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from ..utils._typedefs cimport intp_t
cdef class UnionFind:
cdef intp_t next_label
cdef intp_t[:] parent
cdef intp_t[:] size
cdef void union(self, intp_t m, intp_t n) noexcept
cdef intp_t fast_find(self, intp_t n) noexcept
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