Cactus Lady and her Cing

Permutation Weight (Hard Version)

constructive algorithms, greedy

The Ultimate LIS Problem

data structures, greedy

Game of Chance

math, probabilities

Heroes of Might

math

Neighbour Ordering

constructive algorithms, graphs

AquaMoon and Potatoes

brute force, data structures, dp

Yin Yang

implementation

Two Avenues

data structures, dfs and similar, graphs

Three Minimums

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

Dušan's Railway

divide and conquer, graphs, trees

AquaMoon and Time Stop (hard version)

data structures, dp

AquaMoon and Time Stop (easy version)

data structures, dp

Fly Around the World

dp, geometry

Prison Break

binary search, games, geometry, ternary search

Wakanda Forever

Long Recovery

constructive algorithms, dfs and similar

Covering Circle

geometry

Spiderweb Trees

dp, geometry, trees

Ruler Of The Zoo

brute force, data structures

Assigning Fares

dp, trees

Tasty Dishes

math, matrices

Strange Covering

divide and conquer

Tokitsukaze and Gems

dp, math

Jellyfish Nightmare

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Four Stones

constructive algorithms

Rotary Laser Lock

binary search, interactive

Cubic Lattice

geometry, math, matrices, number theory

Slime and Hats

constructive algorithms, dp, greedy

Kuroni the Private Tutor

binary search, greedy

BubbleSquare Tokens

Palindromic Magic

data structures, hashing, strings

Pushing Robots

Two Sequences

data structures, hashing, string suffix structures

Boboniu and Banknote Collection

strings

Balanced Distribution

data structures, dp, greedy

Slime and Sequences (Hard Version)

dp, fft, math

Omkar and Mosaic

combinatorics, constructive algorithms, math

Rain Protection

binary search, geometry

Finding the Vertex

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

Optimal Encoding

brute force, data structures

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Cut the pie

binary search, data structures, geometry

A Convex Game

dsu, games

Balance the Cards

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

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Alphabetic Tree

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

Mateusz and Escape Room

dp

Cursor Distance

School Clubs

dp, fft, math, number theory, probabilities

Cheat and Win

bitmasks, data structures, games, trees

Blocks and Sensors

brute force

Red Blue Tree

data structures, implementation, trees

My Beautiful Madness

data structures, trees

Stock Exchange

binary search, flows, graphs

Jumping Through the Array

binary search, data structures, graphs, two pointers

Ж-function

string suffix structures, strings

Growing flowers

data structures

Lost Nodes

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

Hopping Around the Array

data structures, dp

Range Diameter Sum

data structures, trees

Breadboard Capacity (hard version)

XOR-ranges

dp, greedy

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Speckled Band

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

Journey

data structures, divide and conquer, graphs, trees

Cupboards Jumps

dp

Epic Convolution

chinese remainder theorem, fft, math, number theory

Just Add an Edge

dfs and similar, dp, graphs

JYPnation

graphs

Holy Diver

data structures

Forest Fires

math

Phoenix and Bits

bitmasks, brute force, data structures, sortings

The Fair Nut's getting crazy

data structures, implementation

Communism

bitmasks, dp, trees

Minimize Inversions Number

data structures, greedy, math, sortings

Nora's Toy Boxes

bitmasks, combinatorics, dp

Euler tour

constructive algorithms, trees

Xor on Figures

constructive algorithms, fft, math

Zigzag Game

games, interactive

Making Shapes

dp

Chip Game

games

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Modest Substrings

dp, strings

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Density of subarrays

dp, math

Intervals of Intervals

binary search, data structures, two pointers

Beautiful fountains rows

data structures

Beautiful Fibonacci Problem

constructive algorithms, number theory

Cactus Revenge

constructive algorithms

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Zero-XOR Array

*special problem, dp

Geolocation

geometry

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Bad Cryptography

math, number theory

Lada Malina

data structures, geometry

Differentiating Games

games, interactive

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle