Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Sum Balance

bitmasks, dfs and similar, dp, graphs

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

Reverse and Swap

binary search, bitmasks, data structures

Bored Bakry

bitmasks, greedy, math, two pointers

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

William The Oblivious

bitmasks, data structures, dp, matrices

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Make Them Similar

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

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Love-Hate

bitmasks, brute force, dp, probabilities

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

Jzzhu and Numbers

bitmasks, combinatorics, dp

Polycarpus is Looking for Good Substrings

bitmasks, hashing, implementation

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Axis Walking

bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle

Three Chairs

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

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Poman Numbers

bitmasks, greedy, math, strings

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Multidimensional Queries

bitmasks, data structures

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Mark and Professor Koro

binary search, bitmasks, brute force, combinatorics, data structures, greedy

Another MEX Problem

bitmasks, brute force, dp, shortest paths

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Segment Sum

bitmasks, combinatorics, dp, math

388535 (Hard Version)

bitmasks, brute force, data structures, math

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Devu and Flowers

bitmasks, combinatorics, number theory

Team Building

bitmasks, dp, greedy, sortings

Xor-MST

bitmasks, constructive algorithms, data structures

Clear The Matrix

bitmasks, dp

Nuclear Fusion

bitmasks, dp

The Minimum Number of Variables

bitmasks, dp

Bear and Floodlight

bitmasks, dp, geometry

Huge Strings

bitmasks, brute force, dp, implementation, strings

Snake

bitmasks, dfs and similar, graphs, implementation

Captains Mode

bitmasks, dp, games

Felicity's Big Secret Revealed

bitmasks, dp

Sereja and Table

bitmasks, greedy

Arpa and a game with Mojtaba

bitmasks, dp, games

Kirill and Company

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

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Vladik and cards

binary search, bitmasks, brute force, dp

Vlad and Avoiding X

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

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Helping Hiasat

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

Salazar Slytherin's Locket

bitmasks, dp

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Math Test

bitmasks, brute force, greedy

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

Another Sith Tournament

bitmasks, dp, math, probabilities

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Addition on Segments

bitmasks, data structures, divide and conquer, dp

And Reachability

bitmasks, dp

Yet Another Substring Reverse

bitmasks, dp

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Keyboard Purchase

bitmasks, dp

Marbles

bitmasks, dp

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Earn or Unlock

bitmasks, brute force, dp

Sausage Maximization

bitmasks, data structures, trees

Powerful Ksenia

bitmasks, constructive algorithms, math

A Simple Task

bitmasks, dp, graphs

Compatible Numbers

bitmasks, brute force, dfs and similar, dp

Tree Requests

binary search, bitmasks, constructive algorithms, dfs and similar, graphs, trees

Xenia and Dominoes

bitmasks, dfs and similar, dp

Inna and Binary Logic

binary search, bitmasks, data structures

Field Photography

bitmasks, data structures, sortings

Petya and Spiders

bitmasks, dp, dsu

Careful Maneuvering

bitmasks, brute force, geometry

Two Pizzas

bitmasks, brute force

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Random Task

binary search, bitmasks, combinatorics, dp, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Sheikh (Hard Version)

binary search, bitmasks, brute force, greedy, implementation, two pointers

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Game of Stones

bitmasks, dp, games

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy