Standard Graph Problem

data structures, graphs, greedy, trees

Future Dominators

graphs, greedy

Doremy's Swapping Trees

dfs and similar, graphs, trees

Neighbour Ordering

constructive algorithms, graphs

Two Avenues

data structures, dfs and similar, graphs

Arranging Crystal Balls

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

Impressionism

constructive algorithms, graphs, implementation, math

Indefinite Clownfish

binary search, graphs

Dušan's Railway

divide and conquer, graphs, trees

Balance the Cards

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

Lost Nodes

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

Good Graph

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

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Journey

data structures, divide and conquer, graphs, trees

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Stock Exchange

binary search, flows, graphs

JYPnation

graphs

Just Add an Edge

dfs and similar, dp, graphs

Jumping Through the Array

binary search, data structures, graphs, two pointers

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Red-Blue Graph

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

Harder Satisfiability

2-sat, dfs and similar, graphs

Fake bullions

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

Tree

fft, graphs, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Swiper, no swiping!

graphs, implementation

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

Complete the Permutations

combinatorics, fft, graphs, math

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Making It Bipartite

flows, graph matchings, graphs, number theory

Dynamic Shortest Path

graphs, shortest paths

Hex Dyslexia

bitmasks, brute force, dp, graphs

Tanya is 5!

graph matchings, graphs, greedy, schedules

Seollal

graphs

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Kevin and Grid

fft, graphs, math

One Billion Shades of Grey

flows, graphs

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Squares

constructive algorithms, data structures, dp, graphs, trees

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

DIY Tree

graphs, greedy, math, probabilities

Matvey's Birthday

bitmasks, graphs

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Starry Night Camping

constructive algorithms, flows, graphs

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Public Service

constructive algorithms, graphs, trees

Roads Orientation Problem

graphs

Planar Perimeter

constructive algorithms, graphs

Bimatching

graphs

Cycle Palindrome

constructive algorithms, graphs, math

Strange Permutation

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

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Cross Xor

constructive algorithms, graphs, math, matrices

Special Edges

flows, graphs

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Shifting Dominoes

data structures, geometry, graphs, trees

Election Promises

games, graphs

Invertation in Tournament

brute force, divide and conquer, graphs, math

Pink Floyd

graphs, interactive

Kyoya and Train

dp, fft, graphs, math, probabilities

New Year and Forgotten Tree

constructive algorithms, flows, graphs

ALT

data structures, flows, graphs, trees

Tourists

data structures, dfs and similar, graphs, trees

Equal Trees

*special problem, graphs, meet-in-the-middle

Distance Sum

graphs

Projectors

flows, graphs

Graph Coloring

data structures, graphs, interactive

Football

graphs

Perpetual Motion Machine

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

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Good Colorings

binary search, constructive algorithms, graphs, interactive

Cow and Exercise

flows, graphs, shortest paths

String Transformation 2

bitmasks, dp, graphs, trees

Cycling City

dfs and similar, graphs

Flip and Reverse

data structures, graphs, greedy

Unusual Graph

*special problem, graphs

Nastya and Bees

graphs, interactive, probabilities

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Spider

geometry, graphs

Alpha planetary system

constructive algorithms, graphs, shortest paths

Knightmare (hard)

graphs, interactive, shortest paths

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Tree and Permutation Game

dfs and similar, games, graphs, trees

Privatization

flows, graphs

Planar Graph

flows, geometry, graphs

Wizards and Roads

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

Palindromic Hamiltonian Path

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

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Maximum Flow

flows, graphs

The Game of the Century

constructive algorithms, graphs, shortest paths

Reindeer Games

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

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Edge Queries

data structures, dfs and similar, dp, dsu, graphs, trees