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

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