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fix a bug in gt_on_powers_mul_same_degree()

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-01-08 09:59:14 -08:00
parent 2b7393778e
commit 35efc91aff
1 changed files with 10 additions and 14 deletions
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24
src/math/lp/nex_creator.cpp
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@ -109,6 +109,7 @@ void nex_creator::simplify_children_of_mul(vector<nex_pow> & children, rational&
template <typename T>
bool nex_creator::gt_on_powers_mul_same_degree(const T& a, const nex_mul& b) const {
bool ret = false;
std::cout << "'";
unsigned a_pow = a.begin()->pow();
unsigned b_pow = b.begin()->pow();
for (auto it_a = a.begin(), it_b = b.begin(); it_a != a.end() && it_b != b.end(); ) {
@ -120,24 +121,19 @@ bool nex_creator::gt_on_powers_mul_same_degree(const T& a, const nex_mul& b) con
ret = false;
break;
}
if (a_pow > b_pow) { // b should be advanced
b_pow -= a_pow;
++it_b;
if (it_b != b.end()) b_pow = it_b->pow();
if (a_pow > b_pow) {
ret = true;
break;
}
else if (a_pow < b_pow) { // a should be advanced
b_pow -= a_pow;
++it_a;
if (it_a != a.end()) a_pow = it_a->pow();
if (a_pow < b_pow) {
ret = false;
break;
}
else {
++it_a;
++it_b;
if (it_a != a.end()) a_pow = it_a->pow();
if (it_b != b.end()) b_pow = it_b->pow();
}
++it_a;
++it_b;
if (it_a != a.end()) a_pow = it_a->pow();
if (it_b != b.end()) b_pow = it_b->pow();
}
TRACE("nex_gt", tout << "a = "; print_vector(a, tout) << (ret?" > ":" <= ") << b << "\n";);
return ret;