Middle Duplication

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

Animals and Puzzle

binary search, data structures

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Permutation and Queries

brute force, data structures, divide and conquer, two pointers

Controversial Rounds

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

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Team Rocket Rises Again

data structures, graphs, shortest paths

Range Increments

data structures, greedy

Best Edge Weight

data structures, dfs and similar, graphs, trees

Traffic Jams in the Land

data structures, dp, number theory

New Passenger Trams

binary search, brute force, data structures, sortings, two pointers

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Nastya Hasn't Written a Legend

binary search, data structures

Maximum Questions

data structures, dp, strings

Teams Formation

data structures, implementation

Inversions After Shuffle

data structures, probabilities

Three strings

data structures, dsu, string suffix structures, strings

Little Elephant and Tree

data structures, dfs and similar, trees

House Planning

constructive algorithms, data structures, graph matchings, greedy

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Archaeology

data structures, dfs and similar, trees

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Frequency Queries

data structures, dfs and similar, trees

Jeff and Removing Periods

data structures

Dog Show

constructive algorithms, data structures, greedy

Heidi and Library (medium)

data structures, greedy

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Rollbacks (Hard Version)

data structures, interactive, trees

Garlands

data structures

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

Petya and File System

data structures, implementation

Fenwick Tree

brute force, combinatorics, data structures, dp, math, matrices, trees

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Il Derby della Madonnina

data structures, dp, math

Duff is Mad

data structures, strings

Vasya and Maximum Profit

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

Zebra Tower

*special problem, data structures, greedy, sortings

Closest Pair

data structures, greedy

New Year and the Acquaintance Estimation

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

Security

data structures, string suffix structures

Choose a Square

binary search, data structures, sortings

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Flip and Reverse

data structures, graphs, greedy

Boring Queries

data structures, math, number theory

Deduction Queries

data structures, dsu

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Antennas

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

Greedy Subsequences

data structures, dp, trees

Embassy Queue

data structures, greedy

Parking Lot

data structures, implementation

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Adam and Tree

data structures, trees

Professor's task

data structures, geometry

Paper task

data structures, string suffix structures, strings

Death DBMS

data structures, string suffix structures, strings, trees

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Bicolored Segments

data structures, dp, graph matchings, sortings

Group Photo

binary search, data structures, implementation, two pointers

Optimize!

data structures

Isolation

data structures, dp

Field Photography

bitmasks, data structures, sortings

Inna and Binary Logic

binary search, bitmasks, data structures

Maximum Reduction

combinatorics, data structures, math

Maximize The Value

data structures, sortings

Velepin and Marketing

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

Points Movement

data structures, dp, greedy, implementation, sortings

Game with Cards

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

Top-Notch Insertions

combinatorics, data structures

Little Elephant and Shifts

data structures

Comb

data structures, dp

Zigu Zagu

constructive algorithms, data structures, greedy

Aquarium decoration

data structures, greedy, two pointers

Choosing Ads

data structures

Narrow Components

brute force, data structures, dp, dsu, math, trees

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Merge Equal Elements

constructive algorithms, data structures

Eyes Closed

data structures, probabilities

Hostname Aliases

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

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Similar Sets

data structures, graphs, implementation

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Chemistry Experiment

binary search, data structures, ternary search

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Fools and Foolproof Roads

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

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Tournament

data structures, graphs

Doremy's Drying Plan (Hard Version)

data structures, dp

Points

combinatorics, data structures, implementation, math, matrices

Sereja and Two Sequences

data structures, dp

Students' Revenge

data structures, greedy, sortings

Cutlet

data structures, dp

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

NN country

binary search, data structures, trees