Bottle Arrangement

data structures, divide and conquer, dp, dsu, greedy

Sheet Music

combinatorics, dp, math

Cube

bitmasks, dfs and similar, dp

Shohag Loves Counting (Hard Version)

dp, number theory

Shohag Loves Counting (Easy Version)

brute force, combinatorics, dp, math, number theory

Shohag Loves Inversions

combinatorics, dp, implementation, math

Royal Flush

dp, implementation

Grid Walk

brute force, dp, greedy, math, number theory

Divide OR Conquer

binary search, bitmasks, data structures, dp, implementation

Natlan Exploring

bitmasks, combinatorics, data structures, dp, math, number theory

Go Learn! (Hard Version)

divide and conquer, dp

Go Learn! (Easy Version)

dp, trees

Tree Operations

binary search, brute force, dfs and similar, dp, trees

Sakurako and Chefir

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

Peanuts

combinatorics, dp, games, math

Penchick and Chloe's Trees

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

Orangutan Approved Subarrays

binary search, data structures, dp, greedy, implementation, two pointers

MEXimize the Score

combinatorics, data structures, dp, greedy, implementation, math

Message Spread

bitmasks, brute force, combinatorics, dp

Balanced Problem

data structures, dp

Alice's Adventures in Addition

bitmasks, brute force, dp, implementation

Alice's Adventures in the Rabbit Hole

combinatorics, dfs and similar, dp, games, greedy, math, probabilities, trees

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

Bit Game (Hard Version)

bitmasks, dp, math

The Endspeaker (Hard Version)

binary search, data structures, dp, greedy, implementation, two pointers

Bermart Ice Cream

data structures, dfs and similar, divide and conquer, dp, implementation, trees

Choose Your Queries

constructive algorithms, dfs and similar, dp, graphs, greedy, trees

Card Game

combinatorics, dp, fft, greedy, math

Tree of Life

dp, greedy, trees

Many Games

brute force, dp, greedy, math, probabilities

Asesino (Hard Version)

constructive algorithms, dp, interactive

Digital Village (Extreme Version)

data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Boss, Thirsty

dp, greedy, implementation

Count Leaves

dp, math, number theory

Expected Power

bitmasks, dp, math, probabilities

Speedbreaker Counting (Hard Version)

dp, greedy, math

Speedbreaker Counting (Medium Version)

dp, greedy, math

Speedbreaker Counting (Easy Version)

combinatorics, dp, greedy, math

Max Plus Min Plus Size

data structures, dp, dsu, greedy, implementation, matrices, sortings

Sheriff's Defense

dfs and similar, dp, greedy, trees

Game in Tree (Easy Version)

binary search, brute force, data structures, dp, games, greedy, implementation, trees

Prefix GCD

brute force, dp, greedy, math, number theory

Yunli's Subarray Queries (extreme version)

data structures, dp, implementation

Yunli's Subarray Queries (hard version)

binary search, data structures, dp

Subtangle Game (Hard Version)

data structures, dp, games, greedy, implementation

Subtangle Game (Easy Version)

dp, games, greedy, implementation

Substring Compression

data structures, dp, matrices

Turtle and Three Sequences

brute force, data structures, dp, greedy, math, probabilities, two pointers

Turtle and Inversions (Hard Version)

brute force, data structures, divide and conquer, dp, greedy, math, two pointers

Turtle and Inversions (Easy Version)

brute force, divide and conquer, dp, greedy, math

Turtle and a MEX Problem (Hard Version)

dfs and similar, dp, graphs, greedy, implementation, math

Court Blue (Hard Version)

brute force, dp, math, number theory

Court Blue (Easy Version)

brute force, dfs and similar, dp, math, number theory

Cosmic Rays

brute force, data structures, dp

Deterministic Heap (Hard Version)

combinatorics, dp, trees

Deterministic Heap (Easy Version)

combinatorics, dp, math, trees

Determine Winning Islands in Race

data structures, dp, graphs, greedy, shortest paths

Chips on a Line

brute force, combinatorics, dp, greedy, math

Let Me Teach You a Lesson (Hard Version)

data structures, dp, matrices, two pointers

Let Me Teach You a Lesson (Easy Version)

2-sat, data structures, dp, matrices, two pointers

Cases

bitmasks, brute force, dp, strings

Minecraft

bitmasks, brute force, dp, graphs, math

Xor-Grid Problem

bitmasks, constructive algorithms, dp, implementation

Med-imize

binary search, dp, greedy

Ultra-Meow

combinatorics, dp, math

Prime Split Game

bitmasks, dp, fft, games, math, number theory

Polygonal Segments

brute force, data structures, divide and conquer, dp, greedy, two pointers

Distance to Different

combinatorics, dp, math

Heartbeat

combinatorics, dp, fft, math

The Omnipotent Monster Killer

brute force, dfs and similar, dp, trees

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

Maximize the Largest Component (Hard Version)

data structures, dfs and similar, dp, dsu, implementation

Tower Capturing

combinatorics, dp, geometry

Reconstruction

brute force, dp, math

Shuffle

dp, greedy, trees

Your Loss

bitmasks, brute force, dp, trees

Number of k-good subarrays

bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle

Turtle and Paths on a Tree

data structures, dp, trees

Computing Machine

brute force, data structures, dp, greedy, implementation

Remove Bridges

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

Mind Bloom

dp

Set

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

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Min-Fund Prison (Medium)

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

Trails (Hard)

dp, matrices

Trails (Medium)

dp, matrices

Card Pairing

dp, greedy, hashing, implementation

Unique Array

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

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Composite Spells

*special problem, dp

Carousel of Combinations

brute force, combinatorics, dp, math, number theory