Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Ann and Books

data structures, flows, hashing

Fairy

dfs and similar, divide and conquer, dsu

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Charming Meals

binary search, brute force, greedy, sortings

Frequency Problem (Easy Version)

data structures, greedy

(Zero XOR Subset)-less

math, matrices

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Egor in the Republic of Dagestan

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

Tournament

brute force, dp, greedy

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Add Points

Sorting Pancakes

dp

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Flawed Flow

constructive algorithms, flows, graphs, greedy

Mushroom Scientists

math, ternary search

Special Matrices

combinatorics, dp

Triangles

combinatorics, graphs, math

Event Dates

greedy, meet-in-the-middle, sortings

Helping Hiasat

bitmasks, brute force, dp, meet-in-the-middle

Build String

flows, graphs

Biathlon

binary search, implementation

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Vanya and Field

math

Nastya and a Game

brute force, implementation, math

Beard Graph

data structures, dsu, trees

Lightsabers (easy)

implementation

Chris and Road

geometry, implementation

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

Presents in Bankopolis

dp, graphs, shortest paths

Sockets

greedy, sortings

Pie or die

games

Hot Days

greedy

Letters Removing

data structures, strings

Lizard Era: Beginning

meet-in-the-middle

Commentator problem

geometry

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

Draw Brackets!

*special problem, implementation

EKG

dfs and similar, dp

Inversion Expectation

dp, math, probabilities

Palindromic Cut

brute force, implementation, strings

Educational Game

greedy

LaIS

data structures, dp, greedy

Jamie and Tree

data structures, trees

Square-free division (hard version)

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

Ant Man

dp, graphs, greedy

Turtles

dp, matrices

Tree Destruction

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

Yet Another Segments Subset

data structures, dp, graphs, sortings

Animal Observation (easy version)

data structures, dp

Daleks' Invasion (easy)

graphs, trees

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Poman Numbers

bitmasks, greedy, math, strings

Bubble Strike

combinatorics, math, probabilities, ternary search

Scalar Queries

combinatorics, data structures, math, sortings

Toda 2

greedy, implementation

Treeland Tour

data structures, dfs and similar, dp, trees

Educational Game

Deleting Numbers

interactive, math, number theory

Username

*special problem, implementation

Little Girl and Problem on Trees

data structures, graphs, trees

Sum

greedy, math

Bored Bakry

bitmasks, greedy, math, two pointers

Wires

dfs and similar, graphs, greedy

Ants

brute force, implementation

Intersecting Subtrees

dfs and similar, interactive, trees

Scheme

dfs and similar, graphs, trees

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Cactus

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

Very Interesting Game

brute force, number theory

Naughty Stone Piles

greedy

Prefix Enlightenment

dfs and similar, dsu, graphs

Unique Occurrences

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

Cubes

games, greedy, implementation

Arthur and Brackets

dp, greedy

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Crypto Lights

combinatorics, dp, math, probabilities

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Monsters (hard version)

data structures, greedy

AI robots

data structures

Reverse and Swap

binary search, bitmasks, data structures

Vanya and Treasure

data structures, dp, graphs, shortest paths

Hyperregular Bracket Strings

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

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

On Changing Tree

data structures, graphs, trees

e-Government

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

Happy Sets

combinatorics

Changing a String

dp

Black and White Tree

dfs and similar, greedy, trees

Olya and magical square

constructive algorithms, implementation, math