Fugitive Frenzy

math, probabilities

Evaluate It and Back Again

constructive algorithms, implementation, math

Cactus Transformation

constructive algorithms

Blueprint for Seating

combinatorics, divide and conquer, math

Two Colors

*special problem

Inverse Problem

*special problem, combinatorics, dp

Sum of Digits of Sums

*special problem, binary search, data structures

Pool Records

*special problem, greedy

Build Railway Stations

*special problem, greedy, trees

Maximum Sum Subarrays

*special problem, dp

Parallel Swaps Sort

constructive algorithms, data structures

Pumping Lemma

hashing, strings

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Multiple Lamps

bitmasks, brute force, constructive algorithms, math, number theory

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Palindromic Parentheses

constructive algorithms

Deck-Building Game

divide and conquer, math

Count BFS Graph

combinatorics, dp

Contingency Plan 2

graph matchings

Twin Friends

combinatorics, dp

Grid Game 2

games, number theory

Maximize The Value

data structures, sortings

Spaceship Exploration

binary search, geometry

Cursed Game

interactive

Button Pressing

bitmasks, constructive algorithms, hashing

Field Should Not Be Empty

brute force, data structures, divide and conquer

One-X

combinatorics, dfs and similar, dp, math, trees

Cyclic MEX

data structures, implementation, math, two pointers

Beautiful Tree

data structures, dfs and similar, graphs, implementation, trees

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

Babysitting

2-sat, binary search, data structures, graphs, trees

Geo Game

greedy, interactive, math

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Landscaping

binary search, geometry, two pointers

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Local Deletions

binary search, data structures, implementation

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Small GCD

bitmasks, brute force, dp, math, number theory

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Bracket Xoring

constructive algorithms, greedy, implementation, math

Permutation Sorting

data structures, sortings

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Fancy Arrays

combinatorics, dp, math, matrices

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Colorful Constructive

constructive algorithms, data structures, greedy

Freedom of Choice

brute force, greedy, implementation

A Growing Tree

data structures, dfs and similar, trees

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Game of Stacks

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

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Minimum Segments

constructive algorithms

Good Colorings

binary search, constructive algorithms, graphs, interactive

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Diamond Theft

data structures, greedy

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Monocarp and the Set

combinatorics, data structures, math

Hard Design

greedy, implementation, math

Counting Rhyme

dp, math, number theory

Two Permutations (Hard Version)

constructive algorithms

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Anya and the Mysterious String

binary search, data structures

Last Man Standing

brute force, data structures, number theory

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Clubstep

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

Indefinite Clownfish

binary search, graphs

Ball-Stackable

constructive algorithms, data structures, dp, trees

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Autosynthesis

constructive algorithms, dfs and similar, graphs, greedy, sortings

Jellyfish and Inscryption

dp

Jellyfish and OEIS

dp

Jellyfish and Hack

dp, math

Jellyfish and Miku

divide and conquer, dp, math, probabilities

Jellyfish and EVA

dp, graphs, greedy, math, probabilities

Jellyfish and Math

bitmasks, brute force, dfs and similar, dp, graphs, shortest paths

Replace With Product

brute force, greedy, math

Standard Graph Problem

data structures, graphs, greedy, trees

MEXanization

data structures

Lazy Numbers

binary search, math

Another MEX Problem

bitmasks, brute force, dp, shortest paths

LIS?

data structures, greedy, implementation

Min-Sum-Max

constructive algorithms, dp, greedy

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Travel Plan

combinatorics, dp, implementation, math, trees

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Most Different Tree

brute force, constructive algorithms, dfs and similar, greedy, hashing

Salyg1n and Array (hard version)

constructive algorithms, interactive

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities