Thanos Snap

binary search, dp, games, greedy, trees

Kingdom Partition

flows

The Third Grace

data structures, dp

Geometric Progressions

math

Zombies

binary search, dp

Ants

2-sat, data structures, trees

Inverse Inversions

binary search, brute force, data structures

Tree Cutting

bitmasks, dfs and similar, dp

Roads in E City

interactive, math, probabilities, trees

Asterism Stream

dp, math, matrices

Vabank

binary search, interactive

Split

binary search, data structures, dp, greedy

Feeling Good

bitmasks, data structures

Listening to Music

constructive algorithms, data structures

Sasha and Algorithm of Silence's Sounds

data structures, trees

Strange Permutation

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

A Game on Strings

games

Triameter

binary search, data structures, dfs and similar, trees

Boring Card Game

data structures, greedy, trees

Sharti

data structures, games

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Cross Xor

constructive algorithms, graphs, math, matrices

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Line Distance

binary search, data structures, geometry

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Raining season

data structures, divide and conquer, trees

Mergesort Strikes Back

math, probabilities

Special Edges

flows, graphs

Distance Matching

constructive algorithms, dfs and similar, trees

Twilight and Ancient Scroll (harder version)

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

Cycle Palindrome

constructive algorithms, graphs, math

Joking (Hard Version)

dp, interactive

Teleportation in Byteland

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

Air Reform

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

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Chests and Keys

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

A Perfect Problem

combinatorics, dp, math

Qingshan and Daniel

brute force, data structures, greedy, implementation

Into Blocks (hard version)

data structures

New Year and the Tricolore Recreation

games

Segment Covering

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

Try Booking

data structures, divide and conquer

In a Trap

trees

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

Piet's Palette

matrices

Reunion

combinatorics, dp, trees

Puzzle Lover

dp, hashing, strings

Yui and Mahjong Set

constructive algorithms, interactive

Wise Men (Hard Version)

bitmasks, dp, math

Invertation in Tournament

brute force, divide and conquer, graphs, math

Fedya the Potter Strikes Back

data structures, strings

Election Promises

games, graphs

Pink Floyd

graphs, interactive

Triple

fft, math

Mirror Box

matrices, trees

Kyoya and Train

dp, fft, graphs, math, probabilities

Equal LCM Subsets

data structures, math, number theory

MEX counting

combinatorics, dp, implementation

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Shifting Dominoes

data structures, geometry, graphs, trees

Clockwork Bomb

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

Restoring Map

bitmasks, constructive algorithms, trees

ALT

data structures, flows, graphs, trees

Little C Loves 3 III

bitmasks, dp, math

Summer Dichotomy

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

Weighted Increasing Subsequences

data structures, dp, math

Digits of Number Pi

dp, implementation, strings

The Maximum Prefix

dp

Company Acquisitions

constructive algorithms, math

Birthday

graph matchings, strings

The Tree

data structures

Slime and Biscuits

math, probabilities

PolandBall and Many Other Balls

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

Choosing Ads

data structures

Security

data structures, string suffix structures

Bear and Bowling

data structures, greedy

Tourists

data structures, dfs and similar, graphs, trees

Equal Trees

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

Flower Shop

*special problem, data structures, fft, math

Demonic Invasion

*special problem, flows

Does anyone else hate the wind?

Captain of Knights

math

Road Repair in Treeland

*special problem, binary search, dp, trees

Death Stars (hard)

Cipher

implementation

Polycarpus and Tasks

Satellites

Division Avoidance

greedy, math

Arithmancy (Hard)

interactive

Ber Patio

Distance Sum

graphs

Homework

constructive algorithms

Unequal Adjacent Elements

constructive algorithms, sortings

Parallel Universes (Hard)

math, matrices

String Theory

geometry, math, strings

Fugitive Frenzy

math, probabilities

Parametric Circulation

binary search, flows

Grid Sort

implementation

Intranet of Buses

binary search, geometry, implementation, two pointers

Fox and Meteor Shower

geometry