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

Catching Cheaters

dp, strings

Knapsack

constructive algorithms, greedy, sortings

Elimination

greedy, math

Array Rearrangment

greedy, sortings

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Rectangular Polyline

constructive algorithms, dp, geometry

Team-Building

data structures, dfs and similar, dsu, graphs

Divide and Sum

combinatorics, math, sortings

Division

brute force, math, number theory

Long Permutation

brute force, math, two pointers

The Delivery Dilemma

binary search, greedy, sortings

Saving the City

dp, greedy, math, sortings

Kids Seating

constructive algorithms, math

Differentiating Games

games, interactive

Black, White and Grey Tree

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

Sum

data structures, divide and conquer, dp, greedy

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Extreme Subtraction

constructive algorithms, dp, greedy

Sum of Medians

greedy, math

Buy the String

implementation, math

Cheat and Win

bitmasks, data structures, games, trees

INOI Final Contests

combinatorics, dp, fft

Greedy Shopping

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

Graph Subset Problem

constructive algorithms, data structures, graphs

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Binary Table (Easy Version)

constructive algorithms, implementation

Olha and Igor

interactive, probabilities, trees

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Powerful Ksenia

bitmasks, constructive algorithms, math

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

Specific Tastes of Andre

constructive algorithms, implementation

Death DBMS

data structures, string suffix structures, strings, trees

Emotional Fishermen

combinatorics, dp, math, two pointers

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Minimal Height Tree

graphs, greedy, shortest paths, trees

Chef Monocarp

dp, flows, graph matchings, greedy, math, sortings

Reverse Binary Strings

constructive algorithms, greedy

Marketing Scheme

brute force, constructive algorithms, greedy, math

Sum Over Subsets

combinatorics, math, number theory

Complicated Computations

binary search, data structures, two pointers

Bandit in a City

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

Binary Search

binary search, combinatorics

Prime Square

constructive algorithms, math

Reorder

math

A Convex Game

dsu, games

Reducing Delivery Cost

brute force, graphs, shortest paths

Zero Remainder Sum

dp

Two Round Dances

combinatorics, math

Districts Connection

constructive algorithms, dfs and similar

Dominant Piranha

constructive algorithms, greedy

Yet Another Bookshelf

greedy, implementation

Boring Apartments

implementation, math

Zero-XOR Array

*special problem, dp

Cyclic Shifts

*special problem, strings

Rogue-like Game

*special problem, brute force, greedy, two pointers