Video Cards

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

Portals

data structures, dp, greedy, implementation, sortings

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Segments Removal

data structures, dsu, flows, implementation, two pointers

Petr#

brute force, data structures, hashing, strings

Trees and Segments

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

Choosing The Commander

bitmasks, data structures, trees

Array Collapse

data structures, divide and conquer, dp, trees

Lynyrd Skynyrd

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

Tree Master

brute force, data structures, dfs and similar, trees

Contest Balloons

data structures, greedy

Pathwalks

data structures, dp, graphs

Factory Repairs

data structures

The Great Equalizer

binary search, data structures, math, sortings

Gold Transfer

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

Antenna Coverage

data structures, dp, greedy, sortings

Four Segments

brute force, data structures, dp

Processing Queries

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

Spy Syndrome 2

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

Trains and Statistic

data structures, dp, greedy

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Hossam and (sub-)palindromic tree

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

Promising String (hard version)

data structures, implementation, math, strings

Tricky Function

data structures, divide and conquer, geometry

Mass Change Queries

data structures

Editor

data structures, implementation

Leaving Auction

binary search, data structures

Text Editor

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

Escape Through Leaf

data structures, dp, geometry

Till I Collapse

data structures, divide and conquer

Equilibrium

data structures, dp, greedy

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Count Binary Strings

data structures, dp

Dogeforces

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

Buses

binary search, data structures, dp

Fixed Point Removal

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

Bracket Sequence

data structures, expression parsing, implementation

PolandBall and Polygon

data structures

Sum Over Zero

data structures, dfs and similar, dp

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Guess Game

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

Ezzat and Grid

data structures, dp, greedy

Subarray Sorting

data structures, sortings

Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths

data structures, dfs and similar, trees

388535 (Hard Version)

bitmasks, brute force, data structures, math

XOR Tree

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

Range Deleting

binary search, combinatorics, data structures, two pointers

Machine Learning

brute force, data structures

Kindergarten

data structures, dp, greedy

Sereja ans Anagrams

binary search, data structures

MEX Queries

binary search, data structures, trees

Lexicographically Small Enough

brute force, data structures, greedy, strings

Pinball

binary search, data structures, implementation, math, two pointers

Handshakes

binary search, constructive algorithms, data structures, greedy

Learning to Paint

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

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Voting (Hard Version)

binary search, data structures, greedy

Kill Anton

brute force, constructive algorithms, data structures, math, strings

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Rain

binary search, brute force, data structures, geometry, greedy, implementation, math

Monitor

binary search, data structures

Permutation Separation

data structures, divide and conquer

Wi-Fi

data structures, dp, greedy

Counting Shortcuts

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

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Driving Test

data structures, dp, greedy

Misha and Permutations Summation

data structures

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Lunar New Year and Red Envelopes

data structures, dp

Felicity is Coming!

data structures, hashing, sortings, strings

Connected Components

data structures, dfs and similar, dp, dsu

Pudding Monsters

data structures, divide and conquer

Imbalance Value of a Tree

data structures, dsu, graphs, trees

TV Shows

data structures, greedy, implementation, sortings

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Army Creation

binary search, data structures

Analysis of Pathes in Functional Graph

data structures, graphs

Space Harbour

data structures, implementation, math, sortings

Hot Start Up (hard version)

data structures, dp

Maxim and Array

constructive algorithms, data structures, greedy, math

Dense Subsequence

data structures, greedy, strings

Shark

brute force, data structures, dsu, trees

Removing Leaves

data structures, greedy, implementation, trees

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Statistics of Recompressing Videos

*special problem, data structures, implementation

Staircases

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

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Multi-Colored Segments

binary search, data structures, math, sortings

Envy

data structures, dsu, graphs

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Domino Principle

binary search, data structures, sortings

Random Query

data structures, math, probabilities, two pointers

Product Sum

data structures, dp, geometry

Yaroslav and Divisors

data structures

Cartons of milk

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

Suspects

constructive algorithms, data structures, implementation

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Ball Sorting

data structures, dp, sortings

Sign on Fence

binary search, constructive algorithms, data structures