Array Sharpening

greedy, implementation

Even But Not Even

greedy, math, strings

Making Shapes

dp

Cartesian Tree

data structures

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Prefix Enlightenment

dfs and similar, dsu, graphs

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Mind Control

brute force, data structures, implementation

Red-Blue Graph

constructive algorithms, flows

Messenger Simulator

data structures

Minimax Problem

binary search, bitmasks, dp

Two Arrays

combinatorics, dp

Yet Another Meme Problem

math

Deadline

binary search, brute force, math, ternary search

Hyperset

brute force, data structures, implementation

Angry Students

greedy, implementation

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Fedya the Potter Strikes Back

data structures, strings

LCC

data structures, math, matrices, probabilities

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Madhouse (Easy version)

brute force, constructive algorithms, interactive, math

Numbers on Tree

constructive algorithms, data structures, dfs and similar, graphs, greedy, trees

Garland

dp, greedy, sortings

Classical?

binary search, combinatorics, number theory

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Dr. Evil Underscores

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

Fadi and LCM

brute force, math, number theory

Just Eat It!

dp, greedy, implementation

Mezo Playing Zoma

math

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

New Year and Permutation

combinatorics, math

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

New Year and Naming

implementation, strings

DIY Garland

constructive algorithms, greedy, trees

New Year Parties

dp, greedy

Christmas Trees

graphs, greedy, shortest paths

Friends and Gifts

constructive algorithms, data structures, math

Candies Division

math

Minutes Before the New Year

math

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

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Temporarily unavailable

implementation, math

Azamon Web Services

greedy

Suffix Three

implementation

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

Stack of Presents

data structures, implementation

Verse For Santa

binary search, brute force, implementation

New Year Garland

math

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

A and B

greedy, math

Shuffle Hashing

brute force, implementation, strings

Let's Play the Words?

data structures, hashing, implementation, math

Make Them Odd

greedy, number theory

Happy Birthday, Polycarp!

implementation

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

As Simple as One and Two

dp, greedy

Шардирование постов

*special problem, binary search, interactive

Контрольная сумма

*special problem

Контрольная сумма

*special problem

Контрольная сумма

*special problem

Storage2

*special problem

#define Задача B ...

*special problem

Code Review

*special problem

Скрытый друг

*special problem

Two Bracket Sequences

dp, strings, two pointers

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Remove One Element

brute force, dp

Yet Another Broken Keyboard

combinatorics, dp, implementation

Snow Walking Robot

constructive algorithms, greedy, implementation

Three Friends

brute force, greedy, math, sortings

Divide The Students

brute force

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Shawarma Tent

brute force, geometry, greedy, implementation

Blocks

greedy, math

Suits

brute force, greedy, math

Xor on Figures

constructive algorithms, fft, math

Number of Components

data structures

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math