Ain and Apple Tree

binary search, constructive algorithms, greedy, math, trees

Apple Tree Traversing

brute force, dfs and similar, greedy, implementation, trees

Baudelaire (hard version)

binary search, dfs and similar, divide and conquer, implementation, interactive, trees

Baudelaire (easy version)

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

Goblin

dfs and similar, dp, dsu, greedy, math

Wolf

binary search, greedy, math

Modulo 3

data structures, divide and conquer, dsu, graphs, trees

Numbers and Strings

binary search, brute force, dfs and similar, dp, implementation, math

Unpleasant Strings

binary search, dp, greedy, strings

Maximize Nor

bitmasks, data structures, dp, implementation, sortings

Keep the Sum

constructive algorithms, implementation, two pointers

Local Construction

constructive algorithms, dfs and similar, implementation, two pointers

Median Splits

binary search, greedy, implementation, sortings

Shoo Shatters the Sunshine

combinatorics, dp, trees

Kia Bakes a Cake

data structures, dp, greedy, trees

Mani and Segments

data structures, implementation, sortings, two pointers

23 Kingdom

binary search, brute force, data structures, greedy, ternary search, two pointers

Quartet Swapping

brute force, data structures, divide and conquer, greedy, sortings

Lost Luggage

dp, flows

Clearing the Snowdrift

data structures, dfs and similar, dp, greedy

Homework

bitmasks, math, matrices

Bermuda Triangle

chinese remainder theorem, geometry, implementation, math, number theory

Baggage Claim

combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees

Wonderful XOR Problem

bitmasks, combinatorics, dp, fft, math

Wonderful Guessing Game

bitmasks, constructive algorithms, interactive

Wonderful Impostors

data structures, implementation, two pointers

Wonderful Teddy Bears

greedy, implementation, sortings

Wonderful Lightbulbs

combinatorics, constructive algorithms, math

Wonderful City

dp, implementation

La Vaca Saturno Saturnita

binary search, brute force, math, number theory

Chimpanzini Bananini

data structures, implementation, math

Trulimero Trulicina

constructive algorithms

Shorten the Array

binary search, bitmasks, data structures, dfs and similar, greedy, strings, trees, two pointers

Hackers and Neural Networks

bitmasks, brute force, greedy

Andryusha and CCB

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

She knows...

combinatorics, constructive algorithms, graphs, math

Mishkin Energizer

brute force, constructive algorithms, greedy, implementation, strings

Gleb and Boating

brute force, constructive algorithms, data structures, dp, graphs, greedy, math, number theory, shortest paths

Igor and Mountain

binary search, brute force, dp

Dining Hall

data structures, greedy, implementation, sortings

Black Cat Collapse

Conditional Operators

constructive algorithms

Key of Like (Hard Version)

dp, math, probabilities

Key of Like (Easy Version)

dp, games, math, probabilities

Canteen (Hard Version)

binary search, data structures, dp, flows, greedy, two pointers

Canteen (Easy Version)

binary search, data structures, flows, greedy, two pointers

Simple Permutation

constructive algorithms, number theory

Online Palindrome

brute force, constructive algorithms, interactive

Zebra-like Numbers

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy, math

Even String

brute force, combinatorics, dp, math, strings

Serval and Colorful Array (Hard Version)

data structures, greedy

Serval and Colorful Array (Easy Version)

data structures, greedy

Serval and Modulo

constructive algorithms, math, number theory

Serval and Kaitenzushi Buffet

data structures, graph matchings, greedy

Serval and The Formula

bitmasks, constructive algorithms, dp, greedy

Turtle and Nediam 2

dp, greedy

Wish Upon a Satellite (Hard Version)

data structures, dp

Wish Upon a Satellite (Easy Version)

dp, games

Skyscape

constructive algorithms, data structures, greedy

Blossom

binary search, combinatorics, dp, implementation, math, two pointers

Arcology On Permafrost

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

Floor or Ceil

brute force, greedy

Hard Formula (Hard Version)

math

Hard Formula

math, number theory

Hot Matrix

constructive algorithms, math

Quantifier

combinatorics, dp, implementation

MST in Modulo Graph

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

Quaternary Matrix

bitmasks, constructive algorithms, greedy, implementation, matrices

Balancing

greedy

Math Division

bitmasks, dp, math, probabilities

Order Statistics

*special problem, binary search

Card Flip

*special problem

Best Runner

*special problem

Strong Connectivity Strikes Back

*special problem, constructive algorithms, graphs

Cute Subsequences

*special problem, sortings

Dreaming Is Not Harmful

*special problem

Arithmetic Exercise

*special problem, data structures, dp, greedy

Alice, Bob, And Two Arrays

*special problem, data structures, dp, games

Scammy Game Ad

dp, greedy, implementation

RGB Walking

bitmasks, chinese remainder theorem, dfs and similar, graphs, number theory

AND x OR

bitmasks, constructive algorithms, dp

Another Folding Strip

combinatorics, constructive algorithms, data structures, divide and conquer, dp, greedy, math

Maximum Polygon

brute force, data structures, greedy, implementation, math

Binary Subsequence Value Sum

combinatorics, data structures, dp, fft, math, matrices

Finding OR Sum

bitmasks, constructive algorithms, implementation, interactive, math

Beautiful Sequence Returns

binary search, brute force, data structures, implementation

XOR Matrix

bitmasks, combinatorics, dp, implementation, math

Equalization

bitmasks, brute force, dp, graphs, math

Game With Triangles: Season 2

dp, geometry

Counting Necessary Nodes

bitmasks, divide and conquer, greedy, implementation, math

Empty Triangle

geometry, interactive, probabilities

Can You Reach There?

Book Sorting

Gathering Sharks

Squares on Grid Lines

Secret Lilies and Roses

interactive

Corrupted File

Hold the Star

Minus Operator

interactive

Tower of Hanoi