求助，Python3 OOP代码，全部RE，本地可以正常运行

class Union_find_set(object):
    def __init__(self, n):
        self.__fa = list(range(n))
        self.__size = [1] * n
    def __findfa(self, x):
        if x == self.__fa[x]:
            return x
        else:
            self.__fa[x] = self.__findfa(self.__fa[x])
            return self.__fa[x]
    def find_father(self, x):
        return self.__findfa(x)
    def same_set(self, x, y):
        return self.__findfa(x) == self.__findfa(y)
    def union_set(self, x, y):
        fx, fy = self.__findfa(x), self.__findfa(y)
        if fx == fy:
            return None
        if self.__size[fx] < self.__size[fy]:
            self.__fa[fx] = fy
            self.__size[fy] += self.__size[fx]
        else:
            self.__fa[fy] = fx
            self.__size[fx] += self.__size[fy]

n, m = [int(x) for x in input().split(' ') if x.isdigit()]
ufs = Union_find_set(n)
for t in range(m):
    z, x, y = [int(x) for x in input().split(' ') if x.isdigit()]
    x, y = x - 1, y - 1
    if z == 1:
        ufs.union_set(x, y)
    elif ufs.same_set(x, y):
        print('Y')
    else:
        print('N')

最近学了Python，本想用这个并查集写一个类来练练手，但是交上去全是RE，下载了测试数据，在本地是可以正常运行的，想问问大佬这是什么情况？