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Add RelTable generator lookup to prevent scanning unnecessary RelTables

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This commit is contained in:
JCRaymond
2019-12-25 00:04:35 -05:00
parent 55520fd50a
commit 8f82531a72
2 changed files with 26 additions and 17 deletions
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41
solver.cpp
View File

@@ -1,4 +1,5 @@
#include <vector>
#include <algorithm>
#include <queue>
#include <utility>
#include <functional>
@@ -138,7 +139,12 @@ struct Group {
Cosets cosets(ngens, init_row);
std::vector<RelTable> rel_tables;
std::vector<std::vector<int>> gen_map(ngens);
int rel_idx;
for (Mult m : get_mults()) {
rel_idx = rel_tables.size();
gen_map[m.gen0].push_back(rel_idx);
gen_map[m.gen1].push_back(rel_idx);
rel_tables.emplace_back(m);
}
@@ -155,6 +161,7 @@ struct Group {
}
int idx = 0;
int coset, gen, target, fact_idx, lst, gen_;
while (true) {
while (idx < cosets.data.size() and cosets.get(idx) >= 0)
idx++;
@@ -162,22 +169,22 @@ struct Group {
if (idx == cosets.data.size())
break;
int coset = idx / ngens;
int gen = idx % ngens;
int target = cosets.len;
target = cosets.len;
cosets.add_row();
for (RelTable &rel : rel_tables) {
rel.add_row();
}
std::priority_queue<int, std::vector<int>, std::greater<int>> facts;
facts.push(coset*ngens + gen);
std::vector<int> facts;
facts.push_back(idx);
coset = idx / ngens;
gen = idx % ngens;
while (!facts.empty()) {
int fact_idx = facts.top();
facts.pop();
fact_idx = facts.back();
facts.pop_back();
if (cosets.get(fact_idx) != -1)
continue;
@@ -187,9 +194,9 @@ struct Group {
coset = fact_idx / ngens;
gen = fact_idx % ngens;
for (RelTable &rel : rel_tables) {
if ( (gen == rel.gens[0] or gen == rel.gens[1]) and (rel.fam[target] == -1) ) {
for (int rel_idx : gen_map[gen]) {
RelTable &rel = rel_tables[rel_idx];
if ( rel.fam[target] == -1 ) {
rel.fam[target] = rel.fam[coset];
rel.gen[target] = rel.gen[coset] + 1;
@@ -197,19 +204,21 @@ struct Group {
rel.gen[target] -= 2;
if (rel.gen[target] == rel.mult) {
int lst = rel.lst[rel.fam[target]];
int gen_ = rel.gens[(int)(rel.gens[0] == gen)];
facts.push(lst*ngens + gen_);
lst = rel.lst[rel.fam[target]];
gen_ = rel.gens[(int)(rel.gens[0] == gen)];
facts.push_back(lst*ngens + gen_);
}
else if (rel.gen[target] == -rel.mult) {
int gen_ = rel.gens[rel.gens[0] == gen];
facts.push(target*ngens + gen_);
gen_ = rel.gens[rel.gens[0] == gen];
facts.push_back(target*ngens + gen_);
}
else if (rel.gen[target] == rel.mult - 1) {
rel.lst[rel.fam[target]] = target;
}
}
}
std::sort(facts.begin(), facts.end(), std::greater<int>());
}
for (RelTable &rel : rel_tables) {

2
test.cpp
View File

@@ -3,7 +3,7 @@
#include <iostream>
int main() {
Group g = E(7);
Group g = B(9);
auto s = std::chrono::system_clock::now();
auto cosets = g.solve();