Beauty of a Permutation

constructive algorithms, math

Expected Value Again

combinatorics, strings

Almost All

constructive algorithms, trees

Palindromic Paths

implementation, interactive

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Complete the Projects (hard version)

dp, greedy

Complete the Projects (easy version)

greedy

Boxers

greedy, sortings

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

Remove the Substring (easy version)

greedy, implementation

You Are Given Some Letters...

binary search, implementation, math

You Are Given Some Strings...

brute force, string suffix structures, strings

Print a 1337-string...

combinatorics, constructive algorithms, math, strings

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

You Are Given a Decimal String...

brute force, dp, shortest paths

Knightmare (hard)

graphs, interactive, shortest paths

Knightmare (easy)

graphs, interactive, shortest paths

Treasure Hunting

binary search, dp, greedy, implementation

Maximum Median

binary search, greedy, math, sortings

Zero Array

greedy, math

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

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

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

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

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

Tokitsukaze and Discard Items

implementation, two pointers

Candies!

data structures, dp, implementation, math

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 Numbers

constructive algorithms, greedy, 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

The Doctor Meets Vader (Easy)

binary search, 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

Candy Box (easy version)

greedy, sortings

Computer Game

binary search, math

Maximum Sine

binary search, data structures, number theory