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Merge pull request #1799 from c-cube/fix-union-find

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fix(union-find): keep values and representative in consistent order
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Nikolaj Bjorner 2018-08-18 05:51:01 -07:00 • committed by GitHub
commit d6298b089d
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1 changed files with 3 additions and 1 deletions
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4
src/util/union_find.h
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@ -122,8 +122,10 @@ public:
TRACE("union_find", tout << "merging " << r1 << " " << r2 << "\n";);
if (r1 == r2)
return;
if (m_size[r1] > m_size[r2])
if (m_size[r1] > m_size[r2]) {
std::swap(r1, r2);
std::swap(v1, v2);
}
m_ctx.merge_eh(r2, r1, v2, v1);
m_find[r1] = r2;
m_size[r2] += m_size[r1];