A Prime Flood (Hard Version)

brute force, combinatorics, combinatorics, combinatorics, dp, dp, number theory, number theory

A Prime Flood (Easy Version)

combinatorics, dp, number theory

Floor of MEX (Hard Version)

dp, implementation, math

Cyclic Balance

binary search, constructive algorithms, dp, math

Treasure Map Destruction (Counting Version)

dfs and similar, dp, dsu, graphs, math

Plus Minus Tree

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

Magic Tiles

dp, greedy, implementation

Beaver's Jumping Track (Hard Version)

data structures, dp, matrices

Beaver's Jumping Track (Easy Version)

data structures, dp, matrices

Busy Beaver

brute force, data structures, divide and conquer, dp, greedy, implementation, sortings

Nightcrawler

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

4-beauty

bitmasks, dp, graphs, math, number theory

Spectral Components

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

Generational Triplets

bitmasks, combinatorics, dp, math

No Balance Left

bitmasks, dp, math, number theory

Paths on a Grid

data structures, dp, hashing

Familiar?

brute force, combinatorics, dp

Yura and Deadlines

data structures, dp

Summer Vacation

data structures, data structures, data structures, dp, dp, probabilities, trees

Colorful Works

dp, fft, games, implementation

Hunting the Beast

combinatorics, dp, graphs, math

Cake Trial

dp, greedy

DBFS Order (Hard Version)

dp, trees

DBFS Order (Easy Version)

dp, trees

Paint the Array

data structures, dp, greedy

Elections in Saransk (hard version)

combinatorics, dp, dp, dp, math, number theory

Stripe, Token and Two Players

data structures, dp, games

Shortest GCD Paths

dp, graphs, math, number theory, shortest paths, shortest paths

Magical Tiered Cake

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

Graph Cutting

dfs and similar, dp, math, trees

Game on Growing Tree

binary search, dfs and similar, divide and conquer, dp, games, implementation, trees

The Endians

dp, trees

Wowee Binary String

combinatorics, dp, strings

Roadworks

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

Load Unbalancing

binary search, bitmasks, dp, greedy

Deconstruction Tree

combinatorics, data structures, dp, graphs, trees

Momoyo and the Network

binary search, dfs and similar, dfs and similar, divide and conquer, divide and conquer, dp, trees

Fallen Leaves

dfs and similar, dp, dp, trees, trees

Reserved Reversals

constructive algorithms, dp, greedy, math

Counting Sort?

brute force, combinatorics, dp

Coloring a Red Black Tree

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

Closer

dfs and similar, dp, trees

Down the Pivot

combinatorics, dp, math, trees

Interval Game

bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Learning Binary Search

combinatorics, divide and conquer, dp, math

Minimum Path Cover

brute force, dp, greedy, interactive, interactive, math, number theory, trees

A Simple GCD Problem (Hard Version)

dp, greedy, number theory

A Trivial String Problem

brute force, dp, hashing, string suffix structures, strings

Counting Cute Arrays

combinatorics, dp

Hanabi

binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy

Boxed Like a Fish

dfs and similar, dp, games, shortest paths, trees

Growth Factor

combinatorics, dp, math, number theory

Christmas Tree Un-decoration

data structures, dp, trees

Simons and Dividing the Rhythm

combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings

Grid Path

dp, dp, graphs, matrices

Binary Search with One Swap

binary search, divide and conquer, dp, hashing, math, two pointers

Rigged Bracket Sequence

combinatorics, dp, greedy

Operation Permutation

combinatorics, dp, math, probabilities

Sum of MEX

*special problem, combinatorics, data structures, dp, math

Fuzzy Concatenation (Hard version)

binary search, bitmasks, data structures, dp, greedy, string suffix structures

Double Bracket Sequence

data structures, dp, expression parsing, flows, greedy, strings

Interactive Graph (Hard Version)

combinatorics, dfs and similar, dp, graphs, interactive

Interactive Graph (Simple Version)

binary search, combinatorics, dfs and similar, dp, graphs, interactive

Idiot First Search and Queries

binary search, data structures, dp, graphs, trees

Parabola Independence

dp, graphs, greedy, math, sortings

Again Trees... (hard version)

bitmasks, data structures, dfs and similar, dp, fft, trees

Again Trees... (Easy Version)

bitmasks, dfs and similar, dp, trees

The Turtle Strikes Back

dp, graphs, greedy, implementation

Remove the Grail Tree

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

Fish Fight

dp, dp, math, probabilities, probabilities

Cost of Tree

dp, greedy, trees, trees

Xor Product

bitmasks, dp

Sub-RBS (Hard Version)

dp, games, implementation, strings

Zhora the Vacuum Cleaner

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

Little String (Hard Version)

combinatorics, dp, greedy, math, number theory

Little String (Easy Version)

combinatorics, dp, greedy, math, number theory

Al Fine (Counting Version)

dp, trees

Doors and Keys

brute force, data structures, dp

Cool Problem

bitmasks, dp, math

Shortest Statement Ever

bitmasks, constructive algorithms, dp, greedy

BattleCows 2

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

Cherry Tree

dfs and similar, dp, graphs, trees

Minimise Cost

binary search, dp, greedy, sortings

Jumping Man

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

LCM is Legendary Counting Master

dp, math, number theory

Short Garland

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

Christmas Reindeer (easy version)

bitmasks, brute force, combinatorics, dp, math

Jinx or Jackpot

brute force, dp, math, probabilities

Greta's Game

binary search, dp, graphs, greedy, math

Control Car (Hard Version)

combinatorics, dp, matrices, probabilities

Control Car (Easy Version)

combinatorics, dp, probabilities

No Effect XOR

bitmasks, divide and conquer, dp, greedy, math

Insolvable Disks

data structures, dp, greedy, math

XOR-factorization

bitmasks, constructive algorithms, dp, greedy, number theory

Blackslex and Plants

bitmasks, data structures, dp, implementation, math

Numbers or Fireworks

bitmasks, combinatorics, dp, graphs

deCH OR Dations

bitmasks, data structures, dp, hashing, probabilities

Omega Numbers

bitmasks, combinatorics, dp, math, number theory

Remove at the lowest cost

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