Ela Goes Hiking

combinatorics, dp, math, probabilities

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Points

combinatorics, data structures, implementation, math, matrices

Coloring

combinatorics, constructive algorithms, implementation, math

Smooth Sailing (Easy Version)

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

Tree Factory

constructive algorithms, greedy, trees

The Top Scorer

combinatorics, dp, math, probabilities

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Case of a Top Secret

binary search, implementation, math

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Christmas Game

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

DSU Master

combinatorics, dp, dsu, math

Ostap and Tree

dp, trees

Battle Lemmings

dp, greedy

Tree

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

Expected Square Beauty

dp, math, probabilities

Dasha and Chess

constructive algorithms, games, interactive

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Lena and Queries

data structures, divide and conquer, geometry

Balancing Weapons

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

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Balance

dp

Baby Ehab Plays with Permutations

combinatorics, dp, math

Contact ATC

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Tree Queries

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

Red-White Fence

combinatorics, fft

Hobbits

binary search, geometry

The Neutral Zone

brute force, math

Village (Maximum)

*special problem, dfs and similar, trees

Putting Boxes Together

data structures

Alphabet Permutations

data structures, strings

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Board Game

data structures, dfs and similar

Marbles

hashing, strings

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Zeros and Ones

bitmasks, divide and conquer, dp, math

Caterpillar on a Tree

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

Codeword

combinatorics, strings

Serval and Music Game

brute force, dp, implementation, math, number theory

Cowslip Collections

combinatorics, math, number theory

Library game

games, greedy, interactive, sortings

DZY Loves Strings

binary search, hashing, strings, two pointers

Nobody is needed

2-sat, data structures, dfs and similar, dp

Connecting Vertices

dp, graphs

Game

math

Smile House

binary search, graphs, matrices

Laboratory on Pluto

constructive algorithms, dp, greedy, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

Bear and Fair Set

flows, graphs

Misha and Palindrome Degree

binary search, combinatorics, implementation

More Queries to Array...

data structures, math

Map

data structures, implementation, sortings

Segments on the Line

binary search, dp

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Attack on Red Kingdom

games, two pointers

Geometers Anonymous Club

data structures, geometry, math, sortings

The Child and Polygon

dp, geometry

Maze

dfs and similar, dp, probabilities, trees

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Genetic engineering

dp, string suffix structures, trees

Even Split

binary search, constructive algorithms, greedy, math

Very simple problem

geometry, two pointers

Round Marriage

binary search, graph matchings, greedy

Binary Matrix

dsu

Degree Set

constructive algorithms, graphs, implementation

Power or XOR?

bitmasks, combinatorics, math, number theory

Hossam and a Letter

brute force, dp, implementation, two pointers

Function Sum

brute force, combinatorics, dp, fft, math

Number Table

combinatorics

Volcanoes

binary search, implementation, sortings, two pointers

Functions On The Segments

data structures

Almost Increasing Array

data structures, dp

Yaroslav and Points

data structures

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Recursive Queries

data structures

Spinach Pizza

games, geometry, greedy, interactive

Alice and the Unfair Game

binary search, data structures, dp, dsu

Inversion Composition

constructive algorithms, data structures, greedy

Inverse Transformation

constructive algorithms, implementation, math

Magic multisets

data structures

Summer Practice Report

dp, greedy

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

Italian Data Centers

graphs, shortest paths

Robot and Candies

data structures, graph matchings, greedy

Memory and Casinos

data structures, math, probabilities

Compute Power

binary search, dp, greedy

Tree

dp

Robot Arm

data structures, geometry

Igloo Skyscraper

data structures, geometry

Kingdom of Criticism

data structures, dsu

Rock-Paper-Scissors Champion

Minimal k-covering

flows, graphs

Vus the Cossack and a Field

divide and conquer, implementation, math