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Problems

Geometry
Difficulty
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3925
Intersection
Hard
3928
Fence
Very hard
3978
The Red Gem
Hard
3980
The Worm in the Apple
Hard
4016
Tracking RFIDs
4061
A Look at the Sky
Very easy
4065
Broken Nail
Very hard
4067
Electronic Hunting
Very hard
4068
Convex Hulls
Very hard
4069
Toll Roads
Very hard
4084
Figure
Hard
4091
Probability Through experiment
Very hard
4092
Optimal Space Way
4093
Radiation
Easy
4100
Titanic
Easy
4109
Combining Rectangles
Easy
4118
Frontier
Easy
4134
Jewel heist
Medium
4136
The Dragon and the knights
4154
Charlie the Cockchafer
Medium
4165
Heroes 2
4166
Gandhi and Dundee
4169
Plotter
4177
Estate
Easy
4190
Mop
Medium
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