Alya and Permutation

bitmasks, constructive algorithms, math

Bitwise Balancing

bitmasks, hashing, implementation, math, schedules, ternary search

Increasing Sequence with Fixed OR

bitmasks, constructive algorithms, greedy

Turtle and an Infinite Sequence

bitmasks, math

Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Vlad and Division

bitmasks, greedy

XOR-distance

bitmasks, greedy, implementation, math

Game with Multiset

binary search, bitmasks, brute force, greedy

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Iva & Pav

binary search, bitmasks, data structures, greedy

Jellyfish and Green Apple

bitmasks, greedy, math, number theory

Data Structures Fan

binary search, bitmasks, data structures, dp

Divisor Chain

bitmasks, constructive algorithms, math, number theory

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Gardener and the Array

bitmasks, constructive algorithms

Orray

bitmasks, brute force, greedy, math, sortings

Even-Odd XOR

bitmasks, constructive algorithms, greedy

Maximal AND

bitmasks, greedy, math

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths

Bit Flipping

bitmasks, constructive algorithms, greedy, strings

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Fortune Telling

bitmasks, math

And Matching

bitmasks, constructive algorithms

And It's Non-Zero

bitmasks, greedy, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Array Elimination

bitmasks, greedy, math, number theory

Robot Factory

bitmasks, dfs and similar

Co-growing Sequence

bitmasks, constructive algorithms, greedy

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Box Fitting

binary search, bitmasks, data structures, greedy

Berland Crossword

bitmasks, brute force, greedy, implementation

Find The Array

bitmasks, constructive algorithms, greedy

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Johnny and Another Rating Drop

bitmasks, greedy, math

Adding Powers

bitmasks, greedy, implementation, math, number theory, ternary search

Make Good

bitmasks, constructive algorithms, math

Neko Performs Cat Furrier Transform

bitmasks, constructive algorithms, dfs and similar, math

Powers Of Two

bitmasks, greedy

Chessboard

bitmasks, brute force, implementation

New Year's Eve

bitmasks, constructive algorithms, number theory

Qualification Rounds

bitmasks, brute force, constructive algorithms, dp

Vanya and Label

bitmasks, combinatorics, implementation, strings

New Year and Old Property

bitmasks, brute force, implementation

Preparing Olympiad

bitmasks, brute force

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

The Child and Set

bitmasks, greedy, implementation, sortings

Array

bitmasks, implementation, two pointers

PFAST Inc.

bitmasks, brute force, graphs

Lucky Numbers (easy)

binary search, bitmasks, brute force

Tournament

bitmasks, brute force, dfs and similar, greedy