Lisa's Sequences

dp

Cactus Lady and her Cing

Cactus Meets Torus

Game of Chance

math, probabilities

Window Signals (hard version)

Heroes of Might

math

Anti-median (Hard Version)

combinatorics, dp, math

BinaryStringForces

constructive algorithms, data structures, dp

AquaMoon and Potatoes

brute force, data structures, dp

Fly Around the World

dp, geometry

Prison Break

binary search, games, geometry, ternary search

Koxia, Mahiru and Winter Festival

constructive algorithms

Two Avenues

data structures, dfs and similar, graphs

Game of AI (hard version)

combinatorics, fft, math

Wakanda Forever

Arranging Crystal Balls

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

Koishi's Unconscious Permutation

fft, math

Dušan's Railway

divide and conquer, graphs, trees

AquaMoon and Time Stop (easy version)

data structures, dp

Mainak and the Bleeding Polygon

binary search, geometry, implementation, math

Yin Yang

implementation

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Spiderweb Trees

dp, geometry, trees

Strange Covering

divide and conquer

Ruler Of The Zoo

brute force, data structures

Tasty Dishes

math, matrices

Neighbour Ordering

constructive algorithms, graphs

Four Stones

constructive algorithms

Jellyfish Nightmare

Covering Circle

geometry

Cubic Lattice

geometry, math, matrices, number theory

AquaMoon and Time Stop (hard version)

data structures, dp

Long Recovery

constructive algorithms, dfs and similar

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Slime and Hats

constructive algorithms, dp, greedy

Olympiad Training

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

Rotary Laser Lock

binary search, interactive

Assigning Fares

dp, trees

Mio and Lucky Array

constructive algorithms, fft, math, strings

Kuroni the Private Tutor

binary search, greedy

Centroid Guess

interactive, probabilities, trees

Tokitsukaze and Gems

dp, math

Impressionism

constructive algorithms, graphs, implementation, math

BubbleSquare Tokens

Ela Takes Dancing Class

binary search, data structures

Permutation Weight (Hard Version)

constructive algorithms, greedy

Balanced Distribution

data structures, dp, greedy

Pushing Robots

Two Sequences

data structures, hashing, string suffix structures

Rain Protection

binary search, geometry

Optimal Encoding

brute force, data structures

Boboniu and Banknote Collection

strings

Slime and Sequences (Hard Version)

dp, fft, math

Palindromic Magic

data structures, hashing, strings

Maximum Product?

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

The Ultimate LIS Problem

data structures, greedy

Cut the pie

binary search, data structures, geometry

Finding the Vertex

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

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Olympic Team Building

brute force, meet-in-the-middle

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Omkar and Mosaic

combinatorics, constructive algorithms, math

A Convex Game

dsu, games

Maximum Permutation

constructive algorithms

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Balance the Cards

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

Cursor Distance

Alphabetic Tree

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

Blocks and Sensors

brute force

Red Blue Tree

data structures, implementation, trees

Cheat and Win

bitmasks, data structures, games, trees

Growing flowers

data structures

Mateusz and Escape Room

dp

Lost Nodes

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

School Clubs

dp, fft, math, number theory, probabilities

Ж-function

string suffix structures, strings

Stock Exchange

binary search, flows, graphs

Minecraft Series

brute force, two pointers

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Breadboard Capacity (hard version)

Hopping Around the Array

data structures, dp

XOR-ranges

dp, greedy

Journey

data structures, divide and conquer, graphs, trees

Epic Convolution

chinese remainder theorem, fft, math, number theory

Cupboards Jumps

dp

Speckled Band

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

Holy Diver

data structures

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Euler tour

constructive algorithms, trees

JYPnation

graphs

Range Diameter Sum

data structures, trees

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Forest Fires

math

Jumping Through the Array

binary search, data structures, graphs, two pointers

The Fair Nut's getting crazy

data structures, implementation

Communism

bitmasks, dp, trees

Just Add an Edge

dfs and similar, dp, graphs

Zigzag Game

games, interactive

Xor on Figures

constructive algorithms, fft, math

Nora's Toy Boxes

bitmasks, combinatorics, dp