Polycarpus and Tasks

Satellites

Cipher

implementation

Death Stars (hard)

Road Repair in Treeland

*special problem, binary search, dp, trees

Arithmancy (Hard)

interactive

Captain of Knights

math

Does anyone else hate the wind?

Demonic Invasion

*special problem, flows

Flower Shop

*special problem, data structures, fft, math

Tourists

data structures, dfs and similar, graphs, trees

Bear and Bowling

data structures, greedy

Security

data structures, string suffix structures

Choosing Ads

data structures

PolandBall and Many Other Balls

combinatorics, divide and conquer, dp, fft, math, number theory

Slime and Biscuits

math, probabilities

The Tree

data structures

Birthday

graph matchings, strings

Digits of Number Pi

dp, implementation, strings

The Maximum Prefix

dp

Summer Dichotomy

2-sat, data structures, dfs and similar, greedy

Weighted Increasing Subsequences

data structures, dp, math

Company Acquisitions

constructive algorithms, math

ALT

data structures, flows, graphs, trees

Restoring Map

bitmasks, constructive algorithms, trees

Little C Loves 3 III

bitmasks, dp, math

Clockwork Bomb

data structures, dfs and similar, dsu, greedy, trees

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Kyoya and Train

dp, fft, graphs, math, probabilities

Mirror Box

matrices, trees

MEX counting

combinatorics, dp, implementation

Triple

fft, math

Fedya the Potter Strikes Back

data structures, strings

Pink Floyd

graphs, interactive

Invertation in Tournament

brute force, divide and conquer, graphs, math

Election Promises

games, graphs

Yui and Mahjong Set

constructive algorithms, interactive

Wise Men (Hard Version)

bitmasks, dp, math

Puzzle Lover

dp, hashing, strings

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Reunion

combinatorics, dp, trees

In a Trap

trees

New Year and the Tricolore Recreation

games

Equal LCM Subsets

data structures, math, number theory

Qingshan and Daniel

brute force, data structures, greedy, implementation

A Perfect Problem

combinatorics, dp, math

Try Booking

data structures, divide and conquer

Shifting Dominoes

data structures, geometry, graphs, trees

Chests and Keys

bitmasks, brute force, dfs and similar, dp, flows

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Into Blocks (hard version)

data structures

Joking (Hard Version)

dp, interactive

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Mergesort Strikes Back

math, probabilities

Raining season

data structures, divide and conquer, trees

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Distance Matching

constructive algorithms, dfs and similar, trees

Special Edges

flows, graphs

Cross Xor

constructive algorithms, graphs, math, matrices

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Boring Card Game

data structures, greedy, trees

Sharti

data structures, games

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Triameter

binary search, data structures, dfs and similar, trees

A Game on Strings

games

Strange Permutation

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

Feeling Good

bitmasks, data structures

Sasha and Algorithm of Silence's Sounds

data structures, trees

Listening to Music

constructive algorithms, data structures

Line Distance

binary search, data structures, geometry

Tree Cutting

bitmasks, dfs and similar, dp

Split

binary search, data structures, dp, greedy

Asterism Stream

dp, math, matrices

Cycle Palindrome

constructive algorithms, graphs, math

Vabank

binary search, interactive

Inverse Inversions

binary search, brute force, data structures

Ants

2-sat, data structures, trees

Piet's Palette

matrices

Zombies

binary search, dp

Geometric Progressions

math

Roads in E City

interactive, math, probabilities, trees

Wooden Raft

binary search, math, number theory

The Third Grace

data structures, dp

Bimatching

graphs

Diverse Coloring

constructive algorithms, trees

Eligible Segments

geometry

Thanos Snap

binary search, dp, games, greedy, trees

New Year and the Factorisation Collaboration

interactive, math, number theory

Power Substring

math, number theory

Mashmokh's Designed Problem

data structures

Two Posters

brute force, data structures, greedy, two pointers

Marek and Matching (hard version)

brute force, probabilities

Kingdom Partition

flows

A Preponderant Reunion

constructive algorithms, dp

ELCA

data structures, trees

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Alesya and Discrete Math

divide and conquer, interactive