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Fix #3170: discard a redundant variable bound instead of substituting it as if tight #3172

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Fix #3170: discard a redundant variable bound instead of substituting it as if tight #3172

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10 changes: 10 additions & 0 deletions highs/mip/HighsTransformedLp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,11 @@ bool HighsTransformedLp::transform(std::vector<double>& vals,
mip.mipdata_->implications.cleanupVub(col, bestVub[col].first,
bestVub[col].second, ub, redundant,
infeasible, false);
if (redundant) {
bestVub[col].first = -1;
ubDist[col] = simpleUbDist[col];
boundDist[col] = std::min(lbDist[col], ubDist[col]);
}
}

// the code below uses the difference between the column upper and lower
Expand All @@ -210,6 +215,11 @@ bool HighsTransformedLp::transform(std::vector<double>& vals,
mip.mipdata_->implications.cleanupVlb(col, bestVlb[col].first,
bestVlb[col].second, lb, redundant,
infeasible, false);
if (redundant) {
bestVlb[col].first = -1;
lbDist[col] = simpleLbDist[col];
boundDist[col] = std::min(lbDist[col], ubDist[col]);
}
}

// store the old bound type so that we can restore it if the continuous
Expand Down