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fix(union-find): keep values and representative in consistent order

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the merge handlers should be called with r1,r2,v1,v2 or r2,r1,v2,v1
but not a mix
This commit is contained in:
Simon Cruanes 2018-08-17 14:58:44 -05:00
parent 12f9336fec
commit 5141f05e6d
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];