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

Number Deletion Game

*special problem, dp, games, greedy

Neural Network Problem

*special problem, binary search, greedy

Chess Match

*special problem

Used Markers

*special problem, greedy

Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers

Selling Hamburgers

*special problem

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Realistic Gameplay

dp, greedy

String Reversal

data structures, greedy, strings

String Deletion

binary search, data structures, greedy, two pointers

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Barrels

greedy, implementation, sortings

Number of Apartments

brute force, constructive algorithms, math

Rotary Laser Lock

binary search, interactive

Lucky Numbers (Hard Version)

dp, greedy

Lucky Numbers (Easy Version)

dp, greedy

Fruit Sequences

binary search, data structures, divide and conquer, dp, two pointers

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Bouncing Boomerangs

constructive algorithms, greedy, implementation

ABBB

brute force, data structures, greedy, strings

Belted Rooms

graphs, implementation

Box is Pull

math

Prison Break

binary search, games, geometry, ternary search

One Billion Shades of Grey

flows, graphs

Boring Card Game

data structures, greedy, trees

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Unshuffling a Deck

constructive algorithms, implementation

The Hard Work of Paparazzi

dp

Chess Cheater

greedy, implementation, sortings

Avoiding Zero

math, sortings

Number of Subsequences

combinatorics, dp, strings

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Increase and Copy

binary search, constructive algorithms, math

Symmetric Matrix

implementation

Floor Number

implementation, math

Impressive Harvesting of The Orchard

data structures

Huge Boxes of Animal Toys

constructive algorithms

Flamingoes of Mystery

interactive

Excitation of Atoms

greedy, implementation

Danger of Mad Snakes

combinatorics, dp, math