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Problems

Geometry
Difficulty
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4387
Triathlon
Very easy
4389
Intersection of nonconvex polygons
Very hard
4390
The Life of Insects
4402
Math Lessons
Medium
4405
Multi-touch gesture classification
Very hard
4406
Stacking Curvy Blocks
4410
Hitting the Targets
4431
Combining Rectangles
Very easy
4471
Rectangles
4518
Division of Polygons
Easy
4537
Vasya and Tanks
Very easy
4551
All-Ukrainian coverage
Medium
4598
False figures
4600
Hidden triangles
Very easy
4602
Journey
Hard
4638
Theater
Easy
4661
Gold Mines
Very easy
4662
Chords
Hard
4685
Distance
4720
New Sergey's game
Very easy
4768
Let the goat into the garden 1`
Very easy
4769
Let the goat into the garden 7`
Very hard
4770
River
Hard
4771
Let the goat into the garden - 8`
Very hard
4772
Regular polygon
Hard
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