Isolation

data structures, dp

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Wrong Answer

constructive algorithms

Toy Train

brute force, greedy

Toy Train (Simplified)

brute force, greedy

System Testing

implementation

Mike and Children

brute force, implementation

Technogoblet of Fire

implementation, sortings

Secret Letters

data structures, dp, greedy

The very same Munchhausen

brute force

Power Tree

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

Compress String

dp, strings

Once in a casino

constructive algorithms, greedy, implementation, math

Diana and Liana

greedy, implementation, two pointers

Triple

fft, math

Get Ready for the Battle

constructive algorithms, implementation

Niyaz and Small Degrees

data structures, dp, trees

Pavel and Triangles

brute force, dp, fft, greedy, ternary search

Frets On Fire

binary search, sortings

Ramesses and Corner Inversion

constructive algorithms, greedy, implementation, math

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Ilya and a Colorful Walk

greedy, implementation

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Tree Cutting (Easy Version)

dfs and similar, trees

Yet Another Ball Problem

constructive algorithms, implementation

Coffee and Coursework (Hard Version)

binary search, greedy

Coffee and Coursework (Easy version)

brute force, greedy

Palindromic Matrix

constructive algorithms, implementation

Tanya and Candies

implementation

Water Buying

math

Recursive Queries

data structures

Crisp String

bitmasks, dp

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

Magic Gems

dp, math, matrices

Magic Ship

binary search

Emotes

greedy, math, sortings

Best Subsegment

implementation, math

Hessenberg matrix

*special problem

Creeper

*special problem

TIE fighter

*special problem

X-wing fighter

*special problem

Pattern of increasing blocks

*special problem

Block diagonal matrix

*special problem

``Is the number of ones divisible by 3?'' oracle

*special problem

``Is the bit string periodic?'' oracle

*special problem

Alternating bits oracle

*special problem

Not A, not B or not C?

*special problem

Distinguish three-qubit states

*special problem

Generate equal superposition of four basis states

*special problem

Generate state |00⟩ + |01⟩ + |10⟩

*special problem

Block unitary

*special problem

Chessboard unitary

*special problem

Anti-diagonal unitary

*special problem

Palindrome checker oracle

*special problem

OR oracle

*special problem

AND oracle

*special problem

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Arithmetic Progression

binary search, interactive, number theory, probabilities

Flood Fill

dp

Trailing Loves (or L'oeufs?)

brute force, implementation, math, number theory

Yet Another Array Partitioning Task

constructive algorithms, greedy, sortings

Got Any Grapes?

brute force, greedy, implementation

Sasha and Magnetic Machines

greedy, number theory

Sasha and His Trip

dp, greedy, math

Tree

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

Destroy the Colony

combinatorics, dp, math

Creative Snap

binary search, brute force, divide and conquer, math

Average Superhero Gang Power

brute force, implementation, math

Superhero Transformation

implementation, strings

Modest Substrings

dp, strings

Tree-Tac-Toe

constructive algorithms, games, trees

Nearest Leaf

data structures, trees

Magic Stones

constructive algorithms, math, sortings

Jongmah

dp

Meaningless Operations

constructive algorithms, math, number theory

Tape

greedy, sortings

Parity

math

Sasha and Algorithm of Silence's Sounds

data structures, trees

Sasha and a Very Easy Test

data structures, number theory

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Sasha and a Patient Friend

binary search, data structures, implementation

Sasha and One More Name

constructive algorithms, hashing, strings

Sasha and a Bit of Relax

dp, implementation

MST Unification

binary search, dsu, graphs, greedy

Array and Segments (Hard version)

data structures, implementation

Array and Segments (Easy version)

brute force, greedy, implementation

Diverse Garland

constructive algorithms, dp, greedy

Nice Garland

brute force, greedy, math

Divisors of Two Integers

brute force, greedy, math, number theory

Two distinct points

implementation

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Vasya and Binary String

dp

Compression

dp, implementation, math, number theory

Brutality

greedy, sortings, two pointers

Digital root

math, number theory

Digits Sequence Dividing

greedy, strings

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Lunar New Year and Red Envelopes

data structures, dp

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths