Unshuffling a Deck

constructive algorithms, implementation

Chess Cheater

greedy, implementation, sortings

Symmetric Matrix

implementation

Floor Number

implementation, math

Excitation of Atoms

greedy, implementation

Minlexes

dp, greedy, implementation, strings

Nice Matrix

greedy, implementation, math

Swedish Heroes

brute force, dp, implementation

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Putting Bricks in the Wall

constructive algorithms, implementation

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Rain of Fire

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

Decryption

constructive algorithms, implementation, math, number theory

Killjoy

greedy, implementation, math

Stairs

brute force, constructive algorithms, greedy, implementation, math

Digit Game

games, greedy, implementation

Trash Problem

data structures, implementation

Showing Off

flows, graph matchings, greedy, implementation

Graph and Queries

data structures, dsu, graphs, implementation, trees

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Bouncing Ball

brute force, dp, implementation

Shurikens

data structures, greedy, implementation

Perform Easily

binary search, brute force, dp, implementation, sortings, two pointers

A New Technique

implementation

Grime Zoo

brute force, greedy, implementation, strings

In-game Chat

implementation

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Maximum Product

brute force, dp, greedy, implementation, sortings

Subset Mex

greedy, implementation, math

Array Cancellation

constructive algorithms, implementation

Balanced Bitstring

implementation, strings

Chess Rush

*special problem, combinatorics, dp, implementation, math

Fancy Fence

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

Divide Square

data structures, geometry, implementation, sortings

Maximum Distributed Tree

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

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Two Types of Spells

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

Monster Invaders

dp, greedy, implementation

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Omkar and Waterslide

greedy, implementation

Omkar and Infinity Clock

implementation, math

505

bitmasks, brute force, constructive algorithms, dp, greedy, implementation

Fix You

brute force, greedy, implementation

Segment Intersections

brute force, greedy, implementation, math

Captain Flint and Treasure

data structures, dfs and similar, graphs, greedy, implementation, trees

Columns Swaps

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

Removing Leaves

data structures, greedy, implementation, trees

a-Good String

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

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Merging Towers

data structures, dsu, implementation, trees

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Create The Teams

brute force, dp, greedy, implementation, sortings

Acacius and String

brute force, implementation, strings

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Donut Shops

greedy, implementation, math

Omkar and Completion

constructive algorithms, implementation

Raging Thunder

data structures, divide and conquer, implementation

Grid-00100

constructive algorithms, greedy, implementation

A Cookie for You

greedy, implementation, math

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Maximum GCD

greedy, implementation, math, number theory

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

AccurateLee

greedy, implementation, strings

Lamps on a Circle

games, implementation, interactive, math

C+=

brute force, greedy, implementation, math

Task On The Board

constructive algorithms, greedy, implementation, sortings

Short Substrings

implementation, strings

Swaps Again

constructive algorithms, implementation, sortings

Solve The Maze

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

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Trouble Sort

constructive algorithms, implementation

Matrix Game

games, greedy, implementation

Ehab's Last Corollary

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

Guess The Maximums

binary search, implementation, interactive, math

Subsequence Hate

implementation, strings

Odd Selection

brute force, implementation, math

Johnny and Ancient Computer

implementation

Johnny and New Toy

data structures, implementation, math

Johnny and James

greedy, implementation, math, trees

Johnny and Grandmaster

greedy, implementation, math, sortings

Polygon

dp, graphs, implementation, shortest paths

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

New Theatre Square

brute force, dp, greedy, implementation, two pointers

Tasty Cookie

binary search, constructive algorithms, greedy, implementation

Are You Fired?

constructive algorithms, data structures, greedy, implementation

The Best Vacation

binary search, brute force, greedy, implementation, two pointers

Count Triangles

binary search, implementation, math, two pointers

Sequence with Digits

brute force, implementation, math

Ternary String

binary search, dp, implementation, two pointers

Special Elements

brute force, implementation, two pointers

Alice, Bob and Candies

implementation

Sum of Round Numbers

implementation, math