Simultaneous Coloring

dfs and similar, divide and conquer, graphs

Heartbeat

combinatorics, dp, fft, math

Fumo Temple

interactive

Spinning Round (Hard Version)

divide and conquer, dp, trees

Spinning Round (Easy Version)

divide and conquer, dp, trees

Interesting Problem (Hard Version)

dp

Interesting Problem (Easy Version)

dp

Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Tower Capturing

combinatorics, dp, geometry

Magic Trick II

constructive algorithms, implementation, sortings

Reconstruction

brute force, dp, math

Shuffle

dp, greedy, trees

Your Loss

bitmasks, brute force, dp, trees

array-value

binary search, bitmasks, data structures, greedy, two pointers

Sorting Problem Again

binary search, data structures, sortings

Turtle and Paths on a Tree

data structures, dp, trees

Turtle and Intersected Segments

data structures, dsu, graphs, greedy

Turtle and Multiplication

constructive algorithms, dfs and similar, graphs, number theory

Field Division (hard version)

math, sortings

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Tensor

constructive algorithms, graphs, interactive

Remove Bridges

data structures, dfs and similar, dp, greedy, sortings, trees

Splittable Permutations

combinatorics, data structures, dfs and similar, greedy, math, trees

Mind Bloom

dp

378QAQ and Core

greedy, strings

Zimpha Fan Club

fft, greedy, math, strings

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Cat, Fox and Swaps

graphs, math, sortings

Cat, Fox and Maximum Array Split

brute force, interactive, math

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Arithmancy (Hard)

interactive

Arithmancy (Medium)

constructive algorithms, interactive, probabilities, strings

Balanced Unshuffle (Hard)

constructive algorithms, trees

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Card Pairing

dp, greedy, hashing, implementation

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Next and Prev

brute force, data structures, implementation

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Conference

data structures, flows

Connected Cubes

constructive algorithms, games

Missing Subarray Sum

constructive algorithms

Necromancer

*special problem

Equal Trees

*special problem, graphs, meet-in-the-middle

Composite Spells

*special problem, dp

Observation Towers

*special problem

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Unique Strings

combinatorics, dp, math

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Thanos Snap

binary search, dp, games, greedy, trees

Clacking Balls

combinatorics, math, probabilities

Inversion Composition

constructive algorithms, data structures, greedy

Make Triangle

constructive algorithms, math

Amanda the Amoeba

graphs, implementation, trees, two pointers

Division Avoidance

greedy, math

Damage per Second

brute force, math

Funny or Scary?

constructive algorithms

Grove

brute force, dfs and similar, dp, geometry, probabilities

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Rare Coins

combinatorics, math, probabilities

Nobody is needed

2-sat, data structures, dfs and similar, dp

GCD is Greater

brute force, data structures, math, number theory

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Minimum Hamming Distance

dp

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

MEX Game 2 (Easy Version)

binary search, brute force, greedy

Counting Is Fun (Hard Version)

combinatorics, dp

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Farmer John's Favorite Intern

data structures, dp, flows, trees

Bessie and Cards

combinatorics, dp, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Zig-zag

XOR Operations

Tree Quiz

Symmetric Boundary

Forming Groups

Bánh Bò

Attraction Score

Antiparticle Antiphysics

Grand Finale: Circles

binary search, geometry

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Weird LCM Operations

brute force, constructive algorithms, number theory

XOR Break --- Game Version

bitmasks, games, greedy, interactive

Counting Is Fun

combinatorics

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Prefix Max Set Counting

data structures, dp, trees

Maximize the Difference

bitmasks, brute force, dfs and similar