Subarray Sorting

data structures, sortings

Sum Over Zero

data structures, dfs and similar, dp

Ezzat and Grid

data structures, dp, greedy

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

PolandBall and Polygon

data structures

Bracket Sequence

data structures, expression parsing, implementation

Fixed Point Removal

binary search, constructive algorithms, data structures, greedy, two pointers

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Buses

binary search, data structures, dp

Count Binary Strings

data structures, dp

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Leaving Auction

binary search, data structures

Equilibrium

data structures, dp, greedy

Escape Through Leaf

data structures, dp, geometry

Till I Collapse

data structures, divide and conquer

Text Editor

data structures, dfs and similar, graphs, greedy, shortest paths

Editor

data structures, implementation

Mass Change Queries

data structures

Tricky Function

data structures, divide and conquer, geometry

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Promising String (hard version)

data structures, implementation, math, strings

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Trains and Statistic

data structures, dp, greedy

Processing Queries

*special problem, constructive algorithms, data structures, two pointers

Four Segments

brute force, data structures, dp

Antenna Coverage

data structures, dp, greedy, sortings

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

The Great Equalizer

binary search, data structures, math, sortings

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Factory Repairs

data structures

Pathwalks

data structures, dp, graphs

Array Collapse

data structures, divide and conquer, dp, trees

Tree Master

brute force, data structures, dfs and similar, trees

Contest Balloons

data structures, greedy

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Choosing The Commander

bitmasks, data structures, trees

Petr#

brute force, data structures, hashing, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Portals

data structures, dp, greedy, implementation, sortings

Video Cards

brute force, data structures, implementation, math, number theory

Destiny

data structures, probabilities

DZY Loves Colors

data structures

Telepanting

binary search, data structures, dp, sortings

Cards Sorting

data structures, implementation, sortings

Serega and Fun

data structures

OpenStreetMap

data structures, two pointers

Funny Substrings

data structures, hashing, implementation, matrices, strings

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Great Vova Wall (Version 2)

data structures, implementation

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Pictures with Kittens (hard version)

data structures, dp

Tyler and Strings

combinatorics, data structures, implementation

Workout plan

data structures, greedy

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Lucky Queries

data structures

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Little Artem and Time Machine

data structures

New Year and Conference

binary search, data structures, hashing, sortings

Credit Card

data structures, dp, greedy, implementation

String Manipulation 1.0

*special problem, binary search, brute force, data structures, strings

Skyline Photo

data structures, divide and conquer, dp

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Expand the Path

brute force, combinatorics, data structures, implementation, math

Let's Play the Words?

data structures, hashing, implementation, math

Bank Hacking

constructive algorithms, data structures, dp, trees

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Centroids

data structures, dfs and similar, dp, graphs, greedy, trees

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Exposition

binary search, data structures, dsu, trees, two pointers

Minimal Labels

data structures, dfs and similar, graphs, greedy

Almost Triple Deletions

data structures, dp, greedy

Number of Components

combinatorics, data structures, dp, math

MEX vs DIFF

binary search, brute force, constructive algorithms, data structures, greedy, two pointers

Bracket Walk

data structures, greedy, strings

Friends and Subsequences

binary search, data structures

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

Nezzar and Binary String

data structures, greedy

Generating Sets

binary search, data structures, dfs and similar, greedy, strings, trees

Restructuring Company

data structures, dsu

Pillars

binary search, data structures, dp, sortings, trees

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Willem, Chtholly and Seniorious

data structures, probabilities

Yet Another Array Queries Problem

data structures, implementation

Correct Bracket Sequence Editor

data structures, dsu, strings

DZY Loves Fibonacci Numbers

data structures, math, number theory

Cats Transport

data structures, dp

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Music Festival

binary search, data structures, dp, greedy, sortings

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Vitya and Strange Lesson

binary search, data structures

Count the Trains

binary search, data structures, greedy, sortings