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 --- test/geometry/segmentIntersection.cpp | 88 +++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 test/geometry/segmentIntersection.cpp (limited to 'test/geometry/segmentIntersection.cpp') diff --git a/test/geometry/segmentIntersection.cpp b/test/geometry/segmentIntersection.cpp new file mode 100644 index 0000000..9862be5 --- /dev/null +++ b/test/geometry/segmentIntersection.cpp @@ -0,0 +1,88 @@ +#include "../util.h" +constexpr ll EPS = 0; +#define double ll +#define polar polar +#include +#undef polar +#undef double + +// Liegt p auf der Strecke a-b? +bool pointOnLineSegment(pt a, pt b, pt p) { + if (cross(a, b, p) != 0) return false; + double dist = norm(a - b); + return norm(a - p) <= dist && norm(b - p) <= dist; +} + +// Test auf Streckenschnitt zwischen a-b und c-d. +bool lineSegmentIntersection(pt a, pt b, pt c, pt d) { + if (ccw(a, b, c) == 0 && ccw(a, b, d) == 0) + return pointOnLineSegment(a,b,c) || + pointOnLineSegment(a,b,d) || + pointOnLineSegment(c,d,a) || + pointOnLineSegment(c,d,b); + return ccw(a, b, c) * ccw(a, b, d) <= 0 && + ccw(c, d, a) * ccw(c, d, b) <= 0; +} + +#include + +vector randomSegs(int n, ll range) { + auto ps = Random::points(n, -range, range); + vector segs(n); + for (int i = 0; i < n; i++) { + pt b; + do { + b = Random::point(-pow(range, 0.8), pow(range, 0.8)); + } while(norm(b) == 0); + segs[i] = {ps[i], ps[i] + b, i}; + } + return segs; +} + +bool naive(vector& segs) { + for (ll i = 0; i < sz(segs); i++) { + for (ll j = 0; j < i; j++) { + if (lineSegmentIntersection(segs[i].a, segs[i].b, segs[j].a, segs[j].b)) return true; + } + } + return false; +} + +void stress_test(ll range) { + ll queries = 0; + ll intersection = 0; + ll notIntersection = 0; + for (int tries = 0; tries < 100'000; tries++) { + int n = Random::integer(2, 100); + auto segs = randomSegs(n, range); + auto [a, b] = intersect(segs); + bool got = a >= 0; + if (got != (b >= 0)) cerr << "error: invalid ans" << FAIL; + auto expected = naive(segs); + if (got != expected) cerr << "error: intersection not found" << FAIL; + if (got && !lineSegmentIntersection(segs[a].a, segs[a].b, segs[b].a, segs[b].b)) cerr << "error: no intersection" << FAIL; + queries += n; + intersection += got; + notIntersection += !got; + } + cerr << "tested random queries: " << queries << "(" << intersection << ":" << notIntersection << ")" << endl; +} + +constexpr int N = 1'000'000; +void performance_test() { + timer t; + auto segs = randomSegs(N, 1'000'000'000); + + t.start(); + hash_t hash = intersect(segs).first; + t.stop(); + + if (t.time > 500) cerr << "too slow: " << t.time << FAIL; + cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl; +} + +int main() { + stress_test(100); + stress_test(1'000'000'000); + performance_test(); +} -- cgit v1.2.3