Smooth Sailing (Hard Version)

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

Reindeer Games

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

The Game of the Century

constructive algorithms, graphs, shortest paths

Maximum Flow

flows, graphs

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Palindromic Hamiltonian Path

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

Wizards and Roads

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

Planar Graph

flows, geometry, graphs

Privatization

flows, graphs

Tree and Permutation Game

dfs and similar, games, graphs, trees

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Knightmare (hard)

graphs, interactive, shortest paths

Alpha planetary system

constructive algorithms, graphs, shortest paths

Spider

geometry, graphs

Gnomes of Might and Magic

data structures, graphs, implementation, shortest paths

Nastya and Bees

graphs, interactive, probabilities

Unusual Graph

*special problem, graphs

Flip and Reverse

data structures, graphs, greedy

Cycling City

dfs and similar, graphs

String Transformation 2

bitmasks, dp, graphs, trees

Cow and Exercise

flows, graphs, shortest paths

Good Colorings

binary search, constructive algorithms, graphs, interactive

Four Vertices

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

Perpetual Motion Machine

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

Football

graphs

Graph Coloring

data structures, graphs, interactive

Projectors

flows, graphs

Distance Sum

graphs

Tourists

data structures, dfs and similar, graphs, trees

ALT

data structures, flows, graphs, trees

New Year and Forgotten Tree

constructive algorithms, flows, graphs

Kyoya and Train

dp, fft, graphs, math, probabilities

Invertation in Tournament

brute force, divide and conquer, graphs, math

Pink Floyd

graphs, interactive

Election Promises

games, graphs

Shifting Dominoes

data structures, geometry, graphs, 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

Teleportation in Byteland

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

Special Edges

flows, graphs

Cross Xor

constructive algorithms, graphs, math, matrices

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Strange Permutation

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

Cycle Palindrome

constructive algorithms, graphs, math

Bimatching

graphs

Planar Perimeter

constructive algorithms, graphs

Roads Orientation Problem

graphs

Public Service

constructive algorithms, graphs, trees

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Starry Night Camping

constructive algorithms, flows, graphs

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Matvey's Birthday

bitmasks, graphs

DIY Tree

graphs, greedy, math, probabilities

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Squares

constructive algorithms, data structures, dp, graphs, trees

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

One Billion Shades of Grey

flows, graphs

Kevin and Grid

fft, graphs, math

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Seollal

graphs

Hex Dyslexia

bitmasks, brute force, dp, graphs

Tanya is 5!

graph matchings, graphs, greedy, schedules

Dynamic Shortest Path

graphs, shortest paths

Making It Bipartite

flows, graph matchings, graphs, number theory

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Complete the Permutations

combinatorics, fft, graphs, math

Gregor and the Two Painters

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

Swiper, no swiping!

graphs, implementation

Island Puzzle

dfs and similar, dsu, graphs, trees

Tree

fft, graphs, trees

Fake bullions

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

Harder Satisfiability

2-sat, dfs and similar, graphs

Red-Blue Graph

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

Railway Construction

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

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Jumping Through the Array

binary search, data structures, graphs, two pointers

Just Add an Edge

dfs and similar, dp, graphs

JYPnation

graphs

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Stock Exchange

binary search, flows, graphs

Journey

data structures, divide and conquer, graphs, trees

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Lost Nodes

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

Good Graph

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

Balance the Cards

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

Dušan's Railway

divide and conquer, graphs, trees

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

Neighbour Ordering

constructive algorithms, graphs

Doremy's Swapping Trees

dfs and similar, graphs, trees

Future Dominators

graphs, greedy

Standard Graph Problem

data structures, graphs, greedy, trees