Geometry

**Frequency: 2/10** Often appear in ICPC.

Resources

- [CP Algorithms: Basic Geometry](https://cp-algorithms.com/geometry/basic-geometry.html)

Three points	133 / 149	1000
Line segment intersection	73 / 98	1100
Line intersection	50 / 60	1100
Quadrilateral classification	36 / 49	1100
Point location	42 / 53	1100
Triangle classification	41 / 42	1200
Polygon area	65 / 68	1200
Distance to polygon	34 / 41	1400
Convex hull	63 / 72	1500
Perpendicular pairs	25 / 35	1600
Maximum quadrilateral	30 / 64	1700
Catching butterflies	3 / 9	2200