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allow gomory cut for a row with free non-basic vars

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2018-09-06 16:47:25 -07:00
parent de4a2b3ea7
commit 064cf9e983
5 changed files with 81 additions and 54 deletions
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28
src/util/lp/int_solver.h
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@ -33,6 +33,31 @@ class lar_solver;
template <typename T, typename X>
struct lp_constraint;
struct ineq {
lp::lconstraint_kind m_cmp;
lp::lar_term m_term;
ineq(lp::lconstraint_kind cmp, const lp::lar_term& term) : m_cmp(cmp), m_term(term) {}
ineq() {} // empty constructor
void add_coeff_var(const mpq& c, unsigned j) {
m_term.add_coeff_var(c, j);
}
bool holds(const vector<impq> & x) const {
auto v = m_term.apply(x);
switch(m_cmp) {
case lconstraint_kind::LE: return v <= zero_of_type<impq>();
case lconstraint_kind::LT: return v < zero_of_type<impq>();
case lconstraint_kind::GE: return v >= zero_of_type<impq>();
case lconstraint_kind::GT: return v > zero_of_type<impq>();
case lconstraint_kind::EQ: return v == zero_of_type<impq>();
default:
lp_assert(false);
return false;
}
}
bool is_empty() const { return m_term.is_empty(); }
};
typedef vector<ineq> lemma;
class int_solver {
public:
@ -54,7 +79,6 @@ public:
mpq const& get_offset() const { return m_k; }
explanation const& get_explanation() const { return m_ex; }
bool is_upper() const { return m_upper; }
bool is_base(unsigned j) const;
bool is_real(unsigned j) const;
const impq & lower_bound(unsigned j) const;
@ -116,6 +140,7 @@ private:
unsigned row_of_basic_column(unsigned j) const;
public:
std::ostream & print_ineq(const ineq & in, std::ostream & out) const;
void display_column(std::ostream & out, unsigned j) const;
constraint_index column_upper_bound_constraint(unsigned j) const;
constraint_index column_lower_bound_constraint(unsigned j) const;
@ -140,6 +165,7 @@ public:
int find_inf_int_nbasis_column() const;
lia_move run_gcd_test();
lia_move gomory_cut();
void add_free_vars_ineqs_to_lemma();
lia_move hnf_cut();
lia_move make_hnf_cut();
bool init_terms_for_hnf_cut();