Watching Fireworks is Fun

data structures, dp, math

Yet Another Sorting Problem

data structures, math

Tree Construction

data structures, trees

Even Path

data structures, implementation

Vasya and a Tree

data structures, trees

Professor Higashikata

data structures, dsu, greedy, implementation, strings

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Fountains

binary search, data structures, implementation

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Kirill and Mushrooms

data structures, sortings

Portal

brute force, data structures, dp, greedy, implementation

Petya and Divisors

binary search, data structures, number theory

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

One Occurrence

data structures, divide and conquer

DZY Loves Modification

brute force, data structures, greedy

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Non-Decreasing Dilemma

data structures, divide and conquer, math

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Cyclic MEX

data structures, implementation, math, two pointers

Optimal Partition

data structures, dp

Tufurama

data structures

Sum of Progression

brute force, data structures, dp, implementation, math

Money Transfers

constructive algorithms, data structures, greedy, sortings

Cashback

data structures, dp, greedy, math

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Lazy Student

constructive algorithms, data structures, graphs

Multicolored Cars

data structures, implementation

Feed Cats

data structures, dp, sortings

A Growing Tree

data structures, dfs and similar, trees

Three Sequences

constructive algorithms, data structures, greedy, math

Sasha and Array

data structures, math, matrices

Sausage Maximization

bitmasks, data structures, trees

Equal XOR Segments

binary search, data structures

Strip

binary search, data structures, dp, two pointers

The Wu

bitmasks, brute force, data structures

Messenger Simulator

data structures

Mishka and Interesting sum

data structures

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Monocarp and the Set

combinatorics, data structures, math

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Beautiful Mirrors

data structures, dp, math, probabilities

Mahmoud and a Dictionary

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

Pencils and Boxes

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

Count the Trains

binary search, data structures, greedy, sortings

Music Festival

binary search, data structures, dp, greedy, sortings

Vitya and Strange Lesson

binary search, data structures

Cats Transport

data structures, dp

Minimal Segment Cover

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

Travelling Salesman Problem

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

DZY Loves Fibonacci Numbers

data structures, math, number theory

Count Paths

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

Willem, Chtholly and Seniorious

data structures, probabilities

Correct Bracket Sequence Editor

data structures, dsu, strings

Yet Another Array Queries Problem

data structures, implementation

Pillars

binary search, data structures, dp, sortings, trees

Restructuring Company

data structures, dsu

Generating Sets

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

Bracket Walk

data structures, greedy, strings

Nezzar and Binary String

data structures, greedy

Friends and Subsequences

binary search, data structures

New Year and Fireworks

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

Number of Components

combinatorics, data structures, dp, math

MEX vs DIFF

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

Almost Triple Deletions

data structures, dp, greedy

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Expand the Path

brute force, combinatorics, data structures, implementation, math

Exposition

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

Shop Game

data structures, greedy, math, sortings

Minimal Labels

data structures, dfs and similar, graphs, greedy

Centroids

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

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Monsters

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

Bank Hacking

constructive algorithms, data structures, dp, trees

Blood Cousins Return

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

Let's Play the Words?

data structures, hashing, implementation, math

Turn Off The TV

data structures, sortings

Closest Equals

*special problem, data structures

Skyline Photo

data structures, divide and conquer, dp

Vlad and the Mountains

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

String Manipulation 1.0

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

Credit Card

data structures, dp, greedy, implementation

New Year and Conference

binary search, data structures, hashing, sortings

Little Artem and Time Machine

data structures

Unusual Entertainment

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

Lucky Queries

data structures

OpenStreetMap

data structures, two pointers

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Workout plan

data structures, greedy

Pictures with Kittens (hard version)

data structures, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Tyler and Strings

combinatorics, data structures, implementation

Great Vova Wall (Version 2)

data structures, implementation

Mahmoud and a xor trip

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

Serega and Fun

data structures

Funny Substrings

data structures, hashing, implementation, matrices, strings

Cards Sorting

data structures, implementation, sortings

Destiny

data structures, probabilities