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114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
// find the value of D(G) algorithmically (see the paper)
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namespace dhrg {
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// c2-c1
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int cycle_minus(cell *c2, cell *c1) {
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int acc = 0;
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while(c1 != c2) c1 = ts::right_of(c1, celldist), acc++;
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return acc;
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}
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// c2 to the right from c1
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int unlimited_distance(cell *c2, cell *c1) {
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int at_least = cycle_minus(c2, c1);
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int steps = 0;
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while(true) {
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steps += 2;
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if(steps >= at_least) return at_least;
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c1 = ts::right_parent(c1, celldist);
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c2 = ts::left_parent(c2, celldist);
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int ndist = steps + cycle_minus(c2, c1);
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if(ndist < at_least) at_least = ndist;
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}
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}
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int gettypeof(cell *c) { return type_in_reduced(*(cgi.expansion), c, celldist); }
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vector<bool> grow_forever;
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set<vector<int>> checked;
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bool err = false;
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int my_sibling_limit;
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void find_sibling_limit(cell *c2, cell *c1) {
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if(err) return;
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if(celldist(c2) != celldist(c1)) {
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printf("not the same ring %d/%d\n", celldist(c1), celldist(c2));
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c1->item = itSilver;
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c2->item = itGold;
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err = true;
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return;
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}
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vector<int> signature;
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cell *cx = c1;
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cell *cy = c1;
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bool gf = false;
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while(cx != c2) {
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int t = gettypeof(cx);
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if(cx != c1 && grow_forever[t]) gf = true;
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signature.push_back(t); cy = cx; cx = ts::right_of(cx, celldist);
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}
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signature.push_back(gettypeof(cx)); signature.push_back(unlimited_distance(cy, c1) - unlimited_distance(c2, c1));
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if(checked.count(signature)) return;
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checked.insert(signature);
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// for(int v: signature) printf("%d ", v);
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int cm = cycle_minus(c2, c1);
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int ud = c1 == c2 ? -1 : 2 + unlimited_distance(ts::left_parent(c2, celldist), ts::right_parent(c1, celldist));
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// printf(": %d/%d {%p/%p} [%d]\n", cm, ud, c1, c2, my_sibling_limit);
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if(cm < ud && cm > my_sibling_limit) { my_sibling_limit = cm; }
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if(gf) return;
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int t1 = gettypeof(c1);
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int t2 = gettypeof(c2);
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for(int i1=0; i1<isize(cgi.expansion->children[t1]); i1++)
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for(int i2=0; i2<isize(cgi.expansion->children[t2]); i2++)
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if(c1 != c2 || i1 <= i2+1)
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find_sibling_limit(ts::child_number(c2, i2+1, celldist), ts::child_number(c1, i1, celldist));
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}
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void correct_sibling_limit() {
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my_sibling_limit = 0;
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if(S3 < 4) {
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grow_forever.clear();
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grow_forever.resize(cgi.expansion->N, true);
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while(true) {
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bool changed = false;
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for(int i=0; i<cgi.expansion->N; i++) if(grow_forever[i]) {
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grow_forever[i] = false;
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if(isize(cgi.expansion->children[i]) == 0)
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throw hr_exception("Error: our algorithm does not work if some vertices have no tree children");
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if(isize(cgi.expansion->children[i]) > 1)
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for(int c: cgi.expansion->children[i])
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if(grow_forever[c] || c == i) grow_forever[i] = true;
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if(!grow_forever[i]) changed = true;
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}
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if(!changed) break;
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}
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print(hlog, "The following grow forever:"); for(int i=0; i<cgi.expansion->N; i++) if(grow_forever[i]) print(hlog, " ", i); println(hlog);
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cell *root = currentmap->gamestart();
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my_sibling_limit = 0;
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forCellCM(c1, root) forCellCM(c2, root) find_sibling_limit(c2, c1);
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}
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println(hlog, "The correct value of sibling_limit is ", my_sibling_limit);
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cgi.expansion->sibling_limit = my_sibling_limit;
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}
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void regular_info() {
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indenter_finish im("regular_info");
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cgi.expansion->get_descendants(0);
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println(hlog, "growth = ", cgi.expansion->get_growth());
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// int typecount = expansion.N;
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correct_sibling_limit();
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}
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}
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