Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

MEX Tree Manipulation

data structures, trees

Dangerous Laser Power

constructive algorithms, dsu, sortings

Conditional Mix

combinatorics, dp, math

Hanging Hearts

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

Knowledge Cards

constructive algorithms, data structures

Bricks and Bags

constructive algorithms, games, greedy, sortings

Jumbo Extra Cheese 2

geometry, greedy, sortings

Factorise N+M

constructive algorithms, number theory

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Cleaning Robot

bitmasks, dp

Reset K Edges

binary search, data structures, dfs and similar, graphs, greedy, trees

Card Game

combinatorics, constructive algorithms, dp, games

Array Recovery

constructive algorithms, greedy, math

Immobile Knight

implementation

Palindrome Addicts

data structures, strings

Anti-Increasing Addicts

constructive algorithms, dp, greedy, math

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Balance Addicts

combinatorics, dp, math, two pointers

Permutation Addicts

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

Even Number Addicts

dp, games, greedy, math

Prefix Sum Addicts

constructive algorithms, greedy, math, sortings

Glory Addicts

greedy, implementation, sortings

Ela Takes Dancing Class

binary search, data structures

Ela and Prime GCD

constructive algorithms, math, number theory

Ela Goes Hiking

combinatorics, dp, math, probabilities

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Ela and Crickets

constructive algorithms, games, implementation, math

Ela's Fitness and the Luxury Number

binary search, implementation, math

Ela Sorting Books

greedy, implementation, strings

Swap and Take

dp, greedy

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Playing with GCD

math, number theory

Make A Equal to B

brute force, greedy, sortings

Pebbles and Beads

data structures, geometry

House Planning

constructive algorithms, data structures, graph matchings, greedy

Meta-set

brute force, combinatorics, data structures, hashing, math

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Tea with Tangerines

greedy, math

Working Week

constructive algorithms, greedy, math

Zeros and Ones

bitmasks, divide and conquer, dp, math

Rectangular Congruence

constructive algorithms, number theory

Slime Escape

data structures, dp, greedy, two pointers

Removing Smallest Multiples

greedy, math

Bright, Nice, Brilliant

constructive algorithms

Select Three Sticks

brute force, greedy, sortings

Conveyor

constructive algorithms, dp, math

Zero-One (Hard Version)

dp, greedy

Zero-One (Easy Version)

constructive algorithms, greedy, math

Parity Shuffle Sorting

constructive algorithms, sortings

Rule of League

constructive algorithms, math

Consecutive Sum

greedy, sortings

Location

data structures, dp, math, number theory

Balance (Hard version)

brute force, data structures, number theory

Balance (Easy version)

brute force, data structures, implementation, number theory

Sheikh (Hard Version)

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

Sheikh (Easy version)

binary search, bitmasks, greedy, two pointers

Ugu

brute force, dp, greedy, implementation

Bestie

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

Function Sum

brute force, combinatorics, dp, fft, math

Graph Cost

dp, greedy, math, number theory

Valiant's New Map

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

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Kill Demodogs

greedy, math

Joey Takes Money

greedy, math

Almost Sorted

bitmasks, data structures, dp

Maximums and Minimums

combinatorics, data structures, divide and conquer, number theory

Prefixes and Suffixes

constructive algorithms, strings, two pointers

Minimum Notation

data structures, greedy, math, sortings

Meeting on the Line

binary search, geometry, greedy, implementation, math, ternary search

Planets

data structures, greedy, sortings

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Kirei and the Linear Function

hashing, math

Guess the Cycle Size

interactive, probabilities

Friends and the Restaurant

greedy, sortings, two pointers

Jumping on Tiles

constructive algorithms, strings

Decode String

greedy, strings

Two Elevators

math

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers

Fishermen

flows, graph matchings, greedy

Red-Black Pepper

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

Letter Picking

constructive algorithms, dp, games, two pointers

Digital Logarithm

data structures, greedy, sortings

Best Permutation

constructive algorithms, greedy

Colored Balls: Revisited

brute force, greedy, implementation, sortings

Mainak and the Bleeding Polygon

binary search, geometry, implementation, math

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Late For Work (submissions are not allowed)

data structures, greedy, schedules, shortest paths

Almost Perfect

combinatorics, fft, math

Edge Split

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

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Mainak and Interesting Sequence

bitmasks, constructive algorithms, math

Mainak and Array

greedy, math

Moving Both Hands

dp, graphs, shortest paths

Lemper Cooking Competition

data structures

Kingdom of Criticism

data structures, dsu

Journey

dp, trees

Imitating the Key Tree

combinatorics, dsu, trees