Enormous XOR

bitmasks, constructive algorithms, greedy, implementation, strings, two pointers

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Anti-knapsack

constructive algorithms, greedy

Delete The Edges

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

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Switch and Flip

constructive algorithms, graphs, math

Magnets

binary search, constructive algorithms, interactive

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Almost Fault-Tolerant Database

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

Genius's Gambit

bitmasks, constructive algorithms, greedy, math

Balanced Remainders

brute force, constructive algorithms, math

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Minimum Ties

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

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Continuous City

bitmasks, constructive algorithms

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Fence Painting

brute force, constructive algorithms, greedy

K-divisible Sum

binary search, constructive algorithms, greedy, math

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Nezzar and Board

constructive algorithms, math, number theory

Unusual Matrix

2-sat, brute force, constructive algorithms

What Is It?

constructive algorithms, greedy

Array Destruction

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

Different Divisors

binary search, constructive algorithms, greedy, math, number theory

No More Inversions

constructive algorithms, math

Three Bags

constructive algorithms, greedy

Wizard of Orz

constructive algorithms, greedy, math

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

Ceil Divisions

brute force, constructive algorithms, math, number theory

Regular Bracket Sequence

constructive algorithms, greedy

K and Medians

constructive algorithms, greedy, math

Plan of Lectures

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

Pairs

binary search, constructive algorithms, greedy, two pointers

Find The Array

bitmasks, constructive algorithms, greedy

Mathematical Expression

constructive algorithms, dp, greedy

String Generation

constructive algorithms, greedy

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

The Struggling Contestant

constructive algorithms, greedy

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Avoid Trygub

constructive algorithms, sortings

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Suffix Operations

constructive algorithms, implementation

Four Points

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

Ping-pong

constructive algorithms, games, math

Jumps

constructive algorithms, math

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms

Number into Sequence

constructive algorithms, math, number theory

Special Permutation

constructive algorithms, probabilities

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Nullify The Matrix

constructive algorithms, games

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Divide Powers

constructive algorithms, greedy

Graph Subset Problem

constructive algorithms, data structures, graphs

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Binary Table (Easy Version)

constructive algorithms, implementation

Add Candies

constructive algorithms, math

Long Recovery

constructive algorithms, dfs and similar

Knapsack

constructive algorithms, greedy, sortings

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Powerful Ksenia

bitmasks, constructive algorithms, math

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

Specific Tastes of Andre

constructive algorithms, implementation

Black, White and Grey Tree

binary search, constructive algorithms, dfs and similar, dp, greedy, trees

Extreme Subtraction

constructive algorithms, dp, greedy

Kids Seating

constructive algorithms, math

Rectangular Polyline

constructive algorithms, dp, geometry

Make It Increasing

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

Reverse Binary Strings

constructive algorithms, greedy

Marketing Scheme

brute force, constructive algorithms, greedy, math

Finding Sasuke

constructive algorithms, math

Prime Square

constructive algorithms, math

Districts Connection

constructive algorithms, dfs and similar

Dominant Piranha

constructive algorithms, greedy

Hexagons

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

Palindromifier

constructive algorithms, strings

Putting Bricks in the Wall

constructive algorithms, implementation

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Number of Apartments

brute force, constructive algorithms, math

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Unshuffling a Deck

constructive algorithms, implementation

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Two Different

constructive algorithms, divide and conquer

Arrays Sum

constructive algorithms, greedy, math

Circle Coloring

constructive algorithms

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Increase and Copy

binary search, constructive algorithms, math

Make Them Equal

constructive algorithms, greedy, math

Huge Boxes of Animal Toys

constructive algorithms

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Decryption

constructive algorithms, implementation, math, number theory