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Problems

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Difficulty
Sort by
1795
Smooth numbers
Medium
1858
Rhyme scheme
Medium
1866
Cute patterns 2
Medium
1869
Paths on the board
Very easy
1902
A very friendly group
Easy
1909
Drawing
Medium
1960
Cockroaches
Easy
1971
Fateful Chess Puzzle
Very easy
1984
Fractions
Easy
2005
Weighing 2
Very hard
2015
Game XOR
Hard
2053
Girls' Celebration
Very hard
2058
Rujia Liu loves Wario Land!
Very hard
2169
Permutations
Easy
2176
Trees Made to Order
Hard
2226
Zoo
Easy
2227
Necklace of Beads
Hard
2260
Commuting Functions
Very easy
2288
Mining Your Own Business
Very hard
2293
March 8
Very easy
2352
Little Bishops
Very easy
2362
Who is longer?
Very easy
2367
Restoration of permutation
Very hard
2370
Automated Telephone Exchange
Very easy
2387
Permutation by number
Easy
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