Problem p03857 (python)

Fixed submission:
from collections import defaultdict
class UnionFind():
    def __init__(self,n):
        self.n=n
        self.parents=[-1]*n
    def find(self,x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x]=self.find(self.parents[x])
            return self.parents[x]
    def unite(self,x,y):
        x = self.find(x)
        y = self.find(y)
        if x==y:
            return
        if self.parents[x]>self.parents[y]:
            x,y=y,x
        self.parents[x]+=self.parents[y]
        self.parents[y]=x
    def size(self, x):
        return -self.parents[self.find(x)]
    def same(self, x, y):
        return self.find(x) == self.find(y)
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i)==root]
    def roots(self):
        return [i for i,x in enumerate(self.parents) if x<0]
    def group_count(self):
        return len(self.roots())
    def all_group_members(self):
        return {r: self.members(r) for r in self.roots()}

n,k,l=map(int,input().split())
uf1=UnionFind(n)
uf2=UnionFind(n)
for _ in range(k):
  u,v=map(int,input().split())
  uf1.unite(u-1,v-1)
for _ in range(l):
  u,v=map(int,input().split())
  uf2.unite(u-1,v-1)
d=defaultdict(int)
for i in range(n):
  d[(uf1.find(i),uf2.find(i))]+=1
ans=[d[(uf1.find(i),uf2.find(i))] for i in range(n)]
print(*ans)

Buggy submission (verdict: Runtime Error):
class UnionFind():
    def __init__(self,n):
        self.n=n
        self.parents=[-1]*n
    def find(self,x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x]=self.find(self.parents[x])
            return self.parents[x]
    def unite(self,x,y):
        x = self.find(x)
        y = self.find(y)
        if x==y:
            return
        if self.parents[x]>self.parents[y]:
            x,y=y,x
        self.parents[x]+=self.parents[y]
        self.parents[y]=x
    def size(self, x):
        return -self.parents[self.find(x)]
    def same(self, x, y):
        return self.find(x) == self.find(y)
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i)==root]
    def roots(self):
        return [i for i,x in enumerate(self.parents) if x<0]
    def group_count(self):
        return len(self.roots())
    def all_group_members(self):
        return {r: self.members(r) for r in self.roots()}

n,k,l=map(int,input().split())
uf1=UnionFind(n)
uf2=UnionFind(n)
for _ in range(k):
  u,v=map(int,input().split())
  uf1.unite(u-1,v-1)
for _ in range(k):
  u,v=map(int,input().split())
  uf2.unite(u-1,v-1)
ans=[]
for i in range(n):
  x=set(uf1.members(i))&set(uf2.members(i))
  ans.append(len(x))
print(*ans)

Buggy submission (verdict: Runtime Error):
class UnionFind():
    def __init__(self,n):
        self.n=n
        self.parents=[-1]*n
    def find(self,x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x]=self.find(self.parents[x])
            return self.parents[x]
    def unite(self,x,y):
        x = self.find(x)
        y = self.find(y)
        if x==y:
            return
        if self.parents[x]>self.parents[y]:
            x,y=y,x
        self.parents[x]+=self.parents[y]
        self.parents[y]=x
    def size(self, x):
        return -self.parents[self.find(x)]
    def same(self, x, y):
        return self.find(x) == self.find(y)
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i)==root]
    def roots(self):
        return [i for i,x in enumerate(self.parents) if x<0]
    def group_count(self):
        return len(self.roots())
    def all_group_members(self):
        return {r: self.members(r) for r in self.roots()}

n,k,l=map(int,input().split())
uf1=UnionFind(n)
uf2=UnionFind(n)
for _ in range(k):
  u,v=map(int,input().split())
  uf1.unite(u-1,v-1)
for _ in range(k):
  u,v=map(int,input().split())
  uf2.unite(u-1,v-1)
ans=[]
for i in range(n):
  x=set(uf1.members(i))&set(uf2.members(i))
  ans.append(len(x))
print(*ans)