Island Puzzle

dfs and similar, dsu, graphs, trees

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Iqea

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

Cycle sort

dsu, math

Clockwork Bomb

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

Welcome home, Chtholly

data structures, dsu

Campus

binary search, data structures, dsu, trees

Visible Black Areas

data structures, dsu, geometry, trees

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Pastoral Oddities

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

...Wait for it...

data structures, dsu, trees

Leaders

dfs and similar, dsu, graphs, trees

Forced Online Queries Problem

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

Timofey and our friends animals

data structures, divide and conquer, dsu

Reclamation

dsu

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Drazil and Morning Exercise

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

Fairy

dfs and similar, divide and conquer, dsu

Digit Tree

dfs and similar, divide and conquer, dsu, trees

MUH and Lots and Lots of Segments

data structures, dsu

Distinctification

data structures, dsu, greedy

Alien DNA

data structures, dsu, trees

Appleman and Complicated Task

dsu, math

Extending Set of Points

data structures, divide and conquer, dsu

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Holes

data structures, dsu

Entertaining Geodetics

brute force, dsu, implementation

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Pairs

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

Bipartite Checking

data structures, dsu, graphs

Dima and Kicks

brute force, dsu, graphs, implementation

DZY Loves Planting

binary search, dsu, trees

Clearing Up

constructive algorithms, dp, dsu, graphs

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

Deduction Queries

data structures, dsu

Peterson Polyglot

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

Two Paths

constructive algorithms, dsu, graphs, implementation

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Binary Matrix

dsu

Opening Portals

dsu, graphs, shortest paths

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Royal Questions

dsu, graphs, greedy

Fools and Foolproof Roads

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

Ski Base

combinatorics, dsu, graphs

Bipartite Segments

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

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Envy

data structures, dsu, graphs

Bear and Square Grid

dfs and similar, dsu, implementation

Edges in MST

dfs and similar, dsu, graphs, sortings

School

dp, dsu

Savior

brute force, dsu, math

Cutting a Fence

binary search, data structures, dsu

Power Tree

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

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Three strings

data structures, dsu, string suffix structures, strings

Vasya and Maximum Profit

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

Lucky Country

dp, dsu, graphs

Session in BSU

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

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

GCD Counting

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

Acyclic Organic Compounds

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

Leaf Sets

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

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Information Graph

dfs and similar, dsu, graphs, trees

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Unstable String Sort

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

Hercule Poirot Problem

dsu, graphs

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Forbidden Indices

dsu, string suffix structures, strings

Interestring graph and Apples

dfs and similar, dsu, graphs

Beautiful Road

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

Gift

dsu, graphs, sortings, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Valera and Swaps

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

Nanami's Digital Board

dsu, implementation

Network Safety

dfs and similar, dsu, graphs, math, sortings

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Dominant Indices

data structures, dsu, trees

AND Graph

bitmasks, dfs and similar, dsu, graphs

MST Unification

binary search, dsu, graphs, greedy

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Love Triangles

dfs and similar, dsu, graphs

Table Compression

dfs and similar, dp, dsu, graphs, greedy

0-1-Tree

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

Lomsat gelral

data structures, dfs and similar, dsu, trees

Building Forest

data structures, dsu, graphs

Beard Graph

data structures, dsu, trees

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Kuro and GCD and XOR and SUM

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

New Year Domino

data structures, dp, dsu

st-Spanning Tree

dsu, graphs, greedy, implementation

Tourism

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

Spanning Tree with One Fixed Degree

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

Weird journey

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