New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Island Puzzle

dfs and similar, dsu, graphs, trees

Iqea

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

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Cow and Vacation

dfs and similar, dsu, trees

Clockwork Bomb

data structures, dfs and similar, dsu, greedy, trees

Cycle sort

dsu, math

Campus

binary search, data structures, dsu, trees

Welcome home, Chtholly

data structures, dsu

...Wait for it...

data structures, dsu, trees

Pastoral Oddities

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

Distinctification

data structures, dsu, greedy

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Reclamation

dsu

Timofey and our friends animals

data structures, divide and conquer, dsu

Fairy

dfs and similar, divide and conquer, dsu

Visible Black Areas

data structures, dsu, geometry, trees

Alien DNA

data structures, dsu, trees

Appleman and Complicated Task

dsu, math

Number of Components

dsu, implementation

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Drazil and Morning Exercise

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

MUH and Lots and Lots of Segments

data structures, dsu

Entertaining Geodetics

brute force, dsu, implementation

Pairs

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

DZY Loves Planting

binary search, dsu, trees

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Holes

data structures, dsu

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Forced Online Queries Problem

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

Two Paths

constructive algorithms, dsu, graphs, implementation

Extending Set of Points

data structures, divide and conquer, dsu

Opening Portals

dsu, graphs, shortest paths

Vladik and Entertaining Flags

data structures, dsu, graphs

Guard Towers

binary search, dsu, geometry, graphs, sortings

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Savior

brute force, dsu, math

Cutting a Fence

binary search, data structures, dsu

Bipartite Checking

data structures, dsu, graphs

Binary Matrix

dsu

Alice and the Unfair Game

binary search, data structures, dp, dsu

Power Tree

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

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Royal Questions

dsu, graphs, greedy

Lucky Country

dp, dsu, graphs

AND Graph

bitmasks, dfs and similar, dsu, graphs

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Forbidden Indices

dsu, string suffix structures, strings

Deduction Queries

data structures, dsu

Three strings

data structures, dsu, string suffix structures, strings

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Leaf Sets

data structures, dfs and similar, dsu, graphs, greedy, sortings, trees

Prefix Enlightenment

dfs and similar, dsu, graphs

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Bear and Square Grid

dfs and similar, dsu, implementation

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Hercule Poirot Problem

dsu, graphs

Dima and Kicks

brute force, dsu, graphs, implementation

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Clearing Up

constructive algorithms, dp, dsu, graphs

Interestring graph and Apples

dfs and similar, dsu, graphs

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

Ski Base

combinatorics, dsu, graphs

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

New Year Domino

data structures, dp, dsu

Envy

data structures, dsu, graphs

st-Spanning Tree

dsu, graphs, greedy, implementation

Edges in MST

dfs and similar, dsu, graphs, sortings

Dominant Indices

data structures, dsu, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

School

dp, dsu

Leaders

dfs and similar, dsu, graphs, trees

Gift

dsu, graphs, sortings, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Network Safety

dfs and similar, dsu, graphs, math, sortings

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Love Triangles

dfs and similar, dsu, graphs

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Tourism

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

0-1-Tree

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

Fools and Foolproof Roads

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

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Petya and Spiders

bitmasks, dp, dsu