Tree Destruction

constructive algorithms, dfs and similar, graphs, greedy, trees

Bored Bakry

bitmasks, greedy, math, two pointers

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Tonya and Burenka-179

data structures, greedy, math, number theory

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

Black and White Tree

dfs and similar, greedy, trees

Flipping Range

constructive algorithms, dp, greedy, number theory

Ina of the Mountain

data structures, dp, greedy, math

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Flying Sort (Hard Version)

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

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Ehab and a component choosing problem

dp, greedy, math, trees

DFS Trees

dfs and similar, dsu, graphs, greedy, sortings, trees

New Year and Rainbow Roads

graphs, greedy, implementation

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Split the Tree

binary search, data structures, dp, greedy, trees

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Animal Observation (hard version)

data structures, dp, greedy

The Struggling Contestant

constructive algorithms, greedy

Running in Pairs

constructive algorithms, greedy, math

Leaf Sets

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

Restore the Permutation by Sorted Segments

brute force, constructive algorithms, data structures, greedy, implementation

XOR Break --- Game Version

bitmasks, games, greedy, interactive

Doremy's Number Line

dp, greedy, sortings

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Decreasing Game

constructive algorithms, dfs and similar, dp, greedy, interactive

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Dog Walking

brute force, greedy, math

Pokémon Arena

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

Labyrinth

binary search, dsu, greedy

Blocking Chips

binary search, constructive algorithms, dfs and similar, greedy, trees

House Planning

constructive algorithms, data structures, graph matchings, greedy

Labeling the Tree with Distances

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

Sonya and Ice Cream

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

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

New Year and the Acquaintance Estimation

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

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Change-free

greedy

Population Size

greedy, implementation, math

Flow Control

dfs and similar, dp, greedy, trees

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

New Year and Three Musketeers

data structures, greedy, sortings

Bear and Contribution

data structures, greedy, sortings, two pointers

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Tanks

dp, greedy, implementation

Michael and Charging Stations

binary search, dp, greedy

Divisibility

constructive algorithms, dp, greedy, number theory

Refactoring

greedy, implementation, strings

Renovation

constructive algorithms, greedy, sortings

Hamming Distance

constructive algorithms, greedy, math, matrices

Berkomnadzor

data structures, greedy

Track

graphs, greedy, shortest paths

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Binary Key

dp, greedy, implementation

Interval Coloring

*special problem, greedy, math

Inversion SwapSort

constructive algorithms, greedy, sortings

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Ivan and Burgers

data structures, divide and conquer, greedy, math

Sorting Books

data structures, dp, greedy

Ski Accidents

constructive algorithms, graphs, greedy

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Towers

constructive algorithms, dfs and similar, dp, greedy, trees

Artem and Array

data structures, greedy

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Square-free division (hard version)

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

Ant Man

dp, graphs, greedy

Two Editorials

brute force, dp, greedy, sortings, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Sanae and Giant Robot

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

Rescue Niwen!

dp, greedy, string suffix structures, strings

What Is It?

constructive algorithms, greedy

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

LuoTianyi and XOR-Tree

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

Royal Questions

dsu, graphs, greedy

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Move and Swap

dfs and similar, dp, greedy, trees

Frogs and mosquitoes

data structures, greedy

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Strange Function

binary search, data structures, dp, greedy

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Middle Duplication

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

Controversial Rounds

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

Text Editor

brute force, dp, greedy, strings

Colored Balls

greedy, math, number theory

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Madoka and the Sixth-graders

data structures, dfs and similar, greedy