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Problems

Combinatorics
Difficulty
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1534
Divisibility
Very easy
1535
Skyscrapers
Medium
1536
Sweet Child Makes Trouble
Very easy
1537
Stripe
Very easy
1538
Thinking Backward
Very easy
1539
How Many Points of Intersection?
1540
23 out of 5
Very easy
1585
Two Lottery Games
1781
Assignment problem
Very easy
1783
Lexicographically smallest cyclic shift
Very easy
1784
K-permutation
Very easy
1785
Patterns
1786
The Great Combinator
Very easy
1787
Chocolate bar
Hard
1788
Inverse permutation
Very easy
1789
Degree of a permutation
1790
Restore the permutation
1794
By arrangement!
Easy
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
1960
Cockroaches
Easy
1971
Fateful Chess Puzzle
Very easy
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