
            if dist[edge[1]] > dist[edge[0]] + edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
                if i==N-1:
                    print(-1)
        else:
            continue
        break
    else:
        print(max(0,-1*dist[N-1]))

if __name__ == "__main__":
    main()


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

def main():
    N,M,P = map(int,input().split())
    edges = []


    for _ in range(M):
        A,B,C = map(int,input().split())
        edges.append([A-1,B-1,P-C])

    reachable_from = [False for _ in range(N)]
    reachable_from[0] = True
    reachable_to = [False for _ in range(N)]
    reachable_to[N-1] = True

    for i in range(N-1):
        for edge in edges:
            if reachable_from[edge[0]]:
                reachable_from[edge[1]] = True
            if reachable_to[edge[1]]:
                reachable_to[edge[0]] = True

    edges2 = []
    for edge in edges:
        if reachable_from[edge[0]] and reachable_to[edge[0]]:
            edges2.append(edge)

    inf = 10000*(10**5)
    dist = [inf for _ in range(N)]
    dist[0] = 0

    for i in range(N):
        for edge in edges2:
            if dist[edge[1]] > dist[edge[0]] + edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
                if i==N-1:
                    print(-1)
                    break
        else:
            continue
        break
    else:
        print(max(0,-1*dist[N-1]))

if __name__ == "__main__":
    main()
Buggy code:
import sys
input = sys.stdin.readline

def main():
    N,M,P = map(int,input().split())
    edges = []


    for _ in range(M):
        A,B,C = map(int,input().split())
        edges.append([A-1,B-1,P-C])

    inf = 10000*(10**5)
    dist = [inf for _ in range(N)]
    dist[0] = 0

    for i in range(N-1):
        for edge in edges:
            if dist[edge[1]] > dist[edge[0]] + edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
    ans = -1*dist[N-1]
    
    for i in range(N-1):
        for edge in edges:
            if dist[edge[1]] > dist[edge[0]]+edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
    ans2 = -1*dist[N-1]

    if ans2<=ans: 
        print(ans)                
    else:
        print(-1)

if __name__ == "__main__":
    main()


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

def main():
    N,M,P = map(int,input().split())
    edges = []


    for _ in range(M):
        A,B,C = map(int,input().split())
        edges.append([A-1,B-1,P-C])

    inf = 10000*(10**5)
    dist = [inf for _ in range(N)]
    dist[0] = 0

    for i in range(N-1):
        for edge in edges:
            if dist[edge[1]] > dist[edge[0]] + edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
    ans = -1*dist[N-1]
    
    for i in range(N-1):
        for edge in edges:
            if dist[edge[1]] > dist[edge[0]]+edge[2]:
                dist[edge[1]] = dist[edge[0]]+edge[2]
    ans2 = -1*dist[N-1]

    if ans2<=ans: 
        print(max(0,ans))         
    else:
        print(-1)

if __name__ == "__main__":
    main()
Buggy code:
N, M, P = map(int, input().split())
edge = []

for i in range(M):
    A, B, C = map(int, input().split())
    edge.append((A, B, P-C))

inf = float('inf')
cost = [inf] * (N+1)
cost[1] = 0
for i in range(N-1):
    for e in edge:
        a, b, c = e
        if cost[a] + c < cost[b]:
            cost[b] = cost[a] + c

for e in edge:
    a, b, c = e
    if cost[a] + c < cost[b]:
      if b == N:
      	print(-1)
        exit()
      cost[b] = cost[a] + c
        
print(max(-cost[N], 0))





Fixed code:
N, M, P = map(int, input().split())
edge = []

for i in range(M):
    A, B, C = map(int, input().split())
    edge.append((A, B, P-C))

inf = float('inf')
cost = [inf] * (N+1)
cost[1] = 0
for i in range(N-1):
    for e in edge:
        a, b, c = e
        if cost[a] + c < cost[b]:
            cost[b] = cost[a] + c

for i in range(N):
    for e in edge:
        a, b, c = e
        if cost[a] + c < cost[b]:
            if b == N:
                print(-1)
                exit()
            else:
                cost[b] = cost[a] + c
        
print(max(-cost[N], 0))
Buggy code:
import sys
input=sys.stdin.readline

def BellmanFord(Edges,num_v,source):
    inf=float('inf')
    dist=[inf for _ in range(num_v)]
    dist[source]=0
    for i in range(num_v):
        for edge in Edges:
            if edge[0]!=inf and dist[edge[1]]>dist[edge[0]]+edge[2]:
                dist[edge[1]]=dist[edge[0]]+edge[2]
                if i==num_v-1:
                    before_dist=dist[num_v-1]
                    for i in range(num_v):
                        for edge in edges:
                            if edge[0]!=inf and dist[edge[1]] > dist[edge[0]]+edge[2]:
                                dist[edge[1]]=dist[edge[0]]+edge[2]
                    if before_dist!=dist[num_v-1]:
                        return -1
    return dist

n,m,p=map(int,input().split())
Edges=[]
for _ in range(m):
    a,b,c=map(int,input().split())
    a-=1; b-=1
    Edges.append((a,b,-(c-p)))
d=BellmanFord(Edges,n,0)
print(-1 if d==-1 else max(0,-d[-1]))

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

def BellmanFord(Edges,num_v,source):
    inf=float('inf')
    dist=[inf for _ in range(num_v)]
    dist[source]=0
    for i in range(num_v):
        for edge in Edges:
            if edge[0]!=inf and dist[edge[1]]>dist[edge[0]]+edge[2]:
                dist[edge[1]]=dist[edge[0]]+edge[2]
                if i==num_v-1:
                    before_dist=dist[num_v-1]
                    for i in range(num_v):
                        for edge in Edges:
                            if edge[0]!=inf and dist[edge[1]] > dist[edge[0]]+edge[2]:
                                dist[edge[1]]=dist[edge[0]]+edge[2]
                    if before_dist!=dist[num_v-1]:
                        return -1
    return dist

n,m,p=map(int,input().split())
Edges=[]
for _ in range(m):
    a,b,c=map(int,input().split())
    a-=1; b-=1
    Edges.append((a,b,-(c-p)))
d=BellmanFord(Edges,n,0)
print(-1 if d==-1 else max(0,-d[-1]))
Buggy code:
INF = 10**10
n, m, p = [int(item) for item in input().split()]
edge = [[] for _ in range(n)]
for i in range(m):
    a, b, c = [int(item) for item in input().split()]
    a -= 1; b -= 1; c -= p
    c *= -1
    edge[a].append((b, c))
print(edge)

dist = [INF] * n
dist[0] = 0
update = 1
terminal_update = 0
for _ in range(n):
    update = 0
    for v, e in enumerate(edge):
        for t, cost in e:
            if dist[v] != INF and dist[v] + cost < dist[t]:
                dist[t] = dist[v] + cost
                update = 1
                if t == n-1:
                    terminal_update += 1
    if not update:
        print(max(0, -dist[n-1]))
        break
else:
    if terminal_update > 1:
        print(-1)
    else:
        print(max(0, -dist[n-1]))

Fixed code:
INF = 10**18
n, m, p = [int(item) for item in input().split()]
edge = [[] for _ in range(n)]
for i in range(m):
    a, b, c = [int(item) for item in input().split()]
    a -= 1; b -= 1; c -= p
    c *= -1
    edge[a].append((b, c))
 
dist = [INF] * n
dist[0] = 0
update = 1
terminal_update = 0
for _ in range(n * 2):
    update = 0
    for v, e in enumerate(edge):
        for t, cost in e:
            if dist[v] != INF and dist[v] + cost < dist[t]:
                dist[t] = dist[v] + cost
                update = 1
                if t == n-1:
                    terminal_update += 1
    if not update:
        print(max(0, -dist[n-1]))
        exit()
else:
    if terminal_update > 1:
        print(-1)
    else:
        print(max(0, -dist[n-1]))
Buggy code:
n, m, p = map(int,input().split())
A = [list(map(int,input().split())) for i in range(m)]

for i in range(m):
    A[i][2] = - (A[i][2]-p)

#import numpy as np
# A = np.full(np.inf, (n+1, n+1))

# scipy.sparse.csgraph.bellman_ford


S = [10**13 for i in range(n+1)]

S[1]=0
for i in range(m):
    if A[i][0] == 1:
        S[A[i][1]]=A[i][2]

for j in range(n-1):
    for i in range(m):
        S[A[i][1]] = min(S[A[i][1]], S[A[i][0]]+A[i][2])

S0 = S[:]

for j in range(1):
    for i in range(m):
        S[A[i][1]] = min(S[A[i][1]], S[A[i][0]]+A[i][2])

S1 = S[:]

if S0 != S1:
    print(-1)
else:
    print(max(0, -S0[n]))

Fixed code:
n, m, p = map(int,input().split())
A = [list(map(int,input().split())) for i in range(m)]

for i in range(m):
    A[i][2] = - (A[i][2]-p)

#import numpy as np
# A = np.full(np.inf, (n+1, n+1))

# scipy.sparse.csgraph.bellman_ford


S = [10**13 for i in range(n+1)]

S[1]=0
for i in range(m):
    if A[i][0] == 1:
        S[A[i][1]]=A[i][2]

for j in range(n-1):
    for i in range(m):
        S[A[i][1]] = min(S[A[i][1]], S[A[i][0]]+A[i][2])

#print(S)
ans1 = -S[n]

for j in range(n):
    for i in range(m):
        S[A[i][1]] = min(S[A[i][1]], S[A[i][0]]+A[i][2])
#print(S)
ans2 = -S[n]

if ans1 != ans2:
    print(-1)
else:
    print(max(0, ans1))
Buggy code:
inf = float('inf')
V,E,P = map(int,input().split())
edge = []
for i in range(E):
    A,B,C = map(int,input().split())
    c = P-C
    if A == B:
        c *= inf
    edge.append([A-1,B-1,c])

d = [inf]*V
d[0] = 0
for i in range(V):
    update = False
    for j in range(E):
        From,To,cost = edge[j]
        if d[From] != inf and d[To]>d[From]+cost:
            d[To]=d[From]+cost
            update = True
    if not update:
        break

ans = d[V-1]

for i in range(V):
    update = False
    for j in range(E):
        From,To,cost = edge[j]
        if d[From] != inf and d[To]>d[From]+cost:
            d[To]=d[From]+cost
            update = True
    if not update:
        break
loop = ans != d[V-1]

if loop or ans==inf:
    print(-1)

else:
    ans = -d[-1]
    print(max(0,ans))

Fixed code:
inf = float('inf')
V,E,P = map(int,input().split())
edge = []
for i in range(E):
    A,B,C = map(int,input().split())
    edge.append([A-1,B-1,P-C])

d = [inf]*V
d[0] = 0
for i in range(V):
    update = False
    for j in range(E):
        From,To,cost = edge[j]
        if d[From] != inf and d[To]>d[From]+cost:
            d[To]=d[From]+cost
            update = True
    if not update:
        break

ans = d[V-1]

for i in range(V):
    update = False
    for j in range(E):
        From,To,cost = edge[j]
        if d[From] != inf and d[To]>d[From]+cost:
            d[To]=d[From]+cost
            update = True
    if not update:
        break
loop = ans != d[V-1]

if loop:
    print(-1)

else:
    ans = -d[-1]
    print(max(0,ans))
Buggy code:
N, M, P = map(int, input().split())
E = [list(map(int, input().split())) for _ in range(M)]
A = [-float("inf")] * (N+1)
A[1] = 0
for v in range(N):
    for a, b, c in E:
        t = A[a] + c - P
        if t > A[b]:
            A[b] = t
A_copy = A[:]
for v in range(N):
    for a, b, c in E:
        t = A[a] + c - P
        if t > A[b]:
            A[b] = t
if A_copy!=A:
    print(-1)
else:
    print(max(0, A[-1]))


Fixed code:
N, M, P = map(int, input().split())
E = [list(map(int, input().split())) for _ in range(M)]
A = [-float("inf")] * (N+1)
A[1] = 0
for v in range(N):
    for a, b, c in E:
        t = A[a] + c - P
        if t > A[b]:
            A[b] = t
ans = A[N]
for v in range(N):
    for a, b, c in E:
        t = A[a] + c - P
        if t > A[b]:
            A[b] = t
if ans!=A[N]:
    print(-1)
else:
    print(max(0, ans))
Buggy code:
def f(N):
    x=0
    for i in range(N):
        t=str(i)
        if len(t)%2==1:
            x+=1
    return x
N=int(input())
print(f(N))
            
       

Fixed code:
def f(N):
    x=0
    for i in range(N+1):
        t=str(i)
        if len(t)%2==1:
            x+=1
    return x-1
N=int(input())
print(f(N))
Buggy code:
x=str(input())
ans=0
for i in range(0,int(x)):
    if len(str(i))%2!=0:
        ans+=1
print(ans)

Fixed code:
x=int(input())
ans=0
for i in range(1,x+1):
    if len(str(i))%2==1:
        ans+=1
print(ans)
Buggy code:
n = int(input())
def numOfDigits(num):
    return len(str(num))
ans += 1
while n > 0:
    if numOfDigits(n)%2 == 1:
        ans += 1
print(ans)


Fixed code:
n = int(input())
def numOfDigits(num):
    return len(str(num))
ans = 0
while n > 0:
    if numOfDigits(n)%2 == 1:
        ans += 1
    n -= 1
print(ans)
Buggy code:
N=input()
Num = len(N)
if Num == 5:
		Ans = (int(N)-9999) + 900 + 9
elif Num == 4:
		Ans = 900 + 9
elif Num == 3:
		Ans = (int(N)-99) + 9
elif Num == 2:
		Ans = 9
elif Num == 1:
		Ans = N
print(Ans)

Fixed code:
N=input()
Num = len(N)
if Num == 5:
		Ans = (int(N)-9999) + 900 + 9
elif Num == 4:
		Ans = 900 + 9
elif Num == 3:
		Ans = (int(N)-99) + 9
elif Num == 2:
		Ans = 9
elif Num == 1:
		Ans = N
elif Num == 6:
  Ans = 90000 + 900 + 9
print(Ans)
Buggy code:
def int_multiple():
    return  [int(c) for c in input().split()]

def int_single():
    return int(input())

def str_multiple():
    return [c for c in input().split()]

def str_single():
    return input()

# start

n = int_single()

r = 0
for i in range(1, n):
    if (len(str(i)) % 2 == 1):
        res += 1

print(res)


Fixed code:
def int_multiple():
    return  [int(c) for c in input().split()]

def int_single():
    return int(input())

def str_multiple():
    return [c for c in input().split()]

def str_single():
    return input()

# start

n = int_single()

r = 0
for i in range(1, n+1):
    if (len(str(i)) % 2 == 1):
        r += 1

print(r)
Buggy code:
def main():
    N = int(input())
    i = 0
    while N >0:
        if len(N) % 2 != 0:
            i+=1
        N -= 1
    print(i)
main()

Fixed code:
def main():
    N = input()
    i = 0
    while int(N) >0:
        if len(N) % 2 != 0:
            i+=1
        N = int(N) -1
        N = str(N)
    print(i)
main()
Buggy code:
N = str(input())
m = len(N)
ans = int(N) 
if m == 2:
    ans = 9
elif m == 3:
    ans -= 90
elif m == 4:
    ans = 909
elif m == 5:
    ans -= 10000
    ans += 1
    ans += 909
elif N == 6:
    ans = 90909
print(ans)

Fixed code:
N = str(input())
m = len(N)
ans = int(N) 
if m == 2:
    ans = 9
elif m == 3:
    ans -= 90
elif m == 4:
    ans = 909
elif m == 5:
    ans -= 10000
    ans += 1
    ans += 909
elif m == 6:
    ans = 90909
print(ans)
Buggy code:
num=input("N:")
count=0


for i in range(1,int(num)+1,1):
    if len(str(i))%2==1:
        count+=1
        
print(count)


Fixed code:
num=input("")
count=0


for i in range(1,int(num)+1,1):
    if len(str(i))%2==1:
        count+=1
        
print(count)
Buggy code:
n=int(input())
c=1
while n>=10:
    n=n//10
    c=c+1
ans=0
for i in range(1,c+1):
    if i%2==1:
        ans+=10**(i)-10**(i-1)
if c%2==1:
    ans=ans+n+1-10**(c-1)
print(ans)

Fixed code:
n=int(input())
t=n
c=1
while t>=10:
    t=t//10
    c=c+1
ans=0
for i in range(1,c):
    if i%2==1:
        ans+=10**(i)-10**(i-1)
if c%2==1:
    ans=ans+n+1-10**(c-1)
print(ans)
Buggy code:
n = int(input())

count = 0
for i in range(n):
  i = str(i)
  if len(i) % 2 == 1:
    count += 1
print(count)

Fixed code:
n = int(input())

count = 0
for i in range(1,n+1):
    if len(str(i))%2 == 1:
        count += 1

print(count)
Buggy code:
import math
import collections
import itertools

def resolve():

    N=int(input())

    ans=0
    for i in range(1,N):
        if(10<=i<99 or 1000<=i<9999 or 100000<=i<999999):
            continue
        ans+=1
    print(ans)
resolve()


Fixed code:
import math
import collections
import itertools

def resolve():

    N=int(input())

    ans=0
    for i in range(1,N+1):
        if(10<=i<=99 or 1000<=i<=9999 or 100000<=i<=999999):
            continue
        ans+=1
    print(ans)
resolve()
Buggy code:
N = input()

odd_list = [i for i in range(len(N)) if i % 2 == 1]
count = 0
for i in range(len(odd_list)):
    count += 10**int(odd_list[i])-10**(len(N)-2)
if len(N) % 2 == 1:
    count += int(N)+1-10**(len(N)-1)

print(count)

Fixed code:
N = input()

odd_list = [i for i in range(len(N)) if i % 2 == 1]
count = 0
for i in range(len(odd_list)):
    count += 10**int(odd_list[i])-10**int(odd_list[i]-1)
if len(N) % 2 == 1:
    count += int(N)+1-10**(len(N)-1)

print(int(count))
Buggy code:
N= int(input())

if N <10:
	print(N)
elif N<100:
	print(9)
elif N <1000:
	print(N-90)
elif N <10000:
	print(909)
else:
	print(N-9000-90)


Fixed code:
N= int(input())

if N <10:
	print(N)
elif N<100:
	print(9)
elif N <1000:
	print(N-90)
elif N <10000:
	print(909)
elif N <100000:
	print(N-9000-90)
else: 
	print(90909)
Buggy code:
N = int(input().strip())

keta = len(str(N))

count = 0
  
for i in range(1, keta, 2):
  count += (10 ** i)
  
if (keta  % 2) != 0:
  count += (N - 10 ** (keta - 1) + 1)
  
if N >= 10:
  count -= 1
  
print(count)

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

keta = len(str(N))

count = 0

if N >= 10:
  
  count += 9
  
  for i in range(3, keta, 2):
    count += (10 ** (i) - 10 ** (i - 1))

  if (keta  % 2) != 0:
    count += (N - 10 ** (keta - 1) + 1)
  
else:
  count = N
  
print(count)
Buggy code:
N = int(input())
kekka = 0
for i in range(1:N+1):
    if len(str(i)) % 2 == 1:
        kekka += 1


Fixed code:
N = int(input())
kekka = 0
for i in range(1,N+1):
    if len(str(i)) % 2 == 1:
        kekka += 1

print(kekka)
Buggy code:
#<B>
N = input()
ans = 0
for i in range(1, int(N)):
    if len(str(i)) % 2 != 0:
        ans += 1

print(ans)

Fixed code:
#<B>
N = int(input())
ans = 0
for i in range(1, N + 1):
    if len(str(i)) % 2 == 1:
        ans += 1

print(ans)
Buggy code:
s = int(input())
ans = 0

for i in range(1, s):
    if len(str(i))%2 == 1:
        ans += 1

print(ans)

Fixed code:
N = int(input())

ans = 0
for i in range(1,N+1):
	s = str(i)
	if (len(s) % 2) == 1:
		ans += 1

print(ans)
Buggy code:
n = int(input())
i = 1
cnt = 0
while i < n:
    if len(str(i)) % 2 >= 1:
        cnt += 1
    i += 1
print(cnt)

Fixed code:
n = int(input())
i = 1
cnt = 0
while i <= n:
    if len(str(i)) % 2 >= 1:
        cnt += 1
    i += 1
print(cnt)
Buggy code:
#! /usr/bin/env python3
# -*- coding:utf-8 -*-

n = int(input())
d = len(str(n))
count = 0
ans = n

for i in range(d):
    if i%2 == 1: continue
    count += min(ans, 9*(10**i))
    ans -= 9*(10**i)

print(count)

Fixed code:
#! /usr/bin/env python3
# -*- coding:utf-8 -*-

n = int(input())
d = len(str(n))
count = 0
ans = n

for i in range(d):
    if i%2 == 0: count += min(ans, 9*(10**i))
    ans -= 9*(10**i)

print(count)
Buggy code:
N = int(input())

ans = 0
for i in range(N):
    if len(str(i)) % 2 == 1:
        ans += 1
print(ans)

Fixed code:
N = int(input())

ans = 0
for i in range(1, N+1):
    if len(str(i)) % 2 == 1:
        ans += 1
print(ans)
Buggy code:
n = int(input())
count = 0
for i in range(1, 6):
    # 10,1000,100000
    if i % 2 == 1:
        if n < 10 ** i:
            count += n - 10 ** (i-1) + 1
            print(count)
            exit()
        else:
            count += 10 ** i - (10**(i-1))
            #print('b', i, count)
    else:
        if n < 10 ** i:
            print(count)
            exit()


Fixed code:
n = int(input())
count = 0
for i in range(1, 6):
    # 10,1000,100000
    if i % 2 == 1:
        if n < 10 ** i:
            count += n - 10 ** (i-1) + 1
            print(count)
            exit()
        else:
            count += 10 ** i - (10**(i-1))

    else:
        if n < 10 ** i:
            print(count)
            exit()

print(count)
Buggy code:
N = int(input())
 ans = 0
for i in range(1, N + 1):
	if len(str(i)) % 2 == 1:
	ans += 1
print(ans)


Fixed code:
n = int(input())
ans = 0

for i in range(1, n + 1):
    if len(str(i)) % 2 == 1:
        ans += 1
print(ans)
Buggy code:
N = int(input())
count = 0
for i in range(1,N):
  if len(str(i)) % 2 == 0:
    continue
  else:
    count += 1
print(count)

Fixed code:
N = int(input())
count = 0

for i in range(1, N + 1):
  if len(str(i)) % 2 == 1:
    count += 1

print(count)
Buggy code:
n=int(input())
ans=0
for(i)in range(1,n+1):
  if len(str(n))%2==1:ans+=1
print(ans)

Fixed code:
n=int(input())
ans = 0
for i in range(1, n+1):
    tmp = str(i)
    if len(tmp) % 2 == 1:
        ans += 1
print(ans)
Buggy code:
N=int(input())
if N<10:
  A=N
elif N<100:
  A=9
elif N<1000:
  A=9+N-99
elif N<10000:
  A=9+900
elif N<100000:
  A=9+900+N-9999
else:
  A=9+900+N-9999+1  
print(A)
  

Fixed code:
N=int(input())
if N<10:
  A=N
elif N<100:
  A=9
elif N<1000:
  A=9+N-99
elif N<10000:
  A=9+900
elif N<100000:
  A=9+900+N-9999
else:
  A=9+900+90000  
print(A)
Buggy code:
import collections

n = int(input())
print(collections.Counter([len(str(i))%2 for i in range(1,n)])[1])

Fixed code:
import collections

n = int(input())
print(collections.Counter([len(str(i))%2 for i in range(1,n+1)])[1])
Buggy code:
import math
N = int(input())
ans=0
for i in range(N):
    if i>0 and math.ceil(math.log10(i))%2==1 :
        ans += 1
print(ans)


Fixed code:
import math
N = int(input())
ans=0
for i in range(N +1):
    if i>0 and math.ceil(math.log10(i+1))%2==1 :
        ans += 1
print(ans)
Buggy code:
n=int(input())

if n<100:
  print(min(n,9))
elif n<10000:
  print(min(n-90),909)
else:
  print(min(n-9090),90909)

Fixed code:
n=int(input())

if n<100:
  print(min(n,9))
elif n<10000:
  print(min(n-90,909))
else:
  print(min(n-9090,90909))
Buggy code:
n=int(input())

if n<10:
  print(n)
elif n<100:
  print(9)
elif n<1000:
  print(n-90)
elif n<10000:
  print(909)
else n<100000:
  print(n-9090)
else:
  print(90909)

Fixed code:
n=int(input())

if n<10:
  print(n)
elif n<100:
  print(9)
elif n<1000:
  print(n-90)
elif n<10000:
  print(909)
elif n<100000:
  print(n-9090)
else:
  print(90909)
Buggy code:
# -*- coding: utf-8 -*-

# input
N = int(input())

# solve
ans = 0
for i in range(1, N):
    if len(str(i)) % 2 != 0:
        ans += 1

# output
print(ans)


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

# input
N = int(input())

# solve
ans = 0
for i in range(1, N + 1):
    if len(str(i)) % 2 != 0:
        ans += 1

# output
print(ans)
Buggy code:
n = int(input())
ans = 0
for i in range(1,n+1):
  if i % 2 == 1:
    ans += 1
    
print(ans)
  

Fixed code:
n = int(input())

ans = 0


for i in range(1, n+1):
    if len(str(i)) % 2 == 1:
        ans += 1

print(ans)
Buggy code:
N = int(input())
ans = 0
for i in range(1,N+1):
  if len(i) % 2 == 1:
    ans += 1
print(ans)

Fixed code:
N = int(input())
ans = 0
for i in range(1,N+1):
  if len(str(i)) % 2 == 1:
    ans += 1
print(ans)
Buggy code:

def fn(i):
    return (1 <= i and i <= 9) or (100 <= i and i <= 999) or (10000 <= i and i <= 99999)


def main():
    n = int(input())

    x = list(range(n + 1)[1:])
    x = filter(fn, x)

    print(len(x))


if __name__ == '__main__':
    main()


Fixed code:

def fn(i):
    return (1 <= i and i <= 9) or (100 <= i and i <= 999) or (10000 <= i and i <= 99999)


def main():
    n = int(input())
    x = range(n + 1)[1:]
    x = tuple(filter(fn, x))

    print(len(x))


if __name__ == '__main__':
    main()
Buggy code:
N = input()
ans = 0
if len(N) % 2 == 0:
    a = len(N) - 1
    for i in range(1, a+1, 2):
        ans += 9*(10**(i-1))
else:
    a = len(N) - 2
    for i in range(1, a+1, 2):
        ans += 9*(10**i)
    ans += int(N) - 10**(len(N)-1) + 1

print(ans)


Fixed code:
N = input()
ans = 0
if len(N) % 2 == 0:
    a = len(N) - 1
    for i in range(1, a+1, 2):
        ans += 9*(10**(i-1))
else:
    a = len(N) - 2
    for i in range(1, a+1, 2):
        ans += 9*(10**(i-1))
    ans += int(N) - 10**(len(N)-1) + 1

print(ans)
Buggy code:
n = int(input())
count = 0
for i in range(1, n + 1):
    if len(str(i)) % 2 == 1:
		count += 1
print(count)

Fixed code:
n = int(input())
count = 0
for i in range(1, n + 1):
    if len(str(i)) % 2 == 1:
    	count += 1
print(count)