White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Vlad and Unfinished Business

dfs and similar, dp, greedy, trees

Palindrome Basis

brute force, dp, math, number theory

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths

Get an Even String

dp, greedy, strings

Line Empire

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

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Increase Subarray Sums

brute force, dp, greedy, implementation

Yet Another Minimization Problem

dp, greedy, math

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Make Them Equal

dp, greedy

Strange Test

binary search, bitmasks, brute force, dp, math

Monsters And Spells

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

Road Optimization

dp

BA-String

brute force, dp, greedy, implementation, math

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

Array and Operations

dp, greedy, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Complex Market Analysis

binary search, dp, implementation, number theory, schedules, two pointers

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Delete Two Elements

data structures, dp, implementation, math, two pointers

The Number of Imposters

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

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Omkar and Determination

data structures, dp

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Portal

brute force, data structures, dp, greedy, implementation

Divisible by Twenty-Five

brute force, dfs and similar, dp

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Fix the String

*special problem, bitmasks, dp, greedy

Carrying Conundrum

bitmasks, combinatorics, dp, math

Two Hundred Twenty One (easy version)

data structures, dp, math

Up the Strip (simplified version)

brute force, data structures, dp, math, number theory

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Coin Rows

brute force, constructive algorithms, dp, implementation

Backspace

dp, greedy, strings, two pointers

Penalty

bitmasks, brute force, dp, greedy

Reverse String

brute force, dp, hashing, implementation, strings

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Interesting Function

binary search, dp, math, number theory

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Diluc and Kaeya

data structures, dp, hashing, number theory

Playoff Tournament

data structures, dfs and similar, dp, implementation, trees

Unstable String

binary search, dp, greedy, implementation, strings, two pointers

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Kavi on Pairing Duty

combinatorics, dp, math

Parsa's Humongous Tree

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

Potions (Easy Version)

brute force, data structures, dp, greedy

I Hate 1111

dp, math, number theory

Armchairs

dp, flows, graph matchings, greedy

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Explorer Space

dp, graphs, shortest paths

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

AGAGA XOOORRR

bitmasks, brute force, dp, greedy

Add One

dp, matrices

Short Task

brute force, dp, math, number theory

The Sports Festival

dp, greedy

Planar Reflections

brute force, data structures, dp

Square-Free Division (easy version)

data structures, dp, greedy, math, number theory, two pointers

Maximum width

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

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Replace and Keep Sorted

dp, implementation, math

Journey

dfs and similar, dp, dsu, implementation

Longest Simple Cycle

dp, graphs, greedy

Cleaning the Phone

binary search, dp, sortings, two pointers

Program

data structures, dp, implementation, strings

Correct Placement

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

Even-Odd Game

dp, games, greedy, sortings

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Building a Fence

dp, greedy, implementation, two pointers

Canine poetry

dp, greedy, strings

Random Events

dp, math, probabilities

Find the Spruce

brute force, dp, implementation

Move and Turn

dp, math

Sequence and Swaps

dp, greedy, sortings

Radio Towers

combinatorics, dp, math

String Equality

dp, greedy, hashing, implementation, strings

Catching Cheaters

dp, strings

Saving the City

dp, greedy, math, sortings

Extreme Subtraction

constructive algorithms, dp, greedy

Chef Monocarp

dp, flows, graph matchings, greedy, math, sortings

Bargain

combinatorics, dp, math

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Bouncing Ball

brute force, dp, implementation

Two Platforms

binary search, dp, sortings, two pointers

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Maximum Product

brute force, dp, greedy, implementation, sortings

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Colored Rectangles

dp, greedy, sortings

Good Subarrays

data structures, dp, math

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Boboniu Chats with Du

dp, greedy, sortings, two pointers

Omkar and Bed Wars

dp, greedy

Cyclic Permutations

combinatorics, dp, graphs, math

Good String

brute force, dp, greedy, two pointers

Array Walk

brute force, dp, greedy

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation