Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Prison Break

binary search, games, geometry, ternary search

One Billion Shades of Grey

flows, graphs

Boring Card Game

data structures, greedy, trees

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Impressive Harvesting of The Orchard

data structures

Captain of Knights

math

Blue and Red of Our Faculty!

divide and conquer, dp

BubbleSquare Tokens

Milutin's Plums

interactive

Light switches

meet-in-the-middle

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Lookup Tables

bitmasks

Virus

data structures, divide and conquer, dsu, graphs

Growing flowers

data structures

Coins

math

5G Antenna Towers

geometry

Does anyone else hate the wind?

Dušan's Railway

divide and conquer, graphs, trees

Wakanda Forever

Boring Queries

data structures, math, number theory

Minlexes

dp, greedy, implementation, strings

Swedish Heroes

brute force, dp, implementation

Battle Lemmings

dp, greedy

Rain of Fire

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

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Equal Product

data structures, math, number theory, two pointers

Expected Damage

binary search, combinatorics, probabilities

Showing Off

flows, graph matchings, greedy, implementation

Split

binary search, data structures, dp, greedy

Graph and Queries

data structures, dsu, graphs, implementation, trees

Cakes for Clones

dp

Roads and Ramen

data structures, trees

No Game No Life

bitmasks, games, math, matrices

The Thorny Path

greedy, math

Bitwise Magic

dp, math

Rainbow Triples

binary search, data structures, flows, greedy

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Deleting Numbers

interactive, math, number theory

Bricks

flows, graph matchings, graphs

Game of Pairs

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

Chess Rush

*special problem, combinatorics, dp, implementation, math

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Roads

*special problem, geometry, sortings

Reverse and Swap

binary search, bitmasks, data structures

Divide Square

data structures, geometry, implementation, sortings

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

x-prime Substrings

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

Running Competition

bitmasks, fft, math, number theory

Controversial Rounds

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

Distance Matching

constructive algorithms, dfs and similar, trees

Rainbow Rectangles

data structures, sortings, two pointers

Boboniu and Banknote Collection

strings

Boboniu and Jianghu

dp, greedy, sortings, trees

Boboniu and String

binary search, geometry, ternary search

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Kevin and Grid

fft, graphs, math

ZS Shuffles Cards

combinatorics, dp, math, probabilities

Omkar and Pies

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

Omkar and Landslide

binary search, constructive algorithms, data structures, greedy, math

Pairs of Pairs

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

Directing Edges

dfs and similar, dp, graphs, trees

Bicolored Segments

data structures, dp, graph matchings, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

Viruses

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

Village (Maximum)

*special problem, dfs and similar, trees

Joker

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

Mixture

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

Colors

*special problem, binary search, constructive algorithms, interactive

Special Edges

flows, graphs

Strange Operation

combinatorics, data structures, dp

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

String Transformation 2

bitmasks, dp, graphs, trees

Origami

geometry, math, sortings

The Majestic Brown Tree Snake

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

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Circular Dungeon

greedy, math, probabilities

Strange Addition

data structures, dp, matrices

Chess Strikes Back (hard version)

data structures, divide and conquer

Chess Strikes Back (easy version)

binary search, data structures

Inverse Genealogy

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

Cubic Lattice

geometry, math, matrices, number theory

Set Merging

constructive algorithms, divide and conquer

Tree Modification

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

Integer Game

constructive algorithms, games, interactive, math

Inversion SwapSort

constructive algorithms, greedy, sortings

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Pawns

data structures, divide and conquer, greedy

Network Coverage

binary search, constructive algorithms, data structures, greedy

Omkar and Modes

binary search, divide and conquer, interactive

Omkar and Last Floor

dp, greedy, two pointers

Raging Thunder

data structures, divide and conquer, implementation

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

BareLee

dfs and similar, dp, games