Bugaboo

bitmasks, constructive algorithms, dp, number theory

Communism

bitmasks, dp, trees

Nora's Toy Boxes

bitmasks, combinatorics, dp

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Hex Dyslexia

bitmasks, brute force, dp, graphs

Code Lock

bitmasks, dp

Favorite Game

bitmasks, dp

Tree Cutting

bitmasks, dfs and similar, dp

Chests and Keys

bitmasks, brute force, dfs and similar, dp, flows

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Wise Men (Hard Version)

bitmasks, dp, math

Little C Loves 3 III

bitmasks, dp, math

Professional layer

bitmasks, dp

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Max Correct Set

bitmasks, dp, math

String Transformation 2

bitmasks, dp, graphs, trees

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Boolean Function

bitmasks, dp, expression parsing

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Quick Tortoise

bitmasks, divide and conquer, dp

Make It Ascending

bitmasks, brute force, dp

Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Sherlock and the Encrypted Data

bitmasks, combinatorics, dp

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

Lost Array

bitmasks, combinatorics, constructive algorithms, dp, math

Graph And Numbers

bitmasks, brute force, combinatorics, dp, meet-in-the-middle

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Letters and Question Marks

bitmasks, dp, string suffix structures

Two Subsequences

bitmasks, dp

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Reality Show

bitmasks, dp

Password

bitmasks, dp, shortest paths

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Mutation

bitmasks, dp, math

Almost Sorted

bitmasks, data structures, dp

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers

Erasing Substrings

bitmasks, dp, greedy

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Varying Kibibits

bitmasks, dp

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Brand New Problem

bitmasks, brute force, dp

Formalism for Formalism

bitmasks, dp, math

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Sandy and Nuts

bitmasks, dp, trees

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Bingo

bitmasks, combinatorics, dp, math, probabilities

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Strange LCS

bitmasks, dp, graphs, greedy, strings

Game with Strings

bitmasks, dp, probabilities

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Divide, XOR, and Conquer

bitmasks, dp, math

XOR Counting

bitmasks, combinatorics, dp, math

PolandBall and Gifts

bitmasks, dp, greedy

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Guards In The Storehouse

bitmasks, dp

Garden

bitmasks, dp, graphs, trees

Crisp String

bitmasks, dp

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

Zeros and Ones

bitmasks, divide and conquer, dp, math

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Construct Tree

bitmasks, constructive algorithms, dp, trees

Dead Ends

bitmasks, dp

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Happy New Year

bitmasks, dp, implementation

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math

Remembering Strings

bitmasks, dp

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Genius

bitmasks, dp, graphs, number theory

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Arrangement

bitmasks, dp

Simplified Nonogram

bitmasks, dp, hashing, meet-in-the-middle

Game with Strings

bitmasks, dp, games

Valera and Number

bitmasks, dp, math, probabilities

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Logical Expression

bitmasks, dp, shortest paths

Subsequences Galore

bitmasks, combinatorics, dp

Jee, You See?

bitmasks, combinatorics, dp

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Hongcow Buys a Deck of Cards

bitmasks, brute force, dp

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Jellyfish and Math

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

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Cleaning Robot

bitmasks, dp

Party

bitmasks, brute force, dp, graphs