Long Colorful Strip

dp

Short Colorful Strip

combinatorics, dfs and similar, dp

Destroy it!

dp, implementation, sortings

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Nauuo and Bug

data structures

Nauuo and ODT

data structures

Nauuo and Portals

constructive algorithms

Nauuo and Pictures (hard version)

dp, probabilities

Nauuo and Pictures (easy version)

dp, probabilities

Xor Permutations

constructive algorithms, math

Anagram Paths

dp, implementation, trees

And Reachability

bitmasks, dp

Low Budget Inception

brute force, geometry

Scalar Queries

combinatorics, data structures, math, sortings

Range Deleting

binary search, combinatorics, data structures, two pointers

Vicky's Delivery Service

data structures, dsu, graphs, hashing

The LCMs Must be Large

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

Cute Sequences

binary search, brute force, greedy, math

Microtransactions (hard version)

binary search, greedy, implementation

Microtransactions (easy version)

binary search, greedy

Indecisive Taxi Fee

data structures, graphs, shortest paths

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Mysterious Code

dp, strings

Density of subarrays

dp, math

Strange device

binary search, interactive, math, trees

Winding polygonal line

constructive algorithms, geometry, greedy, math

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

The minimal unique substring

constructive algorithms, math, strings

Inverse of Rows and Columns

brute force, constructive algorithms

Maximum Balanced Circle

constructive algorithms, dp, greedy, two pointers

Optimizer

graphs, greedy, hashing, implementation

Card Bag

dp, math, probabilities

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Match Points

binary search, greedy, sortings, ternary search, two pointers

Delivery Oligopoly

brute force, dp, graphs

Guess the Root

brute force, interactive, math

Minimum Possible LCM

brute force, greedy, math, number theory

Shovels Shop

dp, greedy, sortings

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Serval and Snake

binary search, brute force, interactive

Neko Rules the Catniverse (Large Version)

bitmasks, dp, matrices

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Neko and Aki's Prank

dp, greedy, trees

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Number of Components

combinatorics, data structures, dp, math

Election Promises

games, graphs

Abandoning Roads

brute force, dp, graphs, greedy

Tree Generator™

data structures, implementation, trees

Three Religions

dp, implementation, strings

Holy Diver

data structures

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Foo Fighters

bitmasks, constructive algorithms

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Zigzag Game

games, interactive

Rainbow Coins

interactive

Palindrome XOR

dfs and similar, graphs

Thanos Nim

games

Satanic Panic

dp, geometry

Zoning Restrictions

dp, flows, graphs

Leaf Partition

dp, trees

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Frog Jumping

dfs and similar, math, number theory

Two Merged Sequences

dp, greedy

Pink Floyd

graphs, interactive

Foreigner

dp

U2

geometry

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

Double Tree

data structures, divide and conquer, shortest paths, trees

Extending Set of Points

data structures, divide and conquer, dsu

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Dish Shopping

data structures, divide and conquer

Maximize Mex

flows, graph matchings, graphs

Steps to One

dp, math, number theory, probabilities

Matches Are Not a Child's Play

data structures, trees

Train Car Selection

data structures, greedy

Cooperative Game

constructive algorithms, interactive, number theory

Museums Tour

dp, graphs, implementation

Nastya Hasn't Written a Legend

binary search, data structures

Greedy Subsequences

data structures, dp, trees

Clear the String

dp

Knapsack

dfs and similar, dp, greedy

Stressful Training

binary search, greedy

Most Dangerous Shark

data structures, dp, two pointers

String Multiplication

dp, greedy, strings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Legendary Tree

binary search, interactive, trees

Isolation

data structures, dp

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Wrong Answer

constructive algorithms

Secret Letters

data structures, dp, greedy

The very same Munchhausen

brute force

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Compress String

dp, strings

Once in a casino

constructive algorithms, greedy, implementation, math