Creating Abbreviations

brute force, strings

Domino Tiles

implementation, math

Three Numbers on the Blackboard

math, math, math, math, sortings

Who Will Witness the End?

fft, math, math

What Will Remain at the End? (Hard Version)

data structures

What Will Remain at the End? (Easy Version)

brute force, data structures, data structures

How Long Until Nothing Remains?

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

Even If the World Turns

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

A Ribbon for Tomorrow

combinatorics, math

Hot Potatoes at the Fairy Warehouse

games, greedy, implementation

Nightcrawler

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

Whiplash

bitmasks, constructive algorithms, math, sortings

Chronostasis

binary search, data structures, greedy

Silhouette

constructive algorithms, math, sortings

Marenol (hard version)

greedy, sortings

Marenol (easy version)

greedy

Evanescent

implementation, strings, two pointers

Riptide

implementation, sortings

4-beauty

bitmasks, dp, graphs, math, number theory

Diameter Intersections

brute force, dfs and similar, fft, graphs, implementation, trees

Hypercarp and Interdimensional Jumps

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

Sum of Distinct Values in a Matrix

greedy, sortings, two pointers

Hypercarp and the Control Panel

brute force, data structures, two pointers

The Best Card

greedy, math, number theory

Spectral Components

dfs and similar, dp, dp, greedy, sortings, trees

Generational Triplets

bitmasks, combinatorics, dp, math

Array Replacement

greedy, sortings

Risky Tower

binary search, brute force, data structures, greedy, sortings

Always Changing

dp, greedy, math, strings

Boss Fight

data structures, greedy, greedy

String Construction

constructive algorithms, constructive algorithms

Threshold Movement

brute force, implementation, math

Even Simple Path

constructive algorithms, graphs, shortest paths

String (Hard Version)

divide and conquer, implementation, strings

String (Easy Version)

divide and conquer, implementation, strings

Xor Permutation Matrix

bitmasks, constructive algorithms, math

Double-Rift Dial

data structures, dfs and similar, dsu, implementation, two pointers

Permutation Cuts

combinatorics, implementation, math

Rank Subsequence

brute force, greedy, implementation

No Balance Left

bitmasks, dp, math, number theory

Matrix Elimination

binary search, greedy, math

Excuse for Breaks

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

Good Pair Queries

constructive algorithms, greedy, math

Maximize the Score

dp, greedy

Merge to Match

greedy, sortings

You Delete, I Delete

greedy

Paths on a Grid

data structures, dp, hashing

Build a Tree

constructive algorithms, trees, two pointers

XOR Sorting (Hard Version)

bitmasks, data structures, greedy

XOR Sorting (Easy Version)

bitmasks, greedy

Inversion of a Subsequence

greedy, math

Yet Another Constructive

constructive algorithms

Zero Sum

constructive algorithms, dp, number theory

Whoname and Unsorted Array

constructive algorithms

lce4113 and Security Game

bitmasks, interactive, interactive, math, probabilities

diss_quack and Array Game

bitmasks, brute force, games, greedy

0mar and Alternating Sums

combinatorics, dp, math

ezraft and Array

constructive algorithms, number theory

farmpiggie and Subset Sum

constructive algorithms

Connect Connect See

brute force, brute force, data structures

NPC Challenge

divide and conquer, interactive

Familiar?

brute force, combinatorics, dp

Tom and Jerry

dfs and similar, dsu, games, trees

Construct an Array (Hard Version)

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

Construct an Array (Easy Version)

dfs and similar, implementation, sortings

MEXOR

bitmasks, constructive algorithms, math

Delete and Concatenate

greedy

Who Watches the Watchpig?

greedy

Yura and Deadlines

data structures, dp

Anya Loves Trees!

dfs and similar, dp, greedy, trees, trees

Masha and the Garland

data structures, dp, greedy, implementation, math, number theory, strings

Yaroslav and Productivity

constructive algorithms, dp, greedy, math, number theory

Stepan and Permutation

constructive algorithms, dfs and similar, dsu, greedy, math, number theory, sortings, sortings, sortings

Nikita and Books

greedy, greedy, math, math, sortings, sortings

Iskander and Drawings

dp, games, greedy, strings

Summer Vacation

data structures, data structures, data structures, dp, dp, probabilities, trees

Product of Closures

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

Two Digit Strings

dp, strings

Unstable Elements

brute force, brute force, data structures, implementation, sortings, two pointers, two pointers

Predominant Frequency Division

data structures, greedy, implementation, math

Bigrams

sortings, strings

Summmon

binary search, data structures, greedy, implementation, math, number theory

A Bit Odd

data structures, games, greedy, math

Fair and Square

combinatorics, dp, graphs, math, number theory, trees

An Alternative Way

dp, greedy, math

RemovevomeR

greedy

Good times Good times

constructive algorithms, dfs and similar, math

Divide and Conquer

greedy, math, number theory

AI Finds Nothing Here

combinatorics, math

Another Popcount Problem

greedy

Colorful Works

dp, fft, games, implementation

The end of this world,

data structures, divide and conquer, dsu, graphs

Hunting the Beast

combinatorics, dp, graphs, math

Revival

binary search, data structures, math, two pointers

Decidophobia

greedy, math, sortings, two pointers

Nim Game Is XOR Game

constructive algorithms, games, greedy, math

Infinite Work

combinatorics, graphs, greedy, math, trees

Cake Trial

dp, greedy

Storming Arasaka

greedy, math, number theory

Village Guilds

dfs and similar, dp, trees