Subsequences (easy version)

dp, graphs, implementation, shortest paths

Flag

brute force, combinatorics, dp, implementation

Archaeology

brute force, constructive algorithms, greedy, strings

Destroy it!

dp, implementation, sortings

Array Splitting

greedy, sortings

Ehab and the Expected XOR Problem

bitmasks, constructive algorithms

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Good Triple

brute force, two pointers

Range Deleting

binary search, combinatorics, data structures, two pointers

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

Microtransactions (hard version)

binary search, greedy, implementation

Microtransactions (easy version)

binary search, greedy

Mysterious Code

dp, strings

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Power Transmission (Easy Edition)

brute force, geometry

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Maximum Balanced Circle

constructive algorithms, dp, greedy, two pointers

N Problems During K Days

constructive algorithms, greedy, math

Match Points

binary search, greedy, sortings, ternary search, two pointers

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Shovels Shop

dp, greedy, sortings

Serval and Rooted Tree

binary search, dfs and similar, dp, greedy, trees

Neko and Aki's Prank

dp, greedy, trees

Number of Components

combinatorics, data structures, dp, math

Thanos Nim

games

Chladni Figure

brute force, strings

Frog Jumping

dfs and similar, math, number theory

Median String

bitmasks, math, number theory, strings

Lynyrd Skynyrd

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

Privatization of Roads in Treeland

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

Same Sum Blocks (Hard)

data structures, greedy

Same Sum Blocks (Easy)

greedy

Spanning Tree with One Fixed Degree

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

Clear the String

dp

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Wrong Answer

constructive algorithms

Compress String

dp, strings

Diana and Liana

greedy, implementation, two pointers

Pavel and Triangles

brute force, dp, fft, greedy, ternary search

Magic Gems

dp, math, matrices

Magic Ship

binary search

Flood Fill

dp

MST Unification

binary search, dsu, graphs, greedy

Array and Segments (Hard version)

data structures, implementation

Lunar New Year and Red Envelopes

data structures, dp

Kilani and the Game

dfs and similar, graphs, implementation, shortest paths

Game with modulo

binary search, constructive algorithms, interactive

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

GCD Counting

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

Nice table

brute force, constructive algorithms, greedy, math

Make It Connected

dsu, graphs, greedy

Almost Regular Bracket Sequence

implementation

Tree with Maximum Cost

dfs and similar, dp, trees

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Berland University

greedy, math

Right Expansion Of The Mind

math

Minimal Product

LaTeX Expert

Fractions

math

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

The Fair Nut and Strings

greedy, strings

Increasing Frequency

binary search, dp, greedy

Missing Numbers

binary search, constructive algorithms, greedy, math, number theory

Olya and magical square

constructive algorithms, implementation, math

Pictures with Kittens (hard version)

data structures, dp

Pictures with Kittens (easy version)

dp

Vasya and a Tree

data structures, trees

Getting Deals Done

binary search, data structures

Cloud Computing

data structures, greedy

Array Without Local Maximums

dp

Yet another 2D Walking

dp

Dwarves, Hats and Extrasensory Abilities

binary search, constructive algorithms, geometry, interactive

TV Shows

data structures, greedy, implementation, sortings

Sergey and Subway

dfs and similar, dp, trees

Social Circles

greedy, math

Tanya and Colored Candies

*special problem, dp

Check Transcription

brute force, data structures, hashing, strings

Lucky Days

math, number theory

Changing Array

greedy, implementation

Optimal Polygon Perimeter

dp, geometry

Intersecting Subtrees

dfs and similar, interactive, trees

Train Hard, Win Easy

constructive algorithms, greedy, math, sortings

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Subway Pursuit

binary search, interactive, probabilities

Classy Numbers

combinatorics, dp

Divisors

interactive, math, number theory

The Unbearable Lightness of Weights

dp, math

Barcelonian Distance

geometry, implementation

Minimum path

greedy

Vasya and Good Sequences

bitmasks, dp

Multicolored Markers

binary search, brute force, math, number theory

Tree with Small Distances

dp, graphs, greedy

Concatenated Multiples

implementation, math

Order book

combinatorics, data structures, greedy

Inverse Coloring

combinatorics, dp, math

Recovering BST

brute force, dp, math, number theory, trees

Down or Right

constructive algorithms, interactive, matrices

The hat

binary search, interactive

The Wu

bitmasks, brute force, data structures

Stars Drawing (Hard Edition)

binary search, dp, greedy