The Enchanted Forest

brute force, greedy

Odd Subarrays

dp, greedy

Everything Everywhere All But One

greedy

The Ultimate LIS Problem

data structures, greedy

Permutation Weight (Hard Version)

constructive algorithms, greedy

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Bring Balance

brute force, constructive algorithms, greedy

Linguistics

greedy, implementation, sortings, strings

Circular Local MiniMax

constructive algorithms, greedy, sortings

Hard Cut

constructive algorithms, dfs and similar, divide and conquer, math

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

Diverse Segments

data structures, two pointers

MEX vs DIFF

binary search, brute force, constructive algorithms, data structures, greedy, two pointers

Traps

constructive algorithms, greedy, sortings

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

Z mod X = C

constructive algorithms, math

Digit Minimization

constructive algorithms, games, math, strings

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

Circular Spanning Tree

constructive algorithms, implementation, trees

LIS or Reverse LIS?

constructive algorithms, greedy, implementation, math

AND Sorting

bitmasks, constructive algorithms, sortings

Palindromic Indices

greedy, strings

Unique Occurrences

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

Labyrinth Adventures

data structures, dp, matrices, shortest paths

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Double Sort

implementation, sortings

Card Trick

implementation, math

Game with Cards

games, greedy

Lenient Vertex Cover

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

Moving Chips

bitmasks, dp, greedy

Dog Walking

brute force, greedy, math

Binary String

binary search, greedy, strings, two pointers

Robots

implementation

Minimums and Maximums

brute force, math

Formalism for Formalism

bitmasks, dp, math

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Toss a Coin to Your Graph...

binary search, dfs and similar, dp, graphs

Rooks Defenders

data structures, implementation

Stone Age Problem

data structures, implementation

AvtoBus

brute force, greedy, math, number theory

Tokitsukaze and Good 01-String (hard version)

dp, greedy, implementation

Tokitsukaze and Good 01-String (easy version)

implementation

Tokitsukaze and All Zero Sequence

implementation

Tokitsukaze and Gems

dp, math

Tokitsukaze and Beautiful Subsegments

data structures

Tokitsukaze and Permutations

dp, math

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Tokitsukaze and Meeting

data structures, implementation, math

Tokitsukaze and Strange Inequality

brute force, data structures, dp

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Maximum Crossings (Easy Version)

brute force

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Eating Queries

binary search, greedy, sortings

X-Sum

brute force, greedy, implementation

Most Similar Words

brute force, greedy, implementation, implementation, math, strings

Equal Candies

greedy, math, sortings

Lucky?

implementation

Sorting Pancakes

dp

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Replace With the Previous, Minimize

dsu, greedy, strings

Vertical Paths

graphs, implementation, trees

Detective Task

implementation

Make It Increasing

greedy, implementation

Food for Animals

greedy, math

Remove Directed Edges

dfs and similar, dp, graphs

Desktop Rearrangement

data structures, greedy, implementation

Breaking the Wall

binary search, brute force, constructive algorithms, greedy, math

A-B-C Sort

constructive algorithms, implementation, sortings

Infinite Replacement

combinatorics, implementation, strings

Dictionary

combinatorics, math

Number Transformation

constructive algorithms, math

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Power or XOR?

bitmasks, combinatorics, math, number theory

Lost Arithmetic Progression

combinatorics, math, number theory

Palindrome Basis

brute force, dp, math, number theory

A Perfectly Balanced String?

brute force, greedy, strings

Subtle Substring Subtraction

games, greedy, strings

PermutationForces

data structures, greedy

Zigu Zagu

constructive algorithms, data structures, greedy

Cross Xor

constructive algorithms, graphs, math, matrices

Checker for Array Shuffling

constructive algorithms, dfs and similar, graphs

Array Shuffling

constructive algorithms, graphs, greedy

notepad.exe

binary search, constructive algorithms, greedy, interactive

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Unequal Array

constructive algorithms, greedy, implementation

I love AAAB

constructive algorithms, implementation

Log Chopping

games, implementation, math

Permutation Counting

brute force, combinatorics, dp, fft, math

Preorder

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

Insert a Progression

brute force, constructive algorithms, greedy

Dolce Vita

binary search, brute force, greedy, math

Consecutive Points Segment

brute force, math, sortings

String Building

implementation

Jee, You See?

bitmasks, combinatorics, dp

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Very Suspicious

binary search, brute force, geometry, greedy, implementation, math

Where is the Pizza?

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

Dorms War

brute force, implementation, strings