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

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

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

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

Block unitary

*special problem

Chessboard unitary

*special problem

Anti-diagonal unitary

*special problem

Palindrome checker oracle

*special problem

OR 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

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

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

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

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

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

Lunar New Year and Food Ordering

data structures, implementation

Helping Hiasat

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

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Ayoub and Lost Array

combinatorics, dp, math

Radix sum

fft, math, number theory

Professional layer

bitmasks, dp

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Game with modulo

binary search, constructive algorithms, interactive

Grid game

constructive algorithms, implementation

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Monotonic Renumeration

combinatorics, sortings

Balanced Ternary String

greedy, strings

Array K-Coloring

greedy, sortings

(Zero XOR Subset)-less

math, matrices

Trucks and Cities

binary search, dp

Polycarp's New Job

implementation

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Division and Union

sortings

Ivan and Burgers

data structures, divide and conquer, greedy, math

Andrew and Taxi

binary search, dfs and similar, graphs

Dasha and Chess

constructive algorithms, games, interactive

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Ж-function

string suffix structures, strings

Fedya the Potter

binary search, implementation, math, number theory

Eels

data structures

Construct a tree

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

Nice table

brute force, constructive algorithms, greedy, math

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Vladislav and a Great Legend

combinatorics, dp, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

Egor and an RPG game

constructive algorithms, greedy

Makoto and a Blackboard

dp, math, number theory, probabilities

Yuhao and a Parenthesis

greedy, implementation