AmShZ Wins a Bet

data structures, greedy, hashing

Organizing a Race

data structures, greedy

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Nauuo and Bug

data structures

Nastya and CBS

brute force, data structures, hashing

Cartesian Tree

data structures

A New Beginning

data structures, dp, geometry, sortings

Number of Components

data structures

String Journey

data structures, dp, string suffix structures

Painting Edges

binary search, data structures

Physical Examination

*special problem, binary search, data structures

Two Arrays

data structures, matrices

Expression Queries

data structures

Detect Robots

data structures, strings

ELCA

data structures, trees

Two Posters

brute force, data structures, greedy, two pointers

Mashmokh's Designed Problem

data structures

The Third Grace

data structures, dp

Ants

2-sat, data structures, trees

Inverse Inversions

binary search, brute force, data structures

Line Distance

binary search, data structures, geometry

Split

binary search, data structures, dp, greedy

Listening to Music

constructive algorithms, data structures

Sasha and Algorithm of Silence's Sounds

data structures, trees

Feeling Good

bitmasks, data structures

Strange Permutation

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

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

Raining season

data structures, divide and conquer, trees

Segment Covering

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

Teleportation in Byteland

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

Into Blocks (hard version)

data structures

Air Reform

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

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Equal LCM Subsets

data structures, math, number theory

Qingshan and Daniel

brute force, data structures, greedy, implementation

Shifting Dominoes

data structures, geometry, graphs, trees

Try Booking

data structures, divide and conquer

Fedya the Potter Strikes Back

data structures, strings

Clockwork Bomb

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

ALT

data structures, flows, graphs, trees

Summer Dichotomy

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

Weighted Increasing Subsequences

data structures, dp, math

The Tree

data structures

Choosing Ads

data structures

Security

data structures, string suffix structures

Bear and Bowling

data structures, greedy

Tourists

data structures, dfs and similar, graphs, trees

Flower Shop

*special problem, data structures, fft, math

Freak Joker Process

binary search, data structures, sortings

Duck Hunt

data structures

Dreamoon and Notepad

data structures

Array Covering

data structures

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Graph Coloring

data structures, graphs, interactive

Mages and Monsters

data structures, geometry

Just Kingdom

brute force, data structures, dfs and similar

Slalom

data structures, dp, sortings

Prefix Max Set Counting

data structures, dp, trees

Two Subtrees

data structures, trees

Secret Letters

data structures, dp, greedy

Santa's Gift

data structures, trees

K Paths

combinatorics, data structures, dp, fft, math

Train Tracks

data structures, trees

No Monotone Triples

data structures

Tricky Password

data structures

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Dreamoon Likes Strings

constructive algorithms, data structures

Tavas on the Path

data structures, divide and conquer, trees

Squid Game

data structures, dfs and similar, greedy, trees

Nagini

binary search, data structures

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Nim Shortcuts

data structures, games

Huffman Coding on Segment

data structures, greedy

Raffles

data structures, dp, greedy, math

Minimum Difference

data structures, hashing, sortings, two pointers

LCC

data structures, math, matrices, probabilities

Fibonacci-ish II

data structures, implementation

Little Pony and Lord Tirek

data structures

Campus

binary search, data structures, dsu, trees

Bear and Bad Powers of 42

data structures

k-d-sequence

data structures

Groceries in Meteor Town

binary search, data structures, dsu, trees

Flip and Reverse

data structures, graphs, greedy

Archaeology

data structures, dfs and similar, trees

Forensic Examination

data structures, string suffix structures

Souvenirs

data structures

Welcome home, Chtholly

data structures, dsu

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Guarding warehouses

data structures, geometry

Soap Time! - 2

binary search, data structures

PermutationForces

data structures, greedy

Decent Division

constructive algorithms, data structures

Cyclic Sum

data structures, fft, number theory

Escaping on Beaveractor

data structures, implementation, trees

Matrix

data structures

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy