• Junjie Gu's avatar
    All nodes of congruent class (CC) are linked. The previous · 3bb520c8
    Junjie Gu authored
    implementation keeps an isolated node in that link. This change
    will remove an isolated node from the link and put it in a
    separate congruent class (single-valued, thus isolated).
    This change will make it be able to do re-union nodes from different
    congruent class later after DeSSA is done. And this change seems
    easier to understand as well.
    The first version of this change had a bug (did not reset leader
    always once a node is removed), which is fixed in this change.
    Also, for the existing Path Halving (getLeader), it did not set
    the parent node correctly, though this is not correctness issue
    but bad for performance, which is also fixed in this change
    Change-Id: I8976dd394d24034cef388f4fbe4e2f77be62af79
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