Bicolored Segments

data structures, dp, graph matchings, sortings

Calendar Ambiguity

math, number theory

Segment Intersections

brute force, greedy, implementation, math

Good String

brute force, dp, greedy, two pointers

Array Walk

brute force, dp, greedy

LCM Problem

constructive algorithms, greedy, math, number theory

Uncle Bogdan and Projections

data structures, geometry, sortings

Captain Flint and Treasure

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

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

Captain Flint and a Long Voyage

greedy, math

Captain Flint and Crew Recruitment

brute force, greedy, math, number theory

Viruses

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

Village (Maximum)

*special problem, dfs and similar, trees

Village (Minimum)

*special problem, dp, greedy, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

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

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

Removing Leaves

data structures, greedy, implementation, trees

Directing Edges

constructive algorithms, dfs and similar, graphs

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Make It Good

greedy

Restore the Permutation by Merger

greedy

Three Pairwise Maximums

math

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Koa and the Beach (Easy Version)

brute force, dp, greedy

Common Prefixes

constructive algorithms, greedy, strings

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

GameGame

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

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Sequential Nim

dp, games

Common Subsequence

brute force

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

Unmerge

dp

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Circular Dungeon

greedy, math, probabilities

Strange Addition

data structures, dp, matrices

Merging Towers

data structures, dsu, implementation, trees

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Create The Teams

brute force, dp, greedy, implementation, sortings

Universal Solution

greedy

Three Indices

brute force, data structures

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

New Passenger Trams

binary search, brute force, data structures, sortings, two pointers

Choosing flowers

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

Dubious Cyrpto

binary search, brute force, math, number theory

Acacius and String

brute force, implementation, strings

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

Replace by MEX

brute force, constructive algorithms, sortings

Element Extermination

constructive algorithms, data structures, greedy

Neighbor Grid

constructive algorithms, greedy

Sign Flipping

constructive algorithms, math

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Reading Books (hard version)

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

Reading Books (easy version)

data structures, greedy, sortings

Zero Remainder Array

math, sortings, two pointers

Move Brackets

greedy, strings

Multiply by 2, divide by 6

math

Required Remainder

math

Pawns

data structures, divide and conquer, greedy

Network Coverage

binary search, constructive algorithms, data structures, greedy

Sum of Digits

brute force, constructive algorithms, dp, greedy

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Pluses and Minuses

math

01 Game

games

Donut Shops

greedy, implementation, math

Omkar and Modes

binary search, divide and conquer, interactive

Omkar and Last Floor

dp, greedy, two pointers

Omkar and Circle

brute force, dp, games, greedy

Omkar and Baseball

constructive algorithms, math

Omkar and Last Class of Math

greedy, math, number theory

Omkar and Completion

constructive algorithms, implementation

Raging Thunder

data structures, divide and conquer, implementation

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Asterism (Easy Version)

binary search, brute force, combinatorics, math, number theory, sortings

Grid-00100

constructive algorithms, greedy, implementation

A Cookie for You

greedy, implementation, math

Magical Calendar

math

Magical Sticks

math

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

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Number Game

games, math, number theory

GCD Compression

constructive algorithms, math, number theory

Maximum GCD

greedy, implementation, math, number theory

BareLee

dfs and similar, dp, games