PersistentUnionFind = ref object
  count*: int
  size: int
  height: int
  node: int32
  pool: PersistentUFPool

CPLIB_COLLECTIONS_PERSISTENT_UNIONFIND = 1

proc initPersistentUnionFind(N: int): PersistentUnionFind {....raises: [], tags: [].}

proc issame(self: PersistentUnionFind; x: int; y: int): bool {....raises: [],
    tags: [].}

proc root(self: PersistentUnionFind; x: int): int {....raises: [], tags: [].}

proc siz(self: PersistentUnionFind; x: int): int {....raises: [], tags: [].}

proc unite(self: PersistentUnionFind; x: int; y: int): PersistentUnionFind {.
    ...raises: [], tags: [].}