Whoname and Unsorted Array

constructive algorithms

lce4113 and Security Game

bitmasks, interactive, interactive, math, probabilities

diss_quack and Array Game

bitmasks, brute force, games, greedy

0mar and Alternating Sums

combinatorics, dp, math

Connect Connect See

brute force, brute force, data structures

NPC Challenge

divide and conquer, interactive

Familiar?

brute force, combinatorics, dp

Tom and Jerry

dfs and similar, dsu, games, trees

Construct an Array (Hard Version)

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

Construct an Array (Easy Version)

dfs and similar, implementation, sortings

MEXOR

bitmasks, constructive algorithms, math

Yura and Deadlines

data structures, dp

Anya Loves Trees!

dfs and similar, dp, greedy, trees, trees

Masha and the Garland

data structures, dp, greedy, implementation, math, number theory, strings

Summer Vacation

data structures, data structures, data structures, dp, dp, probabilities, trees

Product of Closures

bitmasks, brute force, constructive algorithms, greedy, implementation, math, number theory

Two Digit Strings

dp, strings

Summmon

binary search, data structures, greedy, implementation, math, number theory

A Bit Odd

data structures, games, greedy, math

Fair and Square

combinatorics, dp, graphs, math, number theory, trees

Colorful Works

dp, fft, games, implementation

The end of this world,

data structures, divide and conquer, dsu, graphs

Hunting the Beast

combinatorics, dp, graphs, math

Revival

binary search, data structures, math, two pointers

Decidophobia

greedy, math, sortings, two pointers

Infinite Work

combinatorics, graphs, greedy, math, trees

Cake Trial

dp, greedy

Storming Arasaka

greedy, math, number theory

Village Guilds

dfs and similar, dp, trees

DBFS Order (Hard Version)

dp, trees

DBFS Order (Easy Version)

dp, trees

Slime and Queries

data structures, greedy, trees

Send GCDs

communication, constructive algorithms, interactive, math, number theory

Paint the Array

data structures, dp, greedy

Permutation Commutation

data structures, graphs, greedy

Fullmetal Bitchemist

constructive algorithms, greedy, math

Criterion in Burlandia

binary search, bitmasks, brute force, brute force, data structures, data structures, dfs and similar, divide and conquer, implementation, trees, two pointers

Elections in Saransk (hard version)

combinatorics, dp, dp, dp, math, number theory

Elections in Saransk (easy version)

number theory

Friendly Gifts

brute force, dp

Stripe, Token and Two Players

data structures, dp, games

Vessels, Heights and Two Versions (Hard Version)

data structures, dfs and similar, dsu, greedy, implementation, two pointers

Vlad, Misha and Two Arrays

brute force, combinatorics, dfs and similar, divide and conquer, math

XOR, Expression and Two Binary Numbers

bitmasks, divide and conquer, dp, math, number theory

Shortest GCD Paths

dp, graphs, math, number theory, shortest paths, shortest paths

Permutation Transmission (Difficult Version)

bitmasks, combinatorics, sortings

Permutation Transmission (Easy Version)

bitmasks, combinatorics, sortings

Goods on the Shelf

brute force, data structures, implementation, two pointers

Cost of a Bracket Sequence

brute force, dp, greedy

The Cake Is a Lie

greedy, math, number theory, number theory

Snaking Arrangement

combinatorics, combinatorics, combinatorics, constructive algorithms

Magical Tiered Cake

constructive algorithms, constructive algorithms, dfs and similar, dp, greedy

Seating Arrangement (Hard Version)

binary search, binary search, binary search, greedy, greedy, greedy, math, two pointers

Quadratic Jumps

brute force, constructive algorithms, greedy, math, number theory

Graph Cutting

dfs and similar, dp, math, trees

Maximum Prefix Sums

constructive algorithms, greedy, implementation, two pointers

Chipmunk Theo and Equality

implementation, sortings

Game on Growing Tree

binary search, dfs and similar, divide and conquer, dp, games, implementation, trees

Minimum Influence

binary search, data structures, greedy, implementation, math, sortings, two pointers

Good Schedule

dp, greedy

The Endians

dp, trees

Wowee Binary String

combinatorics, dp, strings

Roadworks

binary search, data structures, dp, greedy, two pointers

Load Unbalancing

binary search, bitmasks, dp, greedy

Deconstruction Tree

combinatorics, data structures, dp, graphs, trees

Me When Median Problem

binary search, greedy

We Be Flipping (Hard Version)

constructive algorithms, dp, greedy

Momoyo and the Network

binary search, dfs and similar, dfs and similar, divide and conquer, divide and conquer, dp, trees

Amanojaku and Sequence (Hard Version)

combinatorics, data structures, implementation, math

Amanojaku and Sequence (Easy Version)

combinatorics, math

Sanae, Cross and Color

binary search, data structures, implementation

Cirno and Number (Hard Version)

binary search, dfs and similar, dp, greedy, implementation

Cirno and Number (Easy Version)

binary search, brute force, dp, greedy, implementation

Fallen Leaves

dfs and similar, dp, dp, trees, trees

Drowning

binary search, data structures, math

It Just Keeps Going Sideways

binary search, data structures, data structures, dp, dp, greedy, greedy, math, math

It All Went Sideways

binary search, data structures, dp, greedy

Stop Spot

implementation, strings, trees

Inversion Invasion

math, number theory

Mental Monumental (Hard Version)

data structures, greedy, math, two pointers

Reserved Reversals

constructive algorithms, dp, greedy, math

Mental Monumental (Easy Version)

binary search, data structures, greedy, math, two pointers

Simple Problem

brute force, graphs, greedy, number theory

String Cutting

binary search, brute force, brute force, greedy, hashing, string suffix structures, string suffix structures, strings, strings

Covering Points with Circles

constructive algorithms, geometry, math

Exceptional Segments

bitmasks, brute force, math

Zhily and Colorful Strings

divide and conquer, fft, math

Zhily and Permutation

data structures, divide and conquer, trees

Zhily and Cycle

graphs, greedy

Zhily and Signpost

chinese remainder theorem, dfs and similar, math, number theory, trees

Zhily and Barknights

binary search, data structures, dp, math, sortings, two pointers

Counting Sort?

brute force, combinatorics, dp

Statistics on Tree

binary search, brute force, dfs and similar, dfs and similar, divide and conquer, graphs, trees, trees

Building Tree

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

Seek the Truth

binary search, bitmasks, constructive algorithms, interactive

Permutation Construction

constructive algorithms, data structures, sortings

Median Partition

dp, math

Weird Chessboard

constructive algorithms, math

MEX Replacement on Tree

data structures, implementation, math, trees

Coloring a Red Black Tree

dfs and similar, dp, greedy, math, probabilities, trees, trees