Maximum Median

binary search, greedy, math, sortings

Zero Array

greedy, math

Important Exam

implementation, strings

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Compress Words

brute force, hashing, implementation, string suffix structures, strings

White Lines

brute force, data structures, dp, implementation, two pointers

Round Corridor

math, number theory

Block Adventure

dp, greedy

Hotelier

brute force, data structures, implementation

Water Lily

geometry, math

City Day

implementation

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

Array Splitting

greedy, sortings

Pillars

greedy, implementation

DIY Wooden Ladder

greedy, math, sortings

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

RGB Substring (easy version)

implementation

Robot Breakout

implementation

Odd Sum Segments

constructive algorithms, math

Three Piles of Candies

brute force, constructive algorithms, math

Geometers Anonymous Club

data structures, geometry, math, sortings

OpenStreetMap

data structures, two pointers

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

Basketball Exercise

dp

Sport Mafia

binary search, brute force, math

Drinks Choosing

greedy, math

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

From S To T

implementation, strings

Yet Another Crosses Problem

implementation

Remove a Progression

math

Scissors and Tape

*special problem, constructive algorithms, geometry

Magic Tree

*special problem, data structures, dp, trees

Amusement Park

*special problem, dp, math

Cubeword

*special problem, brute force, dp, meet-in-the-middle

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

Building Skyscrapers

*special problem

Tokitsukaze and Mahjong

brute force, implementation

Tokitsukaze and Enhancement

brute force

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

Tokitsukaze and Discard Items

implementation, two pointers

Candies!

data structures, dp, implementation, math

Number Circle

greedy, math, sortings

Keanu Reeves

strings

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

Letters Shop

binary search, implementation, strings

Stickers and Toys

math

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 Numbers

constructive algorithms, greedy, math

Vus the Cossack and Strings

implementation, math

Vus the Cossack and a Contest

implementation

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

Exam in BerSU (easy version)

greedy, sortings

Email from Polycarp

implementation, strings

Ropewalkers

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

The Doctor Meets Vader (Easy)

binary search, sortings

Heidi Learns Hashing (Hard)

fft, math, number theory