Problems
Bibble and Captain Snappy#4486
Very easy · Trees
Winnie-the-Pooh#4487
Easy · Trees
Winnie-the-Pooh 2#4488
Easy · Trees
Karlsson-on-the-Roof#4489
Very easy · Trees
Well, just you wait!#4490
Easy · Trees
Three from Creamville#4491
Very easy · Trees
Three from Prostokvashino 2#4492
Medium · Trees
Three from Prostokvashino 3#4493
Very easy · Trees
The Golden Key, or the Adventures of Buratino#4494
Very easy · Trees
Token Transfer#4495
Medium · Trees
Adventures of Dunno and His Friends#4496
Very easy · Trees · Segment Tree · Binary Search · Fenwick Tree
38 parrots#4497
Easy · Trees
The Return of the Wayward Parrot#4498
Medium · Trees
The Tale of the Priest and His Worker Balda#4499
Easy · Trees
Cipollino#4500
Easy · Trees
Bit Equation#4501
Easy · Bitmasks · Math
Summer Internship#4502
Very easy · Implementation · Math
Well, it's a very simple task.#4503
Very easy · Bitmasks · Implementation
AND & OR & max on a segment#4504
Medium · Segment Tree · Bitwise Operations · Range queries
Pyrotechnician#4505
Very easy · Bitmasks
Pyrotechnician - 2#4506
Very easy · Math · Bitmasks
Maximum XOR (Easy)#4507
Very easy · Bitmasks
Maximum XOR (Hard)#4508
Hard · Greedy algorithms · Bitwise Operations
Vasya and sets#4509
Very easy · Bitmasks · Implementation
AND & OR & min on a segment#4510
Very easy · Segment Tree · Binary Search