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

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

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

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

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

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

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

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

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

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

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

Unique Values (Hard version)

binary search, bitmasks, constructive algorithms, interactive

Unique Values (Easy version)

binary search, constructive algorithms, divide and conquer, interactive, math

The 67th Iteration of "Counting is Fun"

implementation, math

Closer

dfs and similar, dp, trees

Down the Pivot

combinatorics, dp, math, trees

Interval Game

bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities

Definitely Larger

binary search, constructive algorithms, data structures, graphs, greedy, sortings

Flip the Bit (Hard Version)

greedy, implementation, math

Maze

trees

Research

games

Star Map

constructive algorithms, data structures, geometry, greedy, sortings

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Oriented Journey

bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees

RReeppeettiittiioonn

binary search, brute force, implementation, math, number theory

Interval Mod

constructive algorithms, dp, greedy, math

Median Deletion

Rational Bubble Sort

constructive algorithms, geometry, greedy

Learning Binary Search

combinatorics, divide and conquer, dp, math

Minimum Path Cover

brute force, dp, greedy, interactive, interactive, math, number theory, trees

AND-array

bitmasks, combinatorics, math

Equal Multisets (Hard Version)

constructive algorithms, dsu, greedy

A Simple Problem

binary search, data structures, greedy, math, trees

Binary Strings are Simple?

constructive algorithms, implementation, interactive, number theory

A Simple RBS Problem

constructive algorithms, math, strings, trees

A Simple GCD Problem (Hard Version)

dp, greedy, number theory

Dynamic Values And Maximum Sum

data structures, data structures, greedy, implementation, trees

A Trivial String Problem

brute force, dp, hashing, string suffix structures, strings

Ghostfires

constructive algorithms, greedy