Catch Overflow!

data structures, expression parsing, implementation

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

Ehab and the Expected XOR Problem

bitmasks, constructive algorithms

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

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Nauuo and Cards

greedy, implementation

Xor Permutations

constructive algorithms, math

Anagram Paths

dp, implementation, trees

And Reachability

bitmasks, dp

Good Triple

brute force, two pointers

Increasing by Modulo

binary search, greedy

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

Two Arrays and Sum of Functions

greedy, math, sortings

Almost All Divisors

math, number theory

Indecisive Taxi Fee

data structures, graphs, shortest paths

Magical Permutation

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

Mysterious Code

dp, strings

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Power Transmission (Easy Edition)

brute force, geometry

Cat Party (Hard Edition)

data structures, implementation

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

Minimum Array

binary search, data structures, greedy

N Problems During K Days

constructive algorithms, greedy, math

Increasing Subsequence (hard version)

greedy

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

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Delivery Oligopoly

brute force, dp, graphs

Guess the Root

brute force, interactive, math

Beautiful Array

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

Minimum Possible LCM

brute force, greedy, math, number theory

Shovels Shop

dp, greedy, sortings

Two Teams

data structures, implementation, sortings

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Serval and Snake

binary search, brute force, interactive

Serval and Rooted Tree

binary search, dfs and similar, dp, greedy, trees

Serval and Parenthesis Sequence

greedy, strings

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

Neko does Maths

brute force, math, number theory

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Number of Components

combinatorics, data structures, dp, math

Stas and the Queue at the Buffet

greedy, math, sortings

Problem for Nazar

constructive algorithms, math

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

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

Dirty Deeds Done Dirt Cheap

greedy, sortings

Crazy Diamond

constructive algorithms, sortings

Born This Way

binary search, brute force, two pointers

Zigzag Game

games, interactive

Rainbow Coins

interactive

Palindrome XOR

dfs and similar, graphs

Thanos Nim

games

Chladni Figure

brute force, strings

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

Tree Diameter

bitmasks, graphs, interactive

Two Merged Sequences

dp, greedy

Graph Without Long Directed Paths

dfs and similar, graphs

Median String

bitmasks, math, number theory, strings

Pink Floyd

graphs, interactive

Foreigner

dp

U2

geometry

Lynyrd Skynyrd

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

The Beatles

brute force, math

Privatization of Roads in Treeland

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Same Sum Blocks (Hard)

data structures, greedy