Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Unique Occurrences

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

Lenient Vertex Cover

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

Replace With the Previous, Minimize

dsu, greedy, strings

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Narrow Components

brute force, data structures, dp, dsu, math, trees

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Words on Tree

2-sat, dfs and similar, dsu, graphs, trees

Air Reform

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

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Inversion Graph

data structures, dsu, graphs, math

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Groceries in Meteor Town

binary search, data structures, dsu, trees

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Equal or Not Equal

constructive algorithms, dsu, implementation

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

Trader Problem

data structures, dsu, greedy, sortings

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Social Network

dsu, graphs, greedy, implementation, trees

The Number of Imposters

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

Hemose Shopping

constructive algorithms, dsu, math, sortings

Labyrinth

binary search, dsu, greedy

Building Forest Trails

data structures, dsu

Jeopardy of Dropped Balls

binary search, brute force, dsu, implementation

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

One-Four Overload

2-sat, constructive algorithms, dfs and similar, dsu, graphs, implementation

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Mocha and Diana (Easy Version)

brute force, constructive algorithms, dsu, graphs, greedy, trees

Gates to Another World

bitmasks, data structures, dsu, two pointers

Good Graph

data structures, dsu, graphs, trees

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Figure Fixing

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

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Phoenix and Earthquake

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

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Playlist

data structures, dsu, implementation, shortest paths

Journey

dfs and similar, dp, dsu, implementation

Road Reform

dsu, graphs, greedy

Bakery

data structures, dsu

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Team-Building

data structures, dfs and similar, dsu, graphs

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

A Convex Game

dsu, games

Virus

data structures, divide and conquer, dsu, graphs

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Graph and Queries

data structures, dsu, graphs, implementation, trees

Peaceful Rooks

dfs and similar, dsu, graphs

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Merging Towers

data structures, dsu, implementation, trees

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Robots on a Grid

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

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Cow and Vacation

dfs and similar, dsu, trees

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Number of Components

dsu, implementation

NEKO's Maze Game

data structures, dsu, implementation

Prefix Enlightenment

dfs and similar, dsu, graphs

Segment Tree

data structures, dsu, graphs, trees

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Secret Passwords

dfs and similar, dsu, graphs

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Harmonious Graph

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

Books Exchange (hard version)

dfs and similar, dsu, math

Books Exchange (easy version)

dsu, math

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

0-1 MST

dfs and similar, dsu, graphs, sortings

Alice and the Unfair Game

binary search, data structures, dp, dsu

Tourism

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

Forced Online Queries Problem

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

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Unstable String Sort

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

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Cow and Snacks

dfs and similar, dsu, graphs

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Cover it!

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

News Distribution

dfs and similar, dsu, graphs

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

0-1-Tree

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

Extending Set of Points

data structures, divide and conquer, dsu

Edgy Trees

dfs and similar, dsu, graphs, math, trees