Cross Xor

constructive algorithms, graphs, math, matrices

Xor Spanning Tree

divide and conquer, fft, graphs

Bear and Chase

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

TOF

dfs and similar, graphs

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Hercule Poirot Problem

dsu, graphs

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Amanda the Amoeba

graphs, implementation, trees, two pointers

Beautiful Tree

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

The Game of the Century

constructive algorithms, graphs, shortest paths

Winning Strategy

binary search, graphs, math, shortest paths

Strange Permutation

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

European Trip

dp, graphs, math, matrices

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Squares

constructive algorithms, data structures, dp, graphs, trees

Maximum Flow

flows, graphs

Doe Graphs

constructive algorithms, divide and conquer, dp, graphs, shortest paths

Battlefield

geometry, graphs, implementation, shortest paths

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Cycle Palindrome

constructive algorithms, graphs, math

Jumping Through the Array

binary search, data structures, graphs, two pointers

Familiar Operations

brute force, graphs, math

Grocer's Problem

constructive algorithms, graphs, greedy

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

One Billion Shades of Grey

flows, graphs

Deputies

constructive algorithms, graphs, greedy, implementation

Swiper, no swiping!

graphs, implementation

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Football

graphs

Take Metro

brute force, data structures, graphs

Just Add an Edge

dfs and similar, dp, graphs

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

The Overdosing Ubiquity

brute force, dfs and similar, graphs

Island Puzzle

dfs and similar, dsu, graphs, trees

JYPnation

graphs

Palindromic Hamiltonian Path

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

Bimatching

graphs

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Tree

fft, graphs, trees

Evidence Board

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

Stock Exchange

binary search, flows, graphs

Cactus Not Enough

dfs and similar, graph matchings, graphs

Kevin and Grid

fft, graphs, math

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Training Camp

flows, graphs

Star Trek

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

Journey

data structures, divide and conquer, graphs, trees

Cactus to Tree

dp, graphs, trees

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Planar Graph

flows, geometry, graphs

Baldman and the military

dfs and similar, graphs, trees

Graph Coloring

data structures, graphs, interactive

Privatization

flows, graphs

The Meeting Place Cannot Be Changed

dfs and similar, graphs

Tree and Permutation Game

dfs and similar, games, graphs, trees

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Road Problem

graphs

Poachers

dp, games, graphs, trees

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Seollal

graphs

Deja Vu

constructive algorithms, graphs, implementation

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Projectors

flows, graphs

Restore the Tree

graphs, greedy, trees

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Knightmare (hard)

graphs, interactive, shortest paths

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Dušan's Railway

divide and conquer, graphs, trees

Planar Perimeter

constructive algorithms, graphs

Escaping on Beaveractor

graphs

Greedy Petya

*special problem, dfs and similar, graphs, greedy

Knightmare (easy)

graphs, interactive, shortest paths

Optimizer

graphs, greedy, hashing, implementation

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Hex Dyslexia

bitmasks, brute force, dp, graphs

Tanya is 5!

graph matchings, graphs, greedy, schedules

Desert

data structures, graphs

BubbleReactor

dp, graphs

Harder Satisfiability

2-sat, dfs and similar, graphs

Indefinite Clownfish

binary search, graphs

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Impressionism

constructive algorithms, graphs, implementation, math

Two Avenues

data structures, dfs and similar, graphs

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Distance Sum

graphs

Neighbour Ordering

constructive algorithms, graphs

Roads Orientation Problem

graphs

Linearization

graphs

Alpha planetary system

constructive algorithms, graphs, shortest paths

Biome Map

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

Doremy's Swapping Trees

dfs and similar, graphs, trees

Собери число

graphs, shortest paths

Future Dominators

graphs, greedy

Parallel Universes

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

Standard Graph Problem

data structures, graphs, greedy, trees

Chain Letter

*special problem, dfs and similar, graphs