Cover in Water

constructive algorithms, greedy, implementation, strings

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Queue Sort

greedy, implementation, sortings

Yarik and Musical Notes

hashing, math, number theory

Yarik and Array

dp, greedy, two pointers

250 Thousand Tons of TNT

brute force, implementation, number theory

Game with Integers

games, math, number theory

Vova Escapes the Matrix

brute force, dfs and similar, divide and conquer, shortest paths

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Absolute Beauty

greedy, math

Colorful Grid

constructive algorithms

Milena and Admirer

greedy, math

Milica and String

brute force, implementation, strings

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Bracket Xoring

constructive algorithms, greedy, implementation, math

Permutation Sorting

data structures, sortings

Ones and Twos

binary search, data structures, divide and conquer, math, two pointers

Matching Arrays

binary search, constructive algorithms, greedy, sortings

AB Flipping

greedy, strings, two pointers

Jagged Swaps

sortings

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Fancy Arrays

combinatorics, dp, math, matrices

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Points and Minimum Distance

greedy, math, sortings

Treasure Chest

math

Two Out of Three

constructive algorithms

Secret Sport

implementation, strings

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Colorful Constructive

constructive algorithms, data structures, greedy

Freedom of Choice

brute force, greedy, implementation

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Anonymous Informant

brute force, dfs and similar, graphs, implementation

A Growing Tree

data structures, dfs and similar, trees

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Suspicious logarithms

binary search, brute force, math

Smilo and Monsters

binary search, constructive algorithms, greedy, sortings, two pointers

Deja Vu

brute force, math, sortings

Sorting with Twos

constructive algorithms, sortings

Qingshan Loves Strings

constructive algorithms, implementation

Doremy's Paint 3

constructive algorithms

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Game of Stacks

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

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Qingshan Loves Strings 2

constructive algorithms, greedy, implementation

Minimum Segments

constructive algorithms

Good Colorings

binary search, constructive algorithms, graphs, interactive

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Time Travel

binary search, graphs, shortest paths

Diamond Theft

data structures, greedy

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Monocarp and the Set

combinatorics, data structures, math

Decreasing String

implementation, strings

Fear of the Dark

binary search, geometry, math

Sum of Three

brute force, constructive algorithms, math

Deterministic Scheduling for Extended Reality over 5G and Beyond

*special problem

Hard Design

greedy, implementation, math

Counting Rhyme

dp, math, number theory

Medium Design

brute force, data structures, dp, greedy, sortings

Haunted House

binary search, greedy, math, two pointers

Simple Design

brute force, greedy, math

Dances (Hard Version)

binary search, greedy, sortings, two pointers

Dances (Easy version)

binary search, greedy, two pointers

You Are So Beautiful

data structures

Look Back

bitmasks, greedy

In Love

data structures, greedy

Raspberries

dp, math

Chemistry

strings

Morning

math

Two Permutations (Hard Version)

constructive algorithms

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Card Game

brute force, greedy

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Increasing Sequence

greedy

Anya and the Mysterious String

binary search, data structures

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

Block Sequence

dp

Divide and Equalize

math, number theory

Perfect Square

brute force, implementation

Three Threadlets

math

Don't Try to Count

brute force, strings

Last Man Standing

brute force, data structures, number theory

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Make it Alternating

combinatorics, dp, greedy

Chips on the Board

constructive algorithms, greedy

Rigged!

greedy

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Vasilije Loves Number Theory

brute force, math, number theory

Iva & Pav

binary search, bitmasks, data structures, greedy

Reverse Madness

data structures, greedy