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fix coefficient extraction and passing in Farkas lemmas, thanks to H. F. Bryant

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-07-07 09:28:47 -07:00
parent 68663fd97a
commit 0ab102cbec
3 changed files with 18 additions and 2 deletions
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17
src/sat/smt/arith_diagnostics.cpp
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@ -136,9 +136,22 @@ namespace arith {
arith_proof_hint const* solver::explain_conflict(sat::literal_vector const& core, euf::enode_pair_vector const& eqs) {
arith_proof_hint* hint = nullptr;
if (ctx.use_drat()) {
m_coeffs.reset();
for (auto const& e : m_explanation) {
if (inequality_source == m_constraint_sources[e.ci()])
m_coeffs.push_back(e.coeff());
}
m_arith_hint.set_type(ctx, hint_type::farkas_h);
for (auto lit : core)
m_arith_hint.add_lit(rational::one(), lit);
if (m_coeffs.size() == core.size()) {
unsigned i = 0;
for (auto lit : core)
m_arith_hint.add_lit(m_coeffs[i], lit), ++i;
}
else {
for (auto lit : core)
m_arith_hint.add_lit(rational::one(), lit);
}
for (auto const& [a,b] : eqs)
m_arith_hint.add_eq(a, b);
hint = m_arith_hint.mk(ctx);