Duck Hunt

data structures

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Freak Joker Process

binary search, data structures, sortings

Fox and Meteor Shower

geometry

DZY Loves Bridges

math, matrices

Intranet of Buses

binary search, geometry, implementation, two pointers

Grid Sort

implementation

String Theory

geometry, math, strings

Fugitive Frenzy

math, probabilities

Parallel Universes (Hard)

math, matrices

Unequal Adjacent Elements

constructive algorithms, sortings

Distance Sum

graphs

Homework

constructive algorithms

Parametric Circulation

binary search, flows

Ber Patio

Division Avoidance

greedy, math

Polycarpus and Tasks

Satellites

Cipher

implementation

Arithmancy (Hard)

interactive

Death Stars (hard)

Road Repair in Treeland

*special problem, binary search, dp, trees

Captain of Knights

math

Does anyone else hate the wind?

Demonic Invasion

*special problem, flows

Flower Shop

*special problem, data structures, fft, math

Equal Trees

*special problem, graphs, meet-in-the-middle

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

Little C Loves 3 III

bitmasks, dp, math

Restoring Map

bitmasks, constructive algorithms, trees

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

Wise Men (Hard Version)

bitmasks, dp, math

Yui and Mahjong Set

constructive algorithms, interactive

Puzzle Lover

dp, hashing, strings

Reunion

combinatorics, dp, trees

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

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

Pepe Racing

constructive algorithms, implementation, interactive, sortings

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Boring Card Game

data structures, greedy, trees

Sharti

data structures, games

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

Split

binary search, data structures, dp, greedy

Line Distance

binary search, data structures, geometry

Tree Cutting

bitmasks, dfs and similar, dp

Cycle Palindrome

constructive algorithms, graphs, math

Asterism Stream

dp, math, matrices

Inverse Inversions

binary search, brute force, data structures

Vabank

binary search, interactive

Ants

2-sat, data structures, trees

Piet's Palette

matrices

Zombies

binary search, dp

Geometric Progressions

math