Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Seollal

graphs

New Year and Social Network

data structures, graph matchings, graphs, math, trees

New Year and Castle Construction

combinatorics, geometry, math, sortings

New Year and Conference

binary search, data structures, hashing, sortings

DIY Garland

constructive algorithms, greedy, trees

New Year Parties

dp, greedy

Christmas Trees

graphs, greedy, shortest paths

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Enchanted Artifact

constructive algorithms, interactive, strings

Petya and Exam

greedy, sortings, two pointers

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Kirchhoff's Current Loss

math

Miss Punyverse

dp, greedy, trees

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Beingawesomeism

implementation, math

Cut and Paste

implementation, math

New Year and Handle Change

binary search, dp

New Year Permutations

combinatorics, dp

Santa's Bot

combinatorics, math, probabilities

Cards

combinatorics, dp, math, number theory, probabilities

Tests for problem D

constructive algorithms, dfs and similar, divide and conquer, trees

Segment Tree

data structures, dsu, graphs, trees

Berry Jam

data structures, dp, greedy, implementation

Let's Play the Words?

data structures, hashing, implementation, math

Asterisk Substrings

string suffix structures

Four Stones

constructive algorithms

Tree Elimination

dp, trees

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Two Bracket Sequences

dp, strings, two pointers

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Divide The Students

brute force

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Xor on Figures

constructive algorithms, fft, math

Number of Components

data structures

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Awesome Substrings

math, strings

Divide Points

constructive algorithms, geometry, math

Strange Device

constructive algorithms, interactive, math, sortings

Happy Cactus

dp

Invertation in Tournament

brute force, divide and conquer, graphs, math

K Integers

binary search, data structures

Domino for Young

dp, greedy, math

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Lexicography

constructive algorithms, strings

Key Storage

combinatorics, math

Just Arrange the Icons

greedy, implementation, math

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Help BerLine

constructive algorithms

Game Relics

math, probabilities

Foolprüf Security

graphs

Elections

greedy

DevOps Best Practices

constructive algorithms

Cactus Revenge

constructive algorithms

Apprentice Learning Trajectory

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Permutation Concatenation

string suffix structures

Almost Same Distance

dfs and similar, graphs

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Fibonacci Problem

constructive algorithms, number theory

Beautiful League

constructive algorithms, flows, graph matchings

Beautiful Bracket Sequence (hard version)

combinatorics, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Beautiful Mirrors with queries

data structures, probabilities

Beautiful Sequence

brute force, constructive algorithms, greedy

Economic Difficulties

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

Editor

data structures, implementation

Xor-Set

bitmasks, divide and conquer, math

Colored Tree

data structures, trees

Tournament

brute force, dp, greedy

A Game with Traps

binary search, dp, greedy, sortings

Infinite Fence

greedy, math, number theory

Divisor Set

divide and conquer, fft, greedy, math, number theory

Make Them Similar

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

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Equalizing Two Strings

constructive algorithms, sortings, strings

Yet Another Division Into Teams

dp, greedy, sortings

Platforms Jumping

greedy

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Tree Queries

data structures, probabilities, trees

Point Ordering

constructive algorithms, geometry, interactive, math

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Send Boxes to Alice (Easy Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Feeding Chicken

constructive algorithms, greedy, implementation

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Antenna Coverage

data structures, dp, greedy, sortings

Harmonious Graph

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

Road Construction

flows, graphs

Addition Robot

data structures, math, matrices

Tiling Terrace

brute force, dp

Mission Possible

Twin Buildings

greedy, implementation

Performance Review

data structures

Regular Forestation

hashing, trees

Songwriter

greedy, two pointers