Buggy python submission (verdict: Runtime Error):
n,m=map(int,input().split())
bridge=[[] for i in range(m)]
leader=[i for i in range(n+1)]
member=[1 for i in range(n+1)]
for i in range(m):
    bridge[i]=list(map(int,input().split()))
ans=[0 for i in range(m+1)]
ans[0]=int((n-1)*n/2)
k=1
for i in reversed(bridge):
    le0=leader[i[0]]
    le1=leader[i[1]]
    if le0!=le1:
        ans[k]=ans[k-1]-member[le0]*member[le1]
        if member[le0]>=member[le1]:
            member[le0]+=member[le1]
            leader=[le0 if i==le1 else i for i in leader]
        else:
            member[le1]+=member[le0]
            leader=[le1 if i==le0 else i for i in leader]
    else:
        ans[k]=ans[k-1]
    if ans[k]==0:
        ans[k:]=[0 for l in range(m-k)]
        break
    k+=1
for i in range(m):
    print(ans[m-1-i])

Fixed submission:
a,b=map(int,input().split())
j=0
while b>=2**j:
    j+=1
if b==0:
    j=1
k=1
l=[0 for i in range(j)]
bia=[0 for i in range(j)]
A=a
i=0
while A>2**(k-1):
    l[i]=A%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bia[i]=0
    else:
        if m%2==1:
            bia[i]=1
        else:
            bia[i]=0
    k+=1
    i+=1
if (A//2)%2==0:
    bia[0]=0
else:
    bia[0]=1
k=1
l=[0 for i in range(j)]
bib=[0 for i in range(j)]
B=b+1
i=0
while B>2**(k-1):
    l[i]=B%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bib[i]=0
    else:
        if m%2==1:
            bib[i]=1
        else:
            bib[i]=0
    k+=1
    i+=1
if (B//2)%2==0:
    bib[0]=0
else:
    bib[0]=1
ans=0
for i in range(j):
    if bia[i]==bib[i]:
        ans=ans
    else:
        ans+=2**i
print(ans)

Buggy python submission (verdict: Runtime Error):
a,b=map(int,input().split())
j=0
while b>=2**j:
    j+=1
k=1
l=[0 for i in range(j)]
bia=[0 for i in range(j)]
A=a
i=0
while A>2**(k-1):
    l[i]=A%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bia[i]=0
    else:
        if m%2==1:
            bia[i]=1
        else:
            bia[i]=0
    k+=1
    i+=1
if (A//2)%2==0:
    bia[0]=0
else:
    bia[0]=1
k=1
l=[0 for i in range(j)]
bib=[0 for i in range(j)]
B=b+1
i=0
while B>2**(k-1):
    l[i]=B%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bib[i]=0
    else:
        if m%2==1:
            bib[i]=1
        else:
            bib[i]=0
    k+=1
    i+=1
if (B//2)%2==0:
    bib[0]=0
else:
    bib[0]=1
ans=0
for i in range(j):
    if bia[i]==bib[i]:
        ans=ans
    else:
        ans+=2**i
print(ans)

Fixed submission:
a,b=map(int,input().split())
j=0
while b>=2**j:
    j+=1
if b==0:
    j=1
k=1
l=[0 for i in range(j)]
bia=[0 for i in range(j)]
A=a
i=0
while A>2**(k-1):
    l[i]=A%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bia[i]=0
    else:
        if m%2==1:
            bia[i]=1
        else:
            bia[i]=0
    k+=1
    i+=1
if (A//2)%2==0:
    bia[0]=0
else:
    bia[0]=1
k=1
l=[0 for i in range(j)]
bib=[0 for i in range(j)]
B=b+1
i=0
while B>2**(k-1):
    l[i]=B%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bib[i]=0
    else:
        if m%2==1:
            bib[i]=1
        else:
            bib[i]=0
    k+=1
    i+=1
if (B//2)%2==0:
    bib[0]=0
else:
    bib[0]=1
ans=0
for i in range(j):
    if bia[i]==bib[i]:
        ans=ans
    else:
        ans+=2**i
print(ans)

Buggy python submission (verdict: Runtime Error):
a,b=map(int,input().split())
j=0
while b>2**j:
    j+=1
k=1
l=[0 for i in range(j)]
bia=[0 for i in range(j)]
A=a
i=0
while A>2**(k-1):
    l[i]=A%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bia[i]=0
    else:
        if m%2==1:
            bia[i]=1
        else:
            bia[i]=0
    k+=1
    i+=1
if (A//2)%2==0:
    bia[0]=0
else:
    bia[0]=1
k=1
l=[0 for i in range(j)]
bib=[0 for i in range(j)]
B=b+1
i=0
while B>2**(k-1):
    l[i]=B%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bib[i]=0
    else:
        if m%2==1:
            bib[i]=1
        else:
            bib[i]=0
    k+=1
    i+=1
if (B//2)%2==0:
    bib[0]=0
else:
    bib[0]=1
ans=0
for i in range(j):
    if bia[i]==bib[i]:
        ans=ans
    else:
        ans+=2**i
print(ans)

Fixed submission:
a,b=map(int,input().split())
j=0
while b>=2**j:
    j+=1
if b==0:
    j=1
k=1
l=[0 for i in range(j)]
bia=[0 for i in range(j)]
A=a
i=0
while A>2**(k-1):
    l[i]=A%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bia[i]=0
    else:
        if m%2==1:
            bia[i]=1
        else:
            bia[i]=0
    k+=1
    i+=1
if (A//2)%2==0:
    bia[0]=0
else:
    bia[0]=1
k=1
l=[0 for i in range(j)]
bib=[0 for i in range(j)]
B=b+1
i=0
while B>2**(k-1):
    l[i]=B%(2**k)
    m=(l[i]-2**(k-1))
    if m<=0:
        bib[i]=0
    else:
        if m%2==1:
            bib[i]=1
        else:
            bib[i]=0
    k+=1
    i+=1
if (B//2)%2==0:
    bib[0]=0
else:
    bib[0]=1
ans=0
for i in range(j):
    if bia[i]==bib[i]:
        ans=ans
    else:
        ans+=2**i
print(ans)