Matrix

data structures

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

Sequence Transformation

brute force, data structures, dp, implementation, math

Landmarks

data structures, dp

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Mirror Room

data structures, implementation

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Blog Post Rating

data structures, sortings

Find String in a Grid

data structures, dp, strings, trees

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Mystic Carvings

data structures

Equal Product

data structures, math, number theory, two pointers

Banners

brute force, data structures, dp

Tower Defense

binary search, brute force, data structures

A Stroll Around the Matrix

data structures, greedy, math

Berland Miners

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

Colorful Tree Again

brute force, data structures, trees

Roadside Trees

data structures, dp

Omkar and Time Travel

data structures, math

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

The Awesomest Vertex

data structures, dfs and similar

Edge Queries

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

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Bear and Cavalry

data structures, divide and conquer, dp

LuoTianyi and the Function

data structures

Array Game

data structures, games

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

...Wait for it...

data structures, dsu, trees

Julia the snail

data structures, divide and conquer, dp

Longest Increasing Subsequence

data structures, dp

Lanterns

binary search, data structures, dp

Ping-Pong

data structures

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Treeland and Viruses

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

Freezing with Style

binary search, data structures, divide and conquer, trees

Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Indecisive Taxi Fee

data structures, graphs, shortest paths

Duff is Mad

data structures, strings

Good Subsegments

data structures

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

Frequency Problem (Hard Version)

data structures, greedy, two pointers

The Classic Problem

data structures, graphs, shortest paths

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Gosha is hunting

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

Pudding Monsters

data structures, divide and conquer

Heaven Tour

data structures, greedy

Mixture

*special problem, data structures, geometry, math, sortings

Late For Work (submissions are not allowed)

data structures, greedy, schedules, shortest paths

Mahmoud and Ehab and the final stage

data structures, strings

Two Rooted Trees

data structures, implementation, trees

Bakery

data structures, dsu

Digital Patterns

combinatorics, data structures, implementation, math

Pebbles and Beads

data structures, geometry

Meta-universe

data structures

Take Metro

brute force, data structures, graphs

Lucky Pair

combinatorics, data structures, implementation

Tape Programming

data structures, implementation

Evaluate RBS

data structures, geometry, implementation, math, sortings

Tree or not Tree

data structures, divide and conquer, implementation, trees

New task

data structures

RC Kaboom Show

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

Snowy Mountain

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

May Holidays

data structures, trees

Distinctification

data structures, dsu, greedy

Two Segments

data structures

Forbidden Value

data structures, dp

Coins Exhibition

data structures, dp, math

Tiles for Bathroom

data structures, sortings, two pointers

Noble Knight's Path

data structures, trees

Fence

binary search, data structures, string suffix structures

Phys Ed Online

data structures, dp, greedy

Timofey and our friends animals

data structures, divide and conquer, dsu

Tokitsukaze and Beautiful Subsegments

data structures

Beautiful Matrix

combinatorics, data structures, dp

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Cute number

binary search, brute force, data structures, dsu, implementation, math

Function

data structures

Duff as a Queen

data structures

Hitchhiking in the Baltic States

data structures, dp

April Fools' Problem (hard)

binary search, data structures, flows

Max Mex

data structures, trees

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Isolation

data structures, dp

Odd Mineral Resource

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

Roads in Yusland

data structures, dp, greedy

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

data structures, dfs and similar, trees

Build From Suffixes

*special problem, combinatorics, data structures

Visible Black Areas

data structures, dsu, geometry, trees

Sequence Recovery

bitmasks, data structures, greedy

Impressive Harvesting of The Orchard

data structures

Sasha and a Patient Friend

binary search, data structures, implementation

Local Deletions

binary search, data structures, implementation

Palindromic Problem

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

Alien DNA

data structures, dsu, trees

Perfect Matching

data structures, divide and conquer, interactive, trees

Beautiful Tree

data structures, dfs and similar, graphs, implementation, trees

Building Forest Trails

data structures, dsu