Even If the World Turns

communication, constructive algorithms, expression parsing, greedy, interactive, math, number theory

Whiplash

bitmasks, constructive algorithms, math, sortings

Construct an Array (Hard Version)

2-sat, constructive algorithms, dfs and similar, graphs, implementation

Product of Closures

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

Magical Tiered Cake

constructive algorithms, constructive algorithms, dfs and similar, dp, greedy

Maximum Prefix Sums

constructive algorithms, greedy, implementation, two pointers

Reserved Reversals

constructive algorithms, dp, greedy, math

Covering Points with Circles

constructive algorithms, geometry, math

Seek the Truth

binary search, bitmasks, constructive algorithms, interactive

Permutation Construction

constructive algorithms, data structures, sortings

Unique Values (Hard version)

binary search, bitmasks, constructive algorithms, interactive

Unique Values (Easy version)

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

Definitely Larger

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

Oriented Journey

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

Interval Mod

constructive algorithms, dp, greedy, math

Equal Multisets (Hard Version)

constructive algorithms, dsu, greedy

A Simple RBS Problem

constructive algorithms, math, strings, trees

Ghostfires

constructive algorithms, greedy

Tree Orientation (Easy Version)

constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees

N-MEX (Constructive Version)

constructive algorithms, greedy

Sum of Digits (and Again)

brute force, constructive algorithms, math

Recollect Numbers

constructive algorithms

Swap to Rearrange

constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, greedy, strings

XOR-convenience (Hard Version)

bitmasks, constructive algorithms, math

Shortest Statement Ever

bitmasks, constructive algorithms, dp, greedy

Tree Coloring (Hard Version)

combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees

XOR-factorization

bitmasks, constructive algorithms, dp, greedy, number theory

Blackslex and Another RGB Walking

communication, constructive algorithms, graphs, interactive, number theory, trees

Blackslex and Girls

constructive algorithms, geometry, math

Xmas or Hysteria

constructive algorithms, greedy, implementation, math

Shiro's Mirror Duel

constructive algorithms, greedy, interactive, probabilities, sortings

Anisphia Wynn Palettia and Good Permutations

constructive algorithms, greedy, number theory

Almost Roman

constructive algorithms, greedy, implementation

Siga ta Kymata

constructive algorithms, greedy, implementation, math

Beautiful Tree

constructive algorithms, math, probabilities, trees

Beautiful Intervals

constructive algorithms, greedy

MAD Interactive Problem

constructive algorithms, implementation, interactive

Palindrome Flipping

brute force, constructive algorithms, graphs, implementation, shortest paths, strings

Find the Last Number

binary search, bitmasks, constructive algorithms, interactive

Batteries

brute force, constructive algorithms, graph matchings, graphs, interactive, math

Catshock

constructive algorithms, dfs and similar, graphs, trees, two pointers

Monotone Subsequence

constructive algorithms, graphs, greedy, interactive, math

Max Sum OR (Hard Version)

bitmasks, constructive algorithms, divide and conquer, greedy

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

From the Unknown (Easy Version)

constructive algorithms, interactive, math

For the Champion

constructive algorithms, interactive, math

Interactive RBS (Medium Version)

binary search, bitmasks, constructive algorithms, interactive

Interactive RBS (Easy Version)

binary search, bitmasks, constructive algorithms, interactive

Ancient Tree

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

Make it Zero

constructive algorithms, greedy, math

Minimize Fixed Points

constructive algorithms, number theory

Manhattan Pairs

constructive algorithms, geometry, greedy, math, sortings

Gellyfish and Camellia Japonica

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

Build an Array

brute force, constructive algorithms, dp, greedy, math, number theory

Cheater

binary search, constructive algorithms, greedy, implementation

Smilo and Minecraft

brute force, constructive algorithms, greedy

Reachability and Tree

constructive algorithms, dfs and similar, graphs, trees

Hacking Numbers (Medium Version)

constructive algorithms, interactive, math, number theory

Baudelaire (easy version)

binary search, constructive algorithms, divide and conquer, greedy, interactive, trees

Local Construction

constructive algorithms, dfs and similar, implementation, two pointers

Wonderful Lightbulbs

combinatorics, constructive algorithms, math

She knows...

combinatorics, constructive algorithms, graphs, math

Mishkin Energizer

brute force, constructive algorithms, greedy, implementation, strings

Simple Permutation

constructive algorithms, number theory

Serval and Modulo

constructive algorithms, math, number theory

Finding OR Sum

bitmasks, constructive algorithms, implementation, interactive, math

Goodbye, Banker Life

2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory

Trapmigiano Reggiano

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

Game with Binary String

constructive algorithms, data structures, divide and conquer, games, greedy, math

White Magic

constructive algorithms, data structures, dp, greedy, implementation

Fix Flooded Floor

constructive algorithms, dp, graphs

Kevin and Bipartite Graph

constructive algorithms, graphs, greedy

Hard Demon Problem

constructive algorithms, data structures, dp, implementation, math

Non Prime Tree

brute force, constructive algorithms, dfs and similar, greedy, number theory, trees, two pointers

Shohag Loves GCD

constructive algorithms, greedy, math, number theory

Guess One Character

constructive algorithms, implementation, interactive

Library of Magic

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

Permutations Harmony

combinatorics, constructive algorithms, greedy, hashing, math

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Common Generator

brute force, constructive algorithms, math, number theory

Cool Graph

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

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

Asesino (Easy Version)

binary search, brute force, constructive algorithms, implementation, interactive

Adjust The Presentation (Hard Version)

constructive algorithms, data structures, greedy, implementation, sortings

Iris and Game on the Tree

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

Longest Max Min Subsequence

brute force, constructive algorithms, data structures, greedy, implementation

Perform Operations to Maximize Score

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

Squaring

brute force, constructive algorithms, greedy, implementation, math, number theory

Funny Game

constructive algorithms, dsu, graphs, greedy, math, number theory, trees

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Coloring Game

constructive algorithms, dfs and similar, games, graphs, greedy, interactive

Prime XOR Coloring

bitmasks, constructive algorithms, graphs, greedy, math, number theory

Swap Dilemma

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

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