GCD Groups 2

greedy, number theory, probabilities

Rectangle Painting 2

flows, graph matchings, graphs

Rectangle Painting 1

dp

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Welfare State

binary search, brute force, data structures, sortings

MP3

sortings, two pointers

Coloring Game

dp, games, matrices

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Yet Another Subarray Problem

dp, greedy, math

K-th Path

brute force, constructive algorithms, shortest paths, sortings

Connected Component on a Chessboard

constructive algorithms, implementation

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Geometers Anonymous Club

data structures, geometry, math, sortings

OpenStreetMap

data structures, two pointers

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Another Meme Problem

dp

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

1-2-K Game

games, math

Tokitsukaze and Powers

number theory, probabilities

Tokitsukaze and Explosion

binary search, greedy

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Tokitsukaze and Duel

brute force, games, greedy

Tokitsukaze, CSL and Stone Game

games

Problem from Red Panda

combinatorics

Make Equal

dp

Array Beauty

dp

Count Pairs

math, matrices, number theory, two pointers

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Add on a Tree

trees

Gang Up

flows, graphs

Expected Square Beauty

dp, math, probabilities

Tree Painting

dfs and similar, dp, trees

Subarray Sorting

data structures, sortings

Vasya And Array

constructive algorithms, greedy, implementation

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Vus the Cossack and a Field

divide and conquer, implementation, math

Vus the Cossack and Strings

implementation, math

Playlist for Polycarp (hard version)

combinatorics, dp

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Two Pizzas

bitmasks, brute force

Polycarp and Snakes

brute force, implementation

Extra Element

implementation, math

Exam in BerSU (hard version)

brute force, data structures, greedy, math

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Daleks' Invasion (easy)

graphs, trees

Parallel Universes (Hard)

math, matrices

Parallel Universes (Easy)

implementation

Heidi and the Turing Test (Hard)

Heidi and the Turing Test (Medium)

data structures

Heidi and the Turing Test (Easy)

implementation

The Doctor Meets Vader (Hard)

flows, shortest paths

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Heidi Learns Hashing (Hard)

fft, math, number theory

Heidi Learns Hashing (Medium)

brute force, number theory

Subsequences (hard version)

dp, strings

Candy Box (hard version)

greedy, implementation, sortings

Topforces Strikes Back

brute force, math, sortings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Maximum Sine

binary search, data structures, number theory

Product Oriented Recurrence

dp, math, matrices, number theory

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Beautiful Lyrics

data structures, greedy, strings

A Story of One Country (Hard)

brute force, greedy, sortings

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

Flag

brute force, combinatorics, dp, implementation

Alesya and Discrete Math

divide and conquer, interactive

Fedor Runs for President

data structures, dp, trees

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Tolik and His Uncle

constructive algorithms

Stock Exchange

binary search, flows, graphs

The Awesomest Vertex

data structures, dfs and similar

Long Colorful Strip

dp

Short Colorful Strip

combinatorics, dfs and similar, dp

Archaeology

brute force, constructive algorithms, greedy, strings

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Destroy it!

dp, implementation, sortings

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Array Splitting

greedy, sortings

Electrification

binary search, brute force, greedy

Catch Overflow!

data structures, expression parsing, implementation

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Ehab and the Expected XOR Problem

bitmasks, constructive algorithms

Nauuo and Bug

data structures

Nauuo and ODT

data structures

Nauuo and Portals

constructive algorithms

Nauuo and Pictures (hard version)

dp, probabilities

Nauuo and Pictures (easy version)

dp, probabilities

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Nauuo and Cards

greedy, implementation

Xor Permutations

constructive algorithms, math

Anagram Paths

dp, implementation, trees

And Reachability

bitmasks, dp