ABC String

bitmasks, brute force, implementation

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Planet Lapituletti

brute force, implementation

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

K-th Largest Value

brute force, greedy, implementation

Permutation Transformation

dfs and similar, divide and conquer, implementation

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Minimum Ties

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation, math

Arena

implementation, sortings

Shifting Stacks

greedy, implementation

Replace and Keep Sorted

dp, implementation, math

Playlist

data structures, dsu, implementation, shortest paths

Basic Diplomacy

brute force, constructive algorithms, greedy, implementation

Restore Modulo

implementation, math

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

New Colony

brute force, greedy, implementation

The Great Hero

greedy, implementation, sortings

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Symmetric Array

implementation, math, sortings

Journey

dfs and similar, dp, dsu, implementation

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Program

data structures, dp, implementation, strings

Replacing Elements

greedy, implementation, math, sortings

Strange List

brute force, greedy, implementation, math

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Building a Fence

dp, greedy, implementation, two pointers

Waste Sorting

greedy, implementation

Similar Sets

data structures, graphs, implementation

The Robot

brute force, implementation

Plane Tiling

geometry, implementation, math

Berpizza

data structures, implementation

Hills And Valleys

brute force, implementation

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Busy Robot

implementation

Close Tuples (hard version)

binary search, combinatorics, implementation, math, sortings, two pointers

Last Year's Substring

dp, implementation, strings

Favorite Sequence

implementation, two pointers

Water Level

brute force, graphs, greedy, implementation, math

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Find the Spruce

brute force, dp, implementation

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Sequence Transformation

greedy, implementation

Unique Bid Auction

implementation

Triangles

greedy, implementation

Suffix Operations

constructive algorithms, implementation

Cancel the Trains

implementation

String Equality

dp, greedy, hashing, implementation, strings

Non-Substring Subsequence

dp, greedy, implementation, strings

Multithreading (Hard Version)

combinatorics, implementation, math

Rating Compression

binary search, data structures, greedy, implementation, two pointers

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Buy the String

implementation, math

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Binary Table (Easy Version)

constructive algorithms, implementation

Specific Tastes of Andre

constructive algorithms, implementation

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Yet Another Bookshelf

greedy, implementation

Boring Apartments

implementation, math

Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Barrels

greedy, implementation, sortings

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Belted Rooms

graphs, implementation

Unshuffling a Deck

constructive algorithms, implementation

Chess Cheater

greedy, implementation, sortings

Symmetric Matrix

implementation

Floor Number

implementation, math

Excitation of Atoms

greedy, implementation

Minlexes

dp, greedy, implementation, strings

Nice Matrix

greedy, implementation, math

Swedish Heroes

brute force, dp, implementation

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Putting Bricks in the Wall

constructive algorithms, implementation

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Decryption

constructive algorithms, implementation, math, number theory

Killjoy

greedy, implementation, math

Stairs

brute force, constructive algorithms, greedy, implementation, math

Digit Game

games, greedy, implementation

Trash Problem

data structures, implementation

Showing Off

flows, graph matchings, greedy, implementation

Graph and Queries

data structures, dsu, graphs, implementation, trees

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Bouncing Ball

brute force, dp, implementation

Shurikens

data structures, greedy, implementation

Perform Easily

binary search, brute force, dp, implementation, sortings, two pointers

A New Technique

implementation

Grime Zoo

brute force, greedy, implementation, strings

In-game Chat

implementation

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Maximum Product

brute force, dp, greedy, implementation, sortings

Subset Mex

greedy, implementation, math

Array Cancellation

constructive algorithms, implementation

Balanced Bitstring

implementation, strings

Chess Rush

*special problem, combinatorics, dp, implementation, math