Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Vlad and an Odd Ordering

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

Increasing Subsequences

bitmasks, constructive algorithms, divide and conquer, greedy, math

Kim's Quest

bitmasks, combinatorics, dp

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

Look Back

bitmasks, greedy

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Data Structures Fan

binary search, bitmasks, data structures, dp

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Magic Will Save the World

binary search, bitmasks, brute force, dp

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Don't Blame Me

bitmasks, combinatorics, dp, math

The Very Beautiful Blanket

bitmasks, constructive algorithms

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Flexible String

bitmasks, brute force, strings

Interesting Sequence

bitmasks, math

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Orray

bitmasks, brute force, greedy, math, sortings

Sheikh (Easy version)

binary search, bitmasks, greedy, two pointers

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Even-Odd XOR

bitmasks, constructive algorithms, greedy

Maximum AND

bitmasks, dfs and similar, divide and conquer, greedy, sortings

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

388535 (Easy Version)

bitmasks, math

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Strange Test

binary search, bitmasks, brute force, dp, math

And Matching

bitmasks, constructive algorithms

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Fix the String

*special problem, bitmasks, dp, greedy

Carrying Conundrum

bitmasks, combinatorics, dp, math

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Take a Guess

bitmasks, constructive algorithms, interactive, math

Mikasa

binary search, bitmasks, greedy, implementation

Cobb

bitmasks, brute force, greedy, math

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Apollo versus Pan

bitmasks, brute force, math

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

a-Good String

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

AND, OR and square sum

bitmasks, greedy, math

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Edge Weight Assignment

bitmasks, constructive algorithms, dfs and similar, greedy, math, trees

Walk on Matrix

bitmasks, constructive algorithms, math

Dreamoon Likes Sequences

bitmasks, combinatorics, math

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

p-binary

bitmasks, brute force, math

The Number Of Good Substrings

binary search, bitmasks, brute force

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Tree Diameter

bitmasks, graphs, interactive

Bicolorings

bitmasks, dp

Subsequence Counting

bitmasks, constructive algorithms, greedy, implementation

Party Lemonade

bitmasks, dp, greedy

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Short Program

bitmasks, constructive algorithms

Qualification Rounds

bitmasks, brute force, constructive algorithms, dp

Sagheer, the Hausmeister

bitmasks, brute force, dp

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Vanya and Label

bitmasks, combinatorics, implementation, strings

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Kefa and Dishes

bitmasks, dp

Permutations

bitmasks, divide and conquer, math

Bits

bitmasks, constructive algorithms

Borya and Hanabi

bitmasks, brute force, implementation

The Child and Set

bitmasks, greedy, implementation, sortings

Network Mask

*special problem, bitmasks, brute force, implementation

Little Girl and Maximum XOR

bitmasks, dp, greedy, implementation, math

Undoubtedly Lucky Numbers

bitmasks, brute force, dfs and similar

The Brand New Function

bitmasks

Array

bitmasks, implementation, two pointers

PFAST Inc.

bitmasks, brute force, graphs