Turtle and an Incomplete Sequence

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

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Arithmancy (Easy)

brute force, constructive algorithms, interactive, strings

Exact Neighbours (Medium)

constructive algorithms

Exact Neighbours (Easy)

constructive algorithms

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

Yet Another Permutation Constructive

*special problem, constructive algorithms

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Buying Jewels

constructive algorithms, greedy, math

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Binary Search

binary search, constructive algorithms, greedy

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Lexicographically Largest

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

Slimes

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

Increasing Subsequences

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

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Mathematical Problem

brute force, constructive algorithms, geometry, math

Evaluate It and Back Again

constructive algorithms, implementation, math

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Merge Not Sort

constructive algorithms, dp

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

Colorful Grid

constructive algorithms

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Autosynthesis

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

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Salyg1n and Array (hard version)

constructive algorithms, interactive

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

Cyclic Operations

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

Dual (Hard Version)

constructive algorithms, math

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Array Painting

constructive algorithms, greedy, two pointers

Rudolph and Mimic

constructive algorithms, implementation, interactive

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Ksyusha and Chinchilla

constructive algorithms, dfs and similar, dp, dsu, greedy, implementation, trees

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

Unique Palindromes

constructive algorithms, math, strings

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Between

constructive algorithms, dfs and similar, graphs, greedy

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Binary String Sorting

constructive algorithms, greedy

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Letter Exchange

constructive algorithms

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Train Splitting

constructive algorithms, graphs, greedy

King's Puzzle

constructive algorithms

Amazing Trick

constructive algorithms, graph matchings, math, probabilities

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Watch the Videos

binary search, constructive algorithms, two pointers

Another Array Problem

brute force, constructive algorithms, greedy

GCD Queries

constructive algorithms, interactive, number theory

Restore the Permutation

binary search, constructive algorithms, data structures, greedy, math

Range = √Sum

binary search, brute force, constructive algorithms, math, two pointers

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

Hanging Hearts

constructive algorithms, data structures, dfs and similar, dp, greedy, trees

Permutation Addicts

constructive algorithms, data structures, dfs and similar, dsu, graphs, trees

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Rectangular Congruence

constructive algorithms, number theory

Prefixes and Suffixes

constructive algorithms, strings, two pointers

Letter Picking

constructive algorithms, dp, games, two pointers

Edge Split

brute force, constructive algorithms, dfs and similar, dsu, graphs, probabilities, trees

Hot Black Hot White

constructive algorithms, math

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Build a Tree and That Is It

constructive algorithms, implementation, trees

Tournament Countdown

constructive algorithms, greedy, interactive, number theory, probabilities

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Recover an RBS

constructive algorithms, greedy, implementation, strings

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

Mark and Lightbulbs

combinatorics, constructive algorithms, greedy, math, sortings

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Magical Array

constructive algorithms, hashing, implementation, math

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Helping the Nature

constructive algorithms, data structures, greedy

The Third Problem

combinatorics, constructive algorithms, math

Guess The String

binary search, constructive algorithms, interactive

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Manipulating History

constructive algorithms, greedy, strings

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

MEX vs DIFF

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

Traps

constructive algorithms, greedy, sortings