Tree Cutting

bitmasks, dfs and similar, dp

Serval and Brain Power

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

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Score of a Tree

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

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Algebra Flash

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

Antifibonacci Cut

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

Kirill and Company

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

Keyboard Design

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

Cleaning Robot

bitmasks, dp

Zeros and Ones

bitmasks, divide and conquer, dp, math

Almost Sorted

bitmasks, data structures, dp

Illumination

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

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Xor-Subsequence (easy version)

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

Swap and Maximum Block

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

Lost Array

bitmasks, combinatorics, constructive algorithms, dp, math

XOR Triangle

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

Multiset of Strings

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

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Moving Chips

bitmasks, dp, greedy

Formalism for Formalism

bitmasks, dp, math

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Jee, You See?

bitmasks, combinatorics, dp

Getting Zero

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

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

Subsequences Galore

bitmasks, combinatorics, dp

Keep XOR Low

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

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

William The Oblivious

bitmasks, data structures, dp, matrices

RBS

binary search, bitmasks, brute force, data structures, dp

Bakry and Partitioning

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

Strange LCS

bitmasks, dp, graphs, greedy, strings

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Fix the String

*special problem, bitmasks, dp, greedy

Carrying Conundrum

bitmasks, combinatorics, dp, math

MAX-MEX Cut

bitmasks, constructive algorithms, dp, greedy

MIN-MEX Cut

bitmasks, constructive algorithms, dp, greedy

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Penalty

bitmasks, brute force, dp, greedy

Array Differentiation

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

Stringforces

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

Submatrices

*special problem, bitmasks, data structures, dp

Bingo

bitmasks, combinatorics, dp, math, probabilities

Favorite Game

bitmasks, dp

Love-Hate

bitmasks, brute force, dp, probabilities

Chests and Keys

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

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

Chips on a Board

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

Christmas Game

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

Genius

bitmasks, dp, graphs, number theory

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Max Correct Set

bitmasks, dp, math

Communism

bitmasks, dp, trees

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Yet Another DAG Problem

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

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Mercenaries

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

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Omkar and Pies

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

505

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

a-Good String

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

String Transformation 2

bitmasks, dp, graphs, trees

GameGame

bitmasks, constructive algorithms, dp, games, greedy, math

Spy-string

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

Make It Ascending

bitmasks, brute force, dp

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Letters and Question Marks

bitmasks, dp, string suffix structures

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Wise Men (Hard Version)

bitmasks, dp, math

Wise Men (Easy Version)

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

Reality Show

bitmasks, dp

Team Building

bitmasks, dp, greedy, sortings

Happy New Year

bitmasks, dp, implementation

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Around the World

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

Nora's Toy Boxes

bitmasks, combinatorics, dp

Minimax Problem

binary search, bitmasks, dp

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Sum Balance

bitmasks, dfs and similar, dp, graphs

Keyboard Purchase

bitmasks, dp

Yet Another Substring Reverse

bitmasks, dp

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Graph And Numbers

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

Marbles

bitmasks, dp

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

And Reachability

bitmasks, dp