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bazoka-geometry's Introduction

Bazoka13Geometry

List

⭕: solved

⚪: solved but maybe forget

Empty: not solved

√:solved by mouth

Index Name Done
1 [Petrozavodsk Winter-2016. JAG Contest I](I - Shortest Bridge (atcoder.jp))
2 National Taiwan U Selection. G
3 Northern Subregional 2015 K
4 Battle of the Giants 2013 : Hideouts
5 2016 ACM-ICPC World Finals J
6 JAG Practice 2010 : Alice and Bomb
7 JAG Summer 2009 Day2 : Symmetry
8 Japan Regional 2014 : Cornering at Poles
9 AIZU 1313 Intersection of Two Prisms
10 Exhausted Robot - UVALive 6539(vjudge.net)
11 WF 2014 L
12 Shoot - UVALive 6635
13 2016 China-Final K
14 2016 ACM-ICPC World Finals H
15 WF 2012 H
16 NEERC 2009 Asteroids
17 ftiasch’s Contest 5 J
18 WF 2014 F
19 WF 2014 J
20 2. Battle Mage — Prime New Year Contest - 2016 — SnarkNews New Year Contests - 2017 (yandex.com)
21 3. Ancient City — Prime New Year Contest - 2016 — SnarkNews New Year Contests - 2017 (yandex.com)
22 31. Votter and Paul De Mort — Prime New Year Contest - 2016 — SnarkNews New Year Contests - 2017 (yandex.com)
23 2014 Problem 5. Garbage problem
24 2014 Problem 11. Cover WiFi
25 Dashboard - 2014 Winter Programming School, Kharkiv, day 9 (V. Nespirtny). High league - W
26 2014 Problem 19. Pizza
27 2014 Problem 41. Faster Than Light
28 3. Area of Effect — Простой Новогодний Контест 2015 — SnarkNews New Year Contests - 2016 (yandex.com)
29 11. Solar Lamps — Простой Новогодний Контест 2015 — SnarkNews New Year Contests - 2016 (yandex.com)
30 29. Land Division — Простой Новогодний Контест 2015 — SnarkNews New Year Contests - 2016 (yandex.com)
31 Dashboard - 2013-2014 ACM-ICPC, NEERC, Moscow Subregional Contest - E
32 Dashboard - 2013-2014 ACM-ICPC Northeastern European Regional Contest (NEERC 13) - E
33 EC Final 2015 - Convex Polyhedron
34 0x11 Ural Championship (2013) H
35 WF 2008 C
36 WF 2008 H
37 NEERC 2012 Kingdom Reunion
38 UVA 12513 - Safe Places
39 UVA 12305 - Polishing a Extruded Polygon
40 Petr Mitrichev Contest 5 D. Circular Island
41 WF 2015 B
42 2016 ACM-ICPC World Finals G
43 Simple Polygon
44 WF 2012 J
45 WF 2013 G
46 POJ 3575

7

好像是道垃圾题啊。。如果对称轴是对的那么某点的坐标应该是round()-ini<=eps,然后就枚举对称轴set存一下坐标就行了,但是有组数据我和正解不一样啊。。迷惑,题面也挺迷惑的。。。

9

3D半平面交。。

只会 $n^2$ 。。用inf搓了个大立方体出来,然后每次3DconvexCut,但是法向量方向好恶心啊。。

不过好像可以考虑 $x$ 分段积分体积?麻

31

类似于旋转卡壳的东西,只不过只有一条直线,然后绕着转一圈就好了,是线性的

但是这道题。。。好像spj有问题,而且精度也很恶心,甚至不加快读还T了(总之就很恶心)

32

todo:证明过程

题解的结论,对于左端点固定的矩形,右端点右移过程面积是单峰的,可以三分最大值,而对于左端点,最大值是单峰的,所以三分套三分就行了

求面积我拆了上下链,相比直接求直线和凸包交可能会好一点(?

40

显然分割线只有几种情况,多边形的边、切线、还要考虑和圆心连线的垂线(一个点)

但是精度吃shit了(精度数据能不能死一死)

43

大概就是n条线段是否严格相交(虽然题意说的很屎),然后把每条线段都向内缩一个eps的话,就可以看作线段相交了

然后 nlogn 扫描线判交就可以了

46

竖着二分就行了,每次切掉其他人的面积一定\leq s_i/n

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