Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Realistic Gameplay

dp, greedy

String Reversal

data structures, greedy, strings

String Deletion

binary search, data structures, greedy, two pointers

Rotary Laser Lock

binary search, interactive

Lucky Numbers (Hard Version)

dp, greedy

Lucky Numbers (Easy Version)

dp, greedy

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Prison Break

binary search, games, geometry, ternary search

One Billion Shades of Grey

flows, graphs

Boring Card Game

data structures, greedy, trees

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Unshuffling a Deck

constructive algorithms, implementation

The Hard Work of Paparazzi

dp

Chess Cheater

greedy, implementation, sortings

Number of Subsequences

combinatorics, dp, strings

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Impressive Harvesting of The Orchard

data structures

Flamingoes of Mystery

interactive

Excitation of Atoms

greedy, implementation

Danger of Mad Snakes

combinatorics, dp, math

Captain of Knights

math

Blue and Red of Our Faculty!

divide and conquer, dp

Arena of Greed

games, greedy

Ancient Language

graphs, sortings

BubbleSquare Tokens

Milutin's Plums

interactive

Light switches

meet-in-the-middle

Lonely Numbers

binary search, math, number theory, two pointers

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Lookup Tables

bitmasks

Virus

data structures, divide and conquer, dsu, graphs

Growing flowers

data structures

Coins

math

5G Antenna Towers

geometry

Does anyone else hate the wind?

Dušan's Railway

divide and conquer, graphs, trees

Valuable Paper

binary search, flows, graph matchings, graphs

Wakanda Forever

Boring Queries

data structures, math, number theory

Minlexes

dp, greedy, implementation, strings

Returning Home

graphs, shortest paths, sortings

Bargain

combinatorics, dp, math

Swedish Heroes

brute force, dp, implementation

Hexagons

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

Palindromifier

constructive algorithms, strings

Battle Lemmings

dp, greedy

Rescue Nibel!

combinatorics, data structures, sortings

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

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Killjoy

greedy, implementation, math

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Equal Product

data structures, math, number theory, two pointers

Expected Damage

binary search, combinatorics, probabilities

Trash Problem

data structures, implementation

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Showing Off

flows, graph matchings, greedy, implementation

Split

binary search, data structures, dp, greedy

Graph and Queries

data structures, dsu, graphs, implementation, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Make Them Equal

constructive algorithms, greedy, math

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Cakes for Clones

dp

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms

Bouncing Ball

brute force, dp, implementation

Roads and Ramen

data structures, trees

Solo mid Oracle

greedy, math, ternary search

Shurikens

data structures, greedy, implementation

Perform Easily

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

No Game No Life

bitmasks, games, math, matrices

The Thorny Path

greedy, math

Poman Numbers

bitmasks, greedy, math, strings

Grime Zoo

brute force, greedy, implementation, strings

Peaceful Rooks

dfs and similar, dsu, graphs

Subsequences of Length Two

dp, strings

Two Platforms

binary search, dp, sortings, two pointers

Decrease the Sum of Digits

greedy, math

Bitwise Magic

dp, math

Rainbow Triples

binary search, data structures, flows, greedy

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Two Different

constructive algorithms, divide and conquer

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Searchlights

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

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Arrays Sum

constructive algorithms, greedy, math

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Discrete Centrifugal Jumps

data structures, dp, graphs

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Deleting Numbers

interactive, math, number theory

Three Sequences

constructive algorithms, data structures, greedy, math

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Bricks

flows, graph matchings, graphs