Unique Array

binary search, data structures, divide and conquer, dp, greedy

Division + LCP (hard version)

binary search, brute force, data structures, divide and conquer, hashing, string suffix structures, strings

Division + LCP (easy version)

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

Equal XOR Segments

binary search, data structures

Next and Prev

brute force, data structures, schedules

Fenwick Tree

combinatorics, data structures, dp, math, matrices, trees

Conference

data structures, flows

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Nene's Game

binary search, brute force, data structures, games, greedy

Inaccurate Subsequence Search

data structures, two pointers

Progressive Square

constructive algorithms, data structures, implementation, sortings

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Inversion Composition

constructive algorithms, data structures, greedy

Battle Cows

binary search, data structures, greedy

Nobody is needed

2-sat, data structures, dfs and similar, dp

GCD is Greater

brute force, data structures, math, number theory

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Kirill and Mushrooms

data structures, sortings

Farmer John's Favorite Intern

data structures, dp, flows, trees

Farmer John's Favorite Function

brute force, data structures, implementation, math

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Rudolf and k Bridges

binary search, data structures, dp, two pointers

Almost Certainly

*special problem, constructive algorithms, data structures, sortings

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Bitwise Paradox

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

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Pinball

binary search, data structures, implementation, math, two pointers

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Feed Cats

data structures, dp, sortings

LR-remainders

brute force, data structures, implementation, math, two pointers

Prefix Max Set Counting

data structures, dp, trees

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Digital Patterns

combinatorics, data structures, implementation, math

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Paint Charges

data structures, dp, greedy, math

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Find the Different Ones!

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

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Space Harbour

data structures, implementation, math, sortings

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Slimes

binary search, constructive algorithms, data structures, greedy, two pointers

Berserk Monsters

brute force, data structures, dsu, implementation, math

Mischievous Shooter

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

Sum of Progression

brute force, data structures, dp, implementation, math

Very Different Array

data structures, greedy, sortings, two pointers

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Wine Factory (Easy Version)

data structures, greedy

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Grouping Increases

data structures, dp, greedy

Blocking Elements

binary search, data structures, dp, implementation, two pointers

Minimize Inversions

constructive algorithms, data structures, greedy, implementation, sortings

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Happy Life in University

data structures, dfs and similar, greedy, trees

Greetings

data structures, divide and conquer, sortings

Romantic Glasses

data structures, greedy, math

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Palindromic Problem

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

Array Collapse

data structures, divide and conquer, dp, trees

Great City Saint Petersburg

data structures

Accumulator Apex

data structures, implementation, sortings

Sum of Digits of Sums

*special problem, binary search, data structures

Parallel Swaps Sort

constructive algorithms, data structures

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings

YetnotherrokenKeoard

data structures, implementation, strings

Maximize The Value

data structures, sortings

Field Should Not Be Empty

brute force, data structures, divide and conquer

Cyclic MEX

data structures, implementation, math, two pointers

Beautiful Tree

data structures, dfs and similar, graphs, implementation, trees

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

Array Game

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

Babysitting

2-sat, binary search, data structures, graphs, trees

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Collapsing Strings

data structures, strings, trees

Robot Queries

binary search, data structures, dp, implementation

Local Deletions

binary search, data structures, implementation

Unusual Entertainment

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

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Permutation Sorting

data structures, sortings

Ones and Twos

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

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

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

Colorful Constructive

constructive algorithms, data structures, greedy

A Growing Tree

data structures, dfs and similar, trees

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

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

Diamond Theft

data structures, greedy

Monocarp and the Set

combinatorics, data structures, math