Hobbits

binary search, geometry

Full Turn

geometry, hashing, number theory

Four Segments

greedy

Firecrackers

binary search, sortings

Berpizza

data structures, implementation

Bakery

data structures, dsu

LaIS

data structures, dp, greedy

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Sum of Paths

combinatorics, dp, math

Three Bags

constructive algorithms, greedy

Hills And Valleys

brute force, implementation

Wizard of Orz

constructive algorithms, greedy, math

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Apollo versus Pan

bitmasks, brute force, math

13th Labour of Heracles

data structures, greedy, sortings, trees

Canine poetry

dp, greedy, strings

Last minute enhancements

dp, greedy

Bovine Dilemma

brute force, geometry, math

My Beautiful Madness

data structures, trees

Max Correct Set

bitmasks, dp, math

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Pairs

binary search, constructive algorithms, greedy, two pointers

Busy Robot

implementation

Find The Array

bitmasks, constructive algorithms, greedy

Dungeon

binary search, math

The Treasure of The Segments

binary search, data structures, greedy

Close Tuples (hard version)

binary search, combinatorics, implementation, math, sortings, two pointers

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Add to Neighbour and Remove

greedy, math, number theory

Unique Number

brute force, greedy, math

Last Year's Substring

dp, implementation, strings

Favorite Sequence

implementation, two pointers

Mathematical Expression

constructive algorithms, dp, greedy

Water Level

brute force, graphs, greedy, implementation, math

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Random Events

dp, math, probabilities

Find the Spruce

brute force, dp, implementation

String Generation

constructive algorithms, greedy

Move and Turn

dp, math

Red-Blue Shuffle

math, probabilities

Range Diameter Sum

data structures, trees

Nim Shortcuts

data structures, games

Flip and Reverse

data structures, graphs, greedy

Latin Square

math, matrices

Glass Half Spilled

dp

Row GCD

math, number theory

XOR-ranges

dp, greedy

Forbidden Value

data structures, dp

String and Operations

dp, greedy

Four Points

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

Sequence and Swaps

dp, greedy, sortings

Ping-pong

constructive algorithms, games, math

Jumps

constructive algorithms, math

Strange Functions

math, number theory

Array Partition

binary search, data structures, greedy, two pointers

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Number into Sequence

constructive algorithms, math, number theory

Sequence Transformation

greedy, implementation

Unique Bid Auction

implementation

Special Permutation

constructive algorithms, probabilities

Even Harder

dp

Dog Snacks

binary search, dfs and similar, dp, greedy, trees

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Triangles

greedy, implementation

Suffix Operations

constructive algorithms, implementation

Cancel the Trains

implementation

Game On Tree

data structures, dfs and similar, greedy, trees

Divide Powers

constructive algorithms, greedy

Two Editorials

brute force, dp, greedy, sortings, two pointers

Radio Towers

combinatorics, dp, math

Two Brackets

greedy

Toy Blocks

binary search, greedy, math, sortings

Robot Program

math

Nullify The Matrix

constructive algorithms, games

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Circle Game

games, geometry, math

String Equality

dp, greedy, hashing, implementation, strings

Non-Substring Subsequence

dp, greedy, implementation, strings

Subtract or Divide

greedy, math

Multithreading (Hard Version)

combinatorics, implementation, math

Multithreading (Easy Version)

combinatorics, fft, math

Communism

bitmasks, dp, trees

The Struggling Contestant

constructive algorithms, greedy

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Rating Compression

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

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Balls of Steel

brute force, geometry, greedy

Avoid Trygub

constructive algorithms, sortings

Numbers Box

greedy, math

Add Candies

constructive algorithms, math

Line Distance

binary search, data structures, geometry

Long Recovery

constructive algorithms, dfs and similar

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Frequency Problem (Easy Version)

data structures, greedy

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees