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Problems
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Problems

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Difficulty
Sort by
626
Hard Test
Hard
639
Irrational pairwise distances
Easy
786
GrayInc
Hard
1009
2D-Nim
Medium
1133
Segment and Squares
Easy
1442
One-dimensional Clickomania
Medium
1827
Locks and keys
Very hard
2150
Triomino
Hard
2170
Repair in Hanoi
Very easy
2176
Trees Made to Order
Hard
2265
Horrible Truth
Hard
2361
Yami
Medium
2367
Restoration of permutation
Very hard
2374
Electrification
Medium
2427
Martingale sequence
Hard
2429
Minimum permutation
Very easy
2633
Cookies
Very hard
2636
Lambda-plant
Medium
2675
The Agency
Hard
2855
Knife to me
Hard
2869
Lame King High
Very hard
2880
Different Pairwise Sums
Hard
2963
Antitest
Medium
3081
Road Signs
Hard
3106
Laser Tag
Very hard
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