Problem p03855 (python)

Fixed submission:
import sys
from collections import defaultdict
input = sys.stdin.readline


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 union(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()}

    def __str__(self):
        return '\n'.join('{}: {}'.format(r, self.members(r)) for r in self.roots())


n, k, l = map(int, input().split())
uf_k = UnionFind(n)
uf_l = UnionFind(n)
for i in range(k):
    p, q = map(int, input().split())
    uf_k.union(p - 1, q - 1)
for i in range(l):
    r, s = map(int, input().split())
    uf_l.union(r - 1, s - 1)
d = defaultdict(int)
for i in range(n):
    d[uf_k.find(i), uf_l.find(i)] += 1
print(*(d[uf_k.find(i), uf_l.find(i)] for i in range(n)))

Buggy submission (verdict: Runtime Error):
import sys
from collections import defaultdict
input = sys.stdin.readline


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 union(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()}

    def __str__(self):
        return '\n'.join('{}: {}'.format(r, self.members(r)) for r in self.roots())


n, k, l = map(int, input().split())
uf_k = UnionFind(n)
uf_l = UnionFind(n)
for i in range(k):
    p, q = map(int, input().split())
    uf_k.union(p - 1, q - 1)
for i in range(l):
    r, s = map(int, input().split())
    uf_l.union(r - 1, s - 1)
d = defaultdict(int)
for i in range(n):
    d[uf_k.find(i), uf_l.find(i)] += 1
print(*d[uf_k.find(i), uf_l.find(i)] for i in range(n))