Cactus Lady and her Cing

Cactus Meets Torus

Lisa's Sequences

dp

Game of Chance

math, probabilities

Antiparticle Antiphysics

Zig-zag

Counting Is Fun

combinatorics

Heroes of Might

math

Mind Bloom

dp

Crossing the Railways

data structures, dp

Fly Around the World

dp, geometry

Wakanda Forever

Fumo Temple

interactive

Parallel Swaps Sort

constructive algorithms, data structures

LIS?

data structures, greedy, implementation

Doremy's Average Tree

data structures, dp, greedy, trees

Three Minimums

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

Prison Break

binary search, games, geometry, ternary search

Redundant Routes

constructive algorithms, dp, trees

Goldberg Machine 3

dp, trees

Spiderweb Trees

dp, geometry, trees

AquaMoon and Time Stop (easy version)

data structures, dp

BinaryStringForces

constructive algorithms, data structures, dp

Min-Sum-Max

constructive algorithms, dp, greedy

Count Permutations

math

Anti-median (Hard Version)

combinatorics, dp, math

Jellyfish Nightmare

Jellyfish and Inscryption

dp

Game of AI (hard version)

combinatorics, fft, math

Ruler Of The Zoo

brute force, data structures

Long Recovery

constructive algorithms, dfs and similar

Standard Graph Problem

data structures, graphs, greedy, trees

AquaMoon and Time Stop (hard version)

data structures, dp

Koishi's Unconscious Permutation

fft, math

Four Stones

constructive algorithms

Farmer John's Favorite Intern

data structures, dp, flows, trees

Mainak and the Bleeding Polygon

binary search, geometry, implementation, math

Spinning Round (Hard Version)

divide and conquer, dp, trees

Future Dominators

graphs, greedy

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Slime and Hats

constructive algorithms, dp, greedy

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Window Signals (hard version)

378QAQ and Core

greedy, strings

Tokitsukaze and Gems

dp, math

Pushing Robots

Olympiad Training

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

Yin Yang

implementation

Assigning Fares

dp, trees

Covering Circle

geometry

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Minimum Hamming Distance

dp

Neighbour Ordering

constructive algorithms, graphs

Koxia, Mahiru and Winter Festival

constructive algorithms

Tasty Dishes

math, matrices

Palindromic Magic

data structures, hashing, strings

Mio and Lucky Array

constructive algorithms, fft, math, strings

Rotary Laser Lock

binary search, interactive

Panda Meetups

data structures, dp, flows

Centroid Guess

interactive, probabilities, trees

Permutation Weight (Hard Version)

constructive algorithms, greedy

Doremy's Swapping Trees

dfs and similar, graphs, trees

Impressionism

constructive algorithms, graphs, implementation, math

AquaMoon and Potatoes

brute force, data structures, dp

Two Avenues

data structures, dfs and similar, graphs

Slime and Sequences (Hard Version)

dp, fft, math

Arranging Crystal Balls

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

Ela Takes Dancing Class

binary search, data structures

Two Sequences

data structures, hashing, string suffix structures

Copium Permutation

constructive algorithms, data structures, greedy

Kuroni the Private Tutor

binary search, greedy

Cut the pie

binary search, data structures, geometry

Mark and Spaceship

brute force, dp

Tenzing and Necklace

divide and conquer, dp, greedy

Strange Covering

divide and conquer

Clubstep

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

Optimal Encoding

brute force, data structures

Balanced Distribution

data structures, dp, greedy

Indefinite Clownfish

binary search, graphs

LuoTianyi and Cartridge

data structures, trees

Willy-nilly, Crack, Into Release!

data structures, dp

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Maximum Permutation

constructive algorithms

Finding the Vertex

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

Olympic Team Building

brute force, meet-in-the-middle

Balance the Cards

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

Dušan's Railway

divide and conquer, graphs, trees

Rain Protection

binary search, geometry

Boboniu and Banknote Collection

strings

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

The Ultimate LIS Problem

data structures, greedy

Lost Nodes

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

Red Blue Tree

data structures, implementation, trees

Bugaboo

bitmasks, constructive algorithms, dp, number theory

BubbleSquare Tokens

Alphabetic Tree

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

Blocks and Sensors

brute force

Good Graph

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

Maximum Product?

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