Cards Sorting

data structures, implementation, sortings

Destiny

data structures, probabilities

Telepanting

binary search, data structures, dp, sortings

DZY Loves Colors

data structures

Lynyrd Skynyrd

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

Portals

data structures, dp, greedy, implementation, sortings

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Video Cards

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

Segments Removal

data structures, dsu, flows, implementation, two pointers

Petr#

brute force, data structures, hashing, strings

Array Collapse

data structures, divide and conquer, dp, trees

Trees and Segments

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

Choosing The Commander

bitmasks, data structures, 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

Spy Syndrome 2

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

Gold Transfer

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

Antenna Coverage

data structures, dp, greedy, sortings

Trains and Statistic

data structures, dp, greedy

Mass Change Queries

data structures

Four Segments

brute force, data structures, dp

Processing Queries

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

Promising String (hard version)

data structures, implementation, math, strings

Hossam and (sub-)palindromic tree

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

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Editor

data structures, implementation

Tricky Function

data structures, divide and conquer, geometry

Range Deleting

binary search, combinatorics, data structures, two pointers

Leaving Auction

binary search, data structures

Text Editor

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

Till I Collapse

data structures, divide and conquer

Escape Through Leaf

data structures, dp, geometry

Equilibrium

data structures, dp, greedy

Count Binary Strings

data structures, dp

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

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

Sum Over Zero

data structures, dfs and similar, dp

You Are Given a WASD-string...

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

Ezzat and Grid

data structures, dp, greedy

PolandBall and Polygon

data structures

Guess Game

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

Stack Sorting

constructive algorithms, data structures, greedy, implementation

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

data structures, dfs and similar, trees

Subarray Sorting

data structures, sortings

XOR Tree

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

Pinball

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

388535 (Hard Version)

bitmasks, brute force, data structures, math

Machine Learning

brute force, data structures

Learning to Paint

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

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

Voting (Hard Version)

binary search, data structures, greedy

Handshakes

binary search, constructive algorithms, data structures, greedy

Qpwoeirut and Vertices

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

Kill Anton

brute force, constructive algorithms, data structures, 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

Counting Shortcuts

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

Unstable String Sort

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

Wi-Fi

data structures, dp, greedy

Driving Test

data structures, dp, greedy

Anonymity Is Important

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

Misha and Permutations Summation

data structures

Lunar New Year and Red Envelopes

data structures, dp

Pudding Monsters

data structures, divide and conquer

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Connected Components

data structures, dfs and similar, dp, dsu

Felicity is Coming!

data structures, hashing, sortings, strings

TV Shows

data structures, greedy, implementation, sortings

Maxim and Array

constructive algorithms, data structures, greedy, math

Space Harbour

data structures, implementation, math, sortings

Hot Start Up (hard version)

data structures, dp

Army Creation

binary search, data structures

Analysis of Pathes in Functional Graph

data structures, graphs

Dense Subsequence

data structures, greedy, strings

Removing Leaves

data structures, greedy, implementation, trees

Leha and another game about graph

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

Shark

brute force, data structures, dsu, trees

Statistics of Recompressing Videos

*special problem, data structures, implementation

Staircases

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

Pattern Matching

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

Not Escaping

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

Multi-Colored Segments

binary search, data structures, math, sortings

Product Sum

data structures, dp, geometry

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

Yaroslav and Divisors

data structures

Cartons of milk

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