Wakanda Forever

Fly Around the World

dp, geometry

Strange Covering

divide and conquer

Prison Break

binary search, games, geometry, ternary search

Dušan's Railway

divide and conquer, graphs, trees

Spiderweb Trees

dp, geometry, trees

Ruler Of The Zoo

brute force, data structures

Rotary Laser Lock

binary search, interactive

Assigning Fares

dp, trees

Long Recovery

constructive algorithms, dfs and similar

BubbleSquare Tokens

Slime and Hats

constructive algorithms, dp, greedy

Four Stones

constructive algorithms

Jellyfish Nightmare

Cupboards Jumps

dp

Growing flowers

data structures

Boboniu and Banknote Collection

strings

Kuroni the Private Tutor

binary search, greedy

Blocks and Sensors

brute force

Mateusz and Escape Room

dp

Red Blue Tree

data structures, implementation, trees

Cubic Lattice

geometry, math, matrices, number theory

My Beautiful Madness

data structures, trees

Palindromic Magic

data structures, hashing, strings

Hopping Around the Array

data structures, dp

Balanced Distribution

data structures, dp, greedy

Balance the Cards

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

Finding the Vertex

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

Slime and Sequences (Hard Version)

dp, fft, math

Cursor Distance

Cheat and Win

bitmasks, data structures, games, trees

Ж-function

string suffix structures, strings

Rain Protection

binary search, geometry

Optimal Encoding

brute force, data structures

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

A Convex Game

dsu, games

School Clubs

dp, fft, math, number theory, probabilities

Stock Exchange

binary search, flows, graphs

Breadboard Capacity (hard version)

Cut the pie

binary search, data structures, geometry

Communism

bitmasks, dp, trees

Making Shapes

dp

Range Diameter Sum

data structures, trees

XOR-ranges

dp, greedy

Chip Game

games

Forest Fires

math

Holy Diver

data structures

Speckled Band

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

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Journey

data structures, divide and conquer, graphs, trees

Xor on Figures

constructive algorithms, fft, math

JYPnation

graphs

Zigzag Game

games, interactive

Epic Convolution

chinese remainder theorem, fft, math, number theory

Nora's Toy Boxes

bitmasks, combinatorics, dp

The Fair Nut's getting crazy

data structures, implementation

Euler tour

constructive algorithms, trees

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Modest Substrings

dp, strings

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Density of subarrays

dp, math

Beautiful Fibonacci Problem

constructive algorithms, number theory

Intervals of Intervals

binary search, data structures, two pointers

Beautiful fountains rows

data structures

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Cactus Revenge

constructive algorithms

Zero-XOR Array

*special problem, dp

Geolocation

geometry

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Differentiating Games

games, interactive

Bad Cryptography

math, number theory

Red-Blue Graph

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

Lada Malina

data structures, geometry

Pisces

data structures, flows, trees

Balls and Pockets

data structures

Tokitsukaze and Powers

number theory, probabilities

Long number

expression parsing, math, number theory

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Negative Time Summation

constructive algorithms

Strange device

binary search, interactive, math, trees

Harder Satisfiability

2-sat, dfs and similar, graphs

Beauty of a Permutation

constructive algorithms, math

Upside Down

data structures, string suffix structures, strings, trees

Shady Lady

geometry, math

Phoenix and Diamonds

binary search, data structures, sortings

Ember and Storm's Tree Game

combinatorics, dp, games, trees

So Mean

interactive, math

Don't Exceed

math, probabilities

Rap God

data structures, dfs and similar, hashing, strings, trees

Swiper, no swiping!

graphs, implementation

Passports

dp, implementation

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

Caramel Clouds

data structures, dp, sortings

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Mini Metro

dp

Happy Cactus

dp

Fedya the Potter

binary search, implementation, math, number theory

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Recover a functional graph

graph matchings