Chaotic V.

dp, graphs, greedy, math, number theory, trees

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Numbers on Tree

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

Seollal

graphs

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Christmas Trees

graphs, greedy, shortest paths

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Invertation in Tournament

brute force, divide and conquer, graphs, math

Segment Tree

data structures, dsu, graphs, trees

Red-Blue Graph

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

Almost Same Distance

dfs and similar, graphs

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Foolprüf Security

graphs

Economic Difficulties

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

Secret Passwords

dfs and similar, dsu, graphs

Fridge Lockers

graphs, implementation

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Harmonious Graph

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

Planar Perimeter

constructive algorithms, graphs

Sum Balance

bitmasks, dfs and similar, dp, graphs

0-1 MST

dfs and similar, dsu, graphs, sortings

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Wires

dfs and similar, graphs, greedy

Projectors

flows, graphs

The Coronation

graphs, implementation

Road Construction

flows, graphs

Swiper, no swiping!

graphs, implementation

Catowice City

2-sat, dfs and similar, graph matchings, graphs

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

The Maximum Subtree

dfs and similar, dp, graphs, trees

Football

graphs

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Konrad and Company Evaluation

graphs

Anadi and Domino

brute force, graphs

Tourism

dfs and similar, dp, dsu, graphs, greedy, trees

Alpha planetary system

constructive algorithms, graphs, shortest paths

Xor Spanning Tree

divide and conquer, fft, graphs

BubbleReactor

dp, graphs

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Cow and Snacks

dfs and similar, dsu, graphs

Unusual Graph

*special problem, graphs

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Coloring Edges

constructive algorithms, dfs and similar, graphs

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Knightmare (hard)

graphs, interactive, shortest paths

Knightmare (easy)

graphs, interactive, shortest paths

Rectangle Painting 2

flows, graph matchings, graphs

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Stock Exchange

binary search, flows, graphs

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Daleks' Invasion (easy)

graphs, trees

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Gang Up

flows, graphs

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Graph Decomposition

*special problem, graphs

Pairs

graphs, implementation

Vicky's Delivery Service

data structures, dsu, graphs, hashing

News Distribution

dfs and similar, dsu, graphs

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Indecisive Taxi Fee

data structures, graphs, shortest paths

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Palindrome XOR

dfs and similar, graphs

Hide and Seek

graphs

Optimizer

graphs, greedy, hashing, implementation

Election Promises

games, graphs

Abandoning Roads

brute force, dp, graphs, greedy

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Delivery Oligopoly

brute force, dp, graphs

Zoning Restrictions

dp, flows, graphs

Tree Diameter

bitmasks, graphs, interactive

Graph Without Long Directed Paths

dfs and similar, graphs

Pink Floyd

graphs, interactive

Maximize Mex

flows, graph matchings, graphs

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Privatization of Roads in Treeland

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

Museums Tour

dp, graphs, implementation

Spanning Tree with One Fixed Degree

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

Spanning Tree with Maximum Degree

graphs

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Tree

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

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings