Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Equal Product

data structures, math, number theory, two pointers

Cakes for Clones

dp

Roads and Ramen

data structures, trees

The Thorny Path

greedy, math

Bricks

flows, graph matchings, graphs

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Roads

*special problem, geometry, sortings

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Boboniu and Jianghu

dp, greedy, sortings, trees

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

ZS Shuffles Cards

combinatorics, dp, math, probabilities

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

Directing Edges

dfs and similar, dp, graphs, trees

Viruses

*special problem, dp, shortest paths, string suffix structures

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Mixture

*special problem, data structures, geometry, math, sortings

Strange Operation

combinatorics, data structures, dp

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Chess Strikes Back (hard version)

data structures, divide and conquer

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Omkar and Last Floor

dp, greedy, two pointers

Raging Thunder

data structures, divide and conquer, implementation

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

James and the Chase

dfs and similar, graphs, probabilities, trees

Johnny and James

greedy, implementation, math, trees

RC Kaboom Show

binary search, brute force, data structures, geometry, math

Pac-Man 2.0

*special problem, dp

Make It Ascending

bitmasks, brute force, dp

Nastya and Bees

graphs, interactive, probabilities

Substring Search

bitmasks, brute force, fft

Letters and Question Marks

bitmasks, dp, string suffix structures

Reality Show

bitmasks, dp

Treeland and Viruses

data structures, dfs and similar, dp, shortest paths, trees

Battalion Strength

data structures, divide and conquer, probabilities

Strange Function

dp

Au Pont Rouge

binary search, dp, strings

Number of Components

dsu, implementation

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Coffee Varieties (easy version)

graphs, interactive

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Red-Blue Graph

constructive algorithms, flows

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Classical?

binary search, combinatorics, number theory

Kirchhoff's Current Loss

math

New Year and Handle Change

binary search, dp

Tree Elimination

dp, trees

Game Relics

math, probabilities

DevOps Best Practices

constructive algorithms

Almost Same Distance

dfs and similar, graphs

Beautiful Bracket Sequence (hard version)

combinatorics, probabilities

Mission Possible

Find String in a Grid

data structures, dp, strings, trees

Conference Problem

dp

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Graph And Numbers

bitmasks, brute force, combinatorics, dp, meet-in-the-middle

Function Composition

dfs and similar

Alpha planetary system

constructive algorithms, graphs, shortest paths

Guarding warehouses

data structures, geometry

BubbleReactor

dp, graphs

Tiles Placement

constructive algorithms, dfs and similar, trees

Unusual Graph

*special problem, graphs

Polygons

greedy, math, number theory

Knightmare (hard)

graphs, interactive, shortest paths

Knightmare (easy)

graphs, interactive, shortest paths

GCD Groups 2

greedy, number theory, probabilities

A Story of One Country (Hard)

brute force, greedy, sortings

The Awesomest Vertex

data structures, dfs and similar

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

Nauuo and Portals

constructive algorithms

Anagram Paths

dp, implementation, trees

Indecisive Taxi Fee

data structures, graphs, shortest paths

Delivery Oligopoly

brute force, dp, graphs

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Abandoning Roads

brute force, dp, graphs, greedy

Rainbow Coins

interactive

Satanic Panic

dp, geometry

Foreigner

dp

Isolation

data structures, dp

Sasha and a Patient Friend

binary search, data structures, implementation

Eels

data structures

Vladislav and a Great Legend

combinatorics, dp, trees

Linearization

graphs

Ehab and a weird weight formula

data structures, trees

Beautiful Matrix

combinatorics, data structures, dp

Max Mex

data structures, trees

Speed Dial

dp, strings, trees

Array Game

data structures, games

Algoland and Berland

constructive algorithms, divide and conquer, geometry

Random Forest Rank

dp, graph matchings, math, trees

Lasers and Mirrors

constructive algorithms, math

Upgrading Cities

dfs and similar, graphs

Shrinking Tree

combinatorics, dp

Take Metro

brute force, data structures, graphs

Tree and XOR

strings, trees

Distinctification

data structures, dsu, greedy

You Are Given a Tree

data structures, dp, trees