From 8d11c6c8213f46f0fa19826917c255edd5d43cb1 Mon Sep 17 00:00:00 2001 From: mzuenni Date: Sun, 28 Jul 2024 22:54:40 +0200 Subject: Test (#4) * update * moved content in subdir * rename file * add test setup * add test setup * add github action * automaticly test all cpp files * timeout after 10s * setulimit and dont zero memory * test build pdf * install latexmk * update * update * ngerman * fonts * removed old code * add first test * added tests * test in sorted order * more tests * simplified test * more tests * fix suffix tree * fixes and improvements * done ust lst directly * fix swap * add links to pdf * fix constants * add primorial * add comment * various improvements * more tests * added missing stuf * more tests * fix tests * more tests * more tests * more tests * fix recursion? * test trie * more tests * only use python temporarily for listings * only use python temporarily for listings * more tests * fix longestCommonSubstring * more tests * more tests * made code more similiar * fix? * more tests * more tests * more tests * add ahoCorasick test + limit 4GB stack size * more tests * fix test * add additional test * more tests * more tests * fix? * better fix * fix virtual tree * more tests * more tests * recursive closest pair * more tests * decrease limit * new tests * more tests * fix name * more tests * add test * new test * more tests * more tests * more tests * more tests * new test and content * new code * new code * larger tests * fix and test * new test * new test * update pdf * remove comments * new test * more tests * more testcases * more tests * increased limit * more tests * more tests * more tests * new tests * more tests * shortened code * new test * add basic tests for bigint * more tests * removed old files * new test * ignore some files * more auto more ccw * fix test * more tests * fix * new tests * more tests * more tests * stronger test * actually verify delaunay... * more tests * fix header * more tests * run tests parallel? * test parralel? * add --missing * separate workflows * test * is the pdf checked? * separate workflows * fix workflow * more workflows --------- Co-authored-by: Yidi --- content/geometry/segmentIntersection.cpp | 63 ++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 content/geometry/segmentIntersection.cpp (limited to 'content/geometry/segmentIntersection.cpp') diff --git a/content/geometry/segmentIntersection.cpp b/content/geometry/segmentIntersection.cpp new file mode 100644 index 0000000..4262ddc --- /dev/null +++ b/content/geometry/segmentIntersection.cpp @@ -0,0 +1,63 @@ +struct seg { + pt a, b; + int id; + bool operator<(const seg& o) const { + if (real(a) < real(o.a)) { + int s = ccw(a, b, o.a); + return (s > 0 || (s == 0 && imag(a) < imag(o.a))); + } else if (real(a) > real(o.a)) { + int s = ccw(o.a, o.b, a); + return (s < 0 || (s == 0 && imag(a) < imag(o.a))); + } + return imag(a) < imag(o.a); + } +}; + +struct event { + pt p; + int id, type; + bool operator<(const event& o) const { + if (real(p) != real(o.p)) return real(p) < real(o.p); + if (type != o.type) return type > o.type; + return imag(p) < imag(o.p); + } +}; + +bool lessPT(const pt& a, const pt& b) { + return real(a) != real(b) ? real(a) < real(b) + : imag(a) < imag(b); +} + +bool intersect(const seg& a, const seg& b) { + return lineSegmentIntersection(a.a, a.b, b.a, b.b); +} + +pair intersect(vector& segs) { + vector events; + for (seg& s : segs) { + if (lessPT(s.b, s.a)) swap(s.b, s.a); + events.push_back({s.a, s.id, 1}); + events.push_back({s.b, s.id, -1}); + } + sort(all(events)); + + set q; + vector::iterator> where(sz(segs)); + for (auto e : events) { + int id = e.id; + if (e.type > 0) { + auto it = q.lower_bound(segs[id]); + if (it != q.end() && intersect(*it, segs[id])) + return {it->id, segs[id].id}; + if (it != q.begin() && intersect(*prev(it), segs[id])) + return {prev(it)->id, segs[id].id}; + where[id] = q.insert(it, segs[id]); + } else { + auto it = where[id]; + if (it != q.begin() && next(it) != q.end() && intersect(*next(it), *prev(it))) + return {next(it)->id, prev(it)->id}; + q.erase(it); + } + } + return {-1, -1}; +} -- cgit v1.2.3