Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Pairs of Paths

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

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Max Median

binary search, data structures, dp

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Move and Swap

dfs and similar, dp, greedy, trees

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Exam

data structures, string suffix structures, trees

Vabank

binary search, interactive

Useful Edges

graphs, shortest paths

Skyline Photo

data structures, divide and conquer, dp

AB Tree

dp, greedy, trees

Sorting Books

data structures, dp, greedy

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

School Clubs

dp, fft, math, number theory, probabilities

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Continuous City

bitmasks, constructive algorithms

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Nezzar and Tournaments

data structures, greedy

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Minimum Difference

data structures, hashing, sortings, two pointers

Lanterns

binary search, data structures, dp

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

1 2 3 4 ...

dp, math, matrices

What Is It?

constructive algorithms, greedy

Cleaning

data structures, dp, greedy, math

Tiles

combinatorics, dp, fft, math

Strange Set

flows, math

Minimum Path

graphs, shortest paths

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Strange Covering

divide and conquer

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

Power Sockets

binary search, data structures, greedy

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Similar Sets

data structures, graphs, implementation

Prime Divisors Selection

binary search, greedy, math, number theory

Plane Tiling

geometry, implementation, math

K and Medians

constructive algorithms, greedy, math

Hobbits

binary search, geometry

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

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

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

Mathematical Expression

constructive algorithms, dp, greedy

Water Level

brute force, graphs, greedy, implementation, math

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

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

Array Partition

binary search, data structures, greedy, two pointers

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Even Harder

dp

Dog Snacks

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

Game On Tree

data structures, dfs and similar, greedy, trees

Divide Powers

constructive algorithms, greedy

Two Editorials

brute force, dp, greedy, sortings, two pointers

Nullify The Matrix

constructive algorithms, games

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, 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

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Errich-Tac-Toe (Easy Version)

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

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

Long Permutation

brute force, math, two pointers

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

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