Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Cow and Snacks

dfs and similar, dsu, graphs

Paint the Digits

constructive algorithms, greedy, implementation

Koala and Lights

implementation, math, number theory

Paint the Numbers

greedy, implementation, math

Red Blue Tree

data structures, implementation, trees

Polygons

greedy, math, number theory

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Let Them Slide

data structures, implementation

Restore Permutation

binary search, data structures, greedy, implementation

Magic Grid

constructive algorithms

Uniqueness

binary search, brute force, implementation, two pointers

XORinacci

math

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Remainder Problem

brute force, data structures, implementation

XOR Guessing

bitmasks, interactive, math

Number Of Permutations

combinatorics

Gas Pipeline

dp, greedy

Square Filling

constructive algorithms, greedy, implementation

There Are Two Types Of Burgers

brute force, greedy, implementation, math

Make Product Equal One

dp, implementation

Choose Two Numbers

math, sortings

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

Almost Equal

constructive algorithms, greedy, math

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

Mislove Has Lost an Array

greedy, math

BowWow and the Timetable

math

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

Common Divisors

implementation, math

Equal Rectangles

greedy, math

Circle of Students

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

You Are Given Two Binary Strings...

bitmasks, greedy

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

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