Mahmoud and a xor trip

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

Mahmoud and a Dictionary

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

Souvenirs

data structures

Timofey and our friends animals

data structures, divide and conquer, dsu

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Radio stations

binary search, data structures

Dasha and Photos

brute force, data structures, dp, implementation

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Team Rocket Rises Again

data structures, graphs, shortest paths

Felicity is Coming!

data structures, hashing, sortings, strings

Nikita and stack

data structures

PolandBall and Polygon

data structures

PolandBall and Game

binary search, data structures, games, greedy, sortings, strings

Fedor and coupons

binary search, data structures, greedy, sortings

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

New Year and Fireworks

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

Inversions After Shuffle

data structures, probabilities

Leaving Auction

binary search, data structures

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Music in Car

data structures, greedy, two pointers

Arpa’s abnormal DNA and Mehrdad’s deep interest

data structures, string suffix structures

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

data structures, dfs and similar, trees

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Alyona and towers

data structures

Alyona and a tree

binary search, data structures, dfs and similar, graphs, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Sleep in Class

constructive algorithms, data structures, math, two pointers

Kostya the Sculptor

data structures, hashing

Video Cards

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

80-th Level Archeology

brute force, data structures, greedy, sortings

Expression Queries

data structures

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Games on a CD

data structures, hashing, string suffix structures, strings

Contest Balloons

data structures, greedy

Dense Subsequence

data structures, greedy, strings

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Generating Sets

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

Destroying Array

data structures, dsu

Maxim and Array

constructive algorithms, data structures, greedy, math

Array Covering

data structures

Slalom

data structures, dp, sortings

Sasha and Array

data structures, math, matrices

Heroes of Making Magic III

data structures

Animals and Puzzle

binary search, data structures

Sonya and Queries

data structures, implementation

Memory and Casinos

data structures, math, probabilities

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

Centroids

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

Garlands

data structures

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Working routine

data structures, implementation

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Iron Man

data structures, geometry, trees

Thor

brute force, data structures, implementation

Mishka and Interesting sum

data structures

T-Shirts

data structures

Analysis of Pathes in Functional Graph

data structures, graphs

Powers of Two

brute force, data structures, implementation, math

Cells Not Under Attack

data structures, math

Huffman Coding on Segment

data structures, greedy

...Wait for it...

data structures, dsu, trees

Legen...

data structures, dp, matrices, strings

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

Recover Polygon (hard)

data structures

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Friends and Subsequences

binary search, data structures

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Kay and Snowflake

data structures, dfs and similar, dp, trees

Heap Operations

constructive algorithms, data structures, greedy

Bear and Bad Powers of 42

data structures

Lena and Queries

data structures, divide and conquer, geometry

Vanya and Treasure

data structures, dp, graphs, shortest paths

Trains and Statistic

data structures, dp, greedy

Tree Construction

data structures, trees

Money Transfers

constructive algorithms, data structures, greedy, sortings

Organizing a Race

data structures, greedy

Roads in Yusland

data structures, dp, greedy

Ultimate Weirdness of an Array

data structures, number theory

Correct Bracket Sequence Editor

data structures, dsu, strings

Forensic Examination

data structures, string suffix structures

Four Divisors

data structures, dp, math, number theory, sortings, two pointers

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

New Reform

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

Paper task

data structures, string suffix structures, strings

Nested Segments

data structures, sortings

Clockwork Bomb

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

Zip-line

binary search, data structures, dp, hashing

Watchmen

data structures, geometry, math

Автобус

binary search, data structures, greedy, sortings

Собачки и миски

data structures, greedy, sortings

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Processing Queries

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

Choosing Ads

data structures

Little Artem and Time Machine

data structures

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Bear and Contribution

data structures, greedy, sortings, two pointers

Running with Obstacles

*special problem, data structures, dp, greedy

Chat Order

*special problem, binary search, constructive algorithms, data structures, sortings