Just Kingdom

brute force, data structures, dfs and similar

Divisible by Twenty-Five

brute force, dfs and similar, dp

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Palindromic Hamiltonian Path

brute force, dfs and similar, dp, graphs, hashing

One-Four Overload

2-sat, constructive algorithms, dfs and similar, dsu, graphs, implementation

Buds Re-hanging

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

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

You

dfs and similar, dp, math, number theory

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Organizing a Music Festival

dfs and similar, math

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Equidistant Vertices

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

Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation

How Many Paths?

dfs and similar, dp, graphs, trees

Need for Pink Slips

bitmasks, brute force, dfs and similar, implementation, math, probabilities

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Playoff Tournament

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

Falling Sand (Hard Version)

dfs and similar, dp, graphs, greedy

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

Excursions

*special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs

Biome Map

*special problem, constructive algorithms, dfs and similar, graphs

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Chests and Keys

bitmasks, brute force, dfs and similar, dp, flows

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Phoenix and Earthquake

constructive algorithms, dfs and similar, dsu, graphs, greedy, trees

Cactus Not Enough

dfs and similar, graph matchings, graphs

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Delete The Edges

brute force, constructive algorithms, dfs and similar, graphs, implementation

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Permutation Transformation

dfs and similar, divide and conquer, implementation

Minimum Ties

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation, math

Pairs of Paths

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

Move and Swap

dfs and similar, dp, greedy, trees

Nezzar and Hidden Permutations

constructive algorithms, dfs and similar, graphs

Pattern Matching

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

Journey

dfs and similar, dp, dsu, implementation

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Strange Housing

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

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Euclid's nightmare

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

Plan of Lectures

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

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Dog Snacks

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

Game On Tree

data structures, dfs and similar, greedy, trees

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Long Recovery

constructive algorithms, dfs and similar

Finding the Vertex

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

Team-Building

data structures, dfs and similar, dsu, graphs

Black, White and Grey Tree

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

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Bandit in a City

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

Districts Connection

constructive algorithms, dfs and similar

Yet Another DAG Problem

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

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Peaceful Rooks

dfs and similar, dsu, graphs

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Tree Tag

dfs and similar, dp, games, trees

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Distance Matching

constructive algorithms, dfs and similar, trees

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

Pairs of Pairs

constructive algorithms, dfs and similar, graphs, greedy, trees

Directing Edges

dfs and similar, dp, graphs, trees

Captain Flint and Treasure

data structures, dfs and similar, graphs, greedy, implementation, trees

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

Village (Maximum)

*special problem, dfs and similar, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

Directing Edges

constructive algorithms, dfs and similar, graphs

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

The Hidden Pair (Hard Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees