Problems
Even and odd numbers#1623
Very easy · For Beginners
Day after tomorrow#1624
Easy · Implementation
Judging Olympia#1625
Easy · Implementation · Math
Hide That Number#1626
Very easy · Trees
Rotating Rings#1627
Medium · Implementation · Strings · Two pointers
A Tale from the Dark Side of the Moon#1628
Easy · Implementation
Fermat's Christmas Theorem#1629
Very easy · Number theory
Random Points#1630
Very easy · Geometry · Sorting
Let's Go to the Movies#1631
Hard · Dynamic programming · Trees · Graphs · Greedy algorithms
The Writers' Club#1632
Easy · Graphs · Implementation · Data Structures
Moving Sticks#1633
Very hard · Implementation
Johnny Hates Math#1634
Easy · Dynamic programming · Implementation
Hologram Advertisements#1635
Very easy · Geometry
Big Number#1636
Very hard · Number theory
Distance#1638
Easy · Graphs
Golden Spire#1641
Easy · Geometry
Hometask#1642
Easy · Number theory · Math
Joke#1644
Medium · Implementation
Binary number#1645
Easy · Bitmasks · Bitwise Operations
Reset bits#1647
Easy · Bitmasks · Implementation
Fenwick Function#1648
Easy · Bitmasks · Bitwise Operations
Bit sorting#1649
Hard · Sorting
Decoding Task#1650
Very easy · Implementation · Bitmasks
Maximal XOR#1651
Very easy · Bitwise Operations
Polynomial#1652
Easy · Strings