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Convex hull problems
Problem Name Online Judge Year Contest Difficulty Level
1 Convex Hull of Lattice Points Categories Live Archive 2009 North America - Greater NY 1
2 Onion Layers Categories Live Archive 2006 Latin America - South America 1
3 Build the Fence Categories SPOJ 1
4 Land Acquisition Categories SPOJ 2
5 Moth Eradication Categories UVA 2
6 SCUD Busters Categories UVA 2
7 Useless Tile Packers Categories UVA 2
8 Convex Hull Finding Categories UVA 2
9 Military Story Categories SPOJ 3
10 Doors and Penguins Categories SPOJ 3
11 Commando Categories SPOJ 3
12 Convex Hull Categories UVA 3
13 The Fortified Forest Categories UVA 3
14 Cops and Robbers Categories UVA 4
15 Good Inflation Categories SPOJ 4
16 Separate Points Categories SPOJ 4
17 Two Ball Game Categories SPOJ 5
18 Perfume Categories SPOJ 5
19 Buy Low Sell High Categories Codeforces MemSQL Start[c]UP 3.0 - Round 2 (onsite finalists) 6
20 Boundary Points Categories UVA 6
21 Counting Divisors Categories SPOJ 9
22 Amazing Factor Sequence (hard) Categories SPOJ 10