XOR-ranges

dp, greedy

Jumping Through the Array

binary search, data structures, graphs, two pointers

Range Diameter Sum

data structures, trees

Just Add an Edge

dfs and similar, dp, graphs

Holy Diver

data structures

Zigzag Game

games, interactive

Hopping Around the Array

data structures, dp

Communism

bitmasks, dp, trees

Bully Sort

data structures, math

JYPnation

graphs

Xor on Figures

constructive algorithms, fft, math

The Fair Nut's getting crazy

data structures, implementation

Forest Fires

math

Breadboard Capacity (hard version)

Ж-function

string suffix structures, strings

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Cheat and Win

bitmasks, data structures, games, trees

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Stock Exchange

binary search, flows, graphs

Old Mobile

combinatorics, dp, probabilities

Journey

data structures, divide and conquer, graphs, trees

Euler tour

constructive algorithms, trees

Flow Control

data structures, dsu, implementation

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Minecraft Series

brute force, two pointers

School Clubs

dp, fft, math, number theory, probabilities

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Growing flowers

data structures

Entangled Substrings

string suffix structures, strings

Epic Convolution

chinese remainder theorem, fft, math, number theory

Tree LGM

constructive algorithms, divide and conquer, games, trees

A Convex Game

dsu, games

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Cursor Distance

Omkar and Mosaic

combinatorics, constructive algorithms, math

Mateusz and Escape Room

dp

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Jellyfish and OEIS

dp

Blocks and Sensors

brute force

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

BubbleSquare Tokens

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

The Ultimate LIS Problem

data structures, greedy

Red Blue Tree

data structures, implementation, trees

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Olympic Team Building

brute force, meet-in-the-middle

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Dušan's Railway

divide and conquer, graphs, trees

Maximum Permutation

constructive algorithms

Boboniu and Banknote Collection

strings

Willy-nilly, Crack, Into Release!

data structures, dp

LuoTianyi and Cartridge

data structures, trees

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Balanced Distribution

data structures, dp, greedy

Clubstep

binary search, brute force, data structures, greedy, trees

Optimal Encoding

brute force, data structures

Strange Covering

divide and conquer

Mark and Spaceship

brute force, dp

Kuroni the Private Tutor

binary search, greedy

Two Sequences

data structures, hashing, string suffix structures

Tenzing and Necklace

divide and conquer, dp, greedy

Ela Takes Dancing Class

binary search, data structures

Copium Permutation

constructive algorithms, data structures, greedy

Slime and Sequences (Hard Version)

dp, fft, math

Cut the pie

binary search, data structures, geometry

Indefinite Clownfish

binary search, graphs

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Impressionism

constructive algorithms, graphs, implementation, math

Permutation Weight (Hard Version)

constructive algorithms, greedy

Two Avenues

data structures, dfs and similar, graphs

AquaMoon and Potatoes

brute force, data structures, dp

Panda Meetups

data structures, dp, flows

Tasty Dishes

math, matrices

Koxia, Mahiru and Winter Festival

constructive algorithms

Mio and Lucky Array

constructive algorithms, fft, math, strings

Palindromic Magic

data structures, hashing, strings

Centroid Guess

interactive, probabilities, trees

Neighbour Ordering

constructive algorithms, graphs

Covering Circle

geometry

Yin Yang

implementation

Rain Protection

binary search, geometry

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Pushing Robots

Assigning Fares

dp, trees

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Window Signals (hard version)

Tokitsukaze and Gems

dp, math

Rotary Laser Lock

binary search, interactive

Doremy's Swapping Trees

dfs and similar, graphs, trees

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Future Dominators

graphs, greedy

Slime and Hats

constructive algorithms, dp, greedy

Mainak and the Bleeding Polygon

binary search, geometry, implementation, math

AquaMoon and Time Stop (hard version)

data structures, dp