Level Up

binary search, brute force, data structures, divide and conquer, implementation

Even Positions

constructive algorithms, data structures, greedy

Penacony

brute force, data structures, graphs, greedy, hashing

Decode

combinatorics, data structures, implementation, math

Let Me Teach You a Lesson (Hard Version)

data structures, dp, matrices, two pointers

Let Me Teach You a Lesson (Easy Version)

2-sat, data structures, dp, matrices, two pointers

Bouquet (Hard Version)

binary search, data structures, greedy, math, sortings, two pointers

Polygonal Segments

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

Catch the Mole(Hard Version)

binary search, data structures, dfs and similar, divide and conquer, interactive, trees

Catch the Mole(Easy Version)

binary search, data structures, dfs and similar, interactive, trees

Smithing Skill

brute force, data structures, dp, greedy, math, sortings, two pointers

Range Minimum Sum

binary search, brute force, data structures, divide and conquer, implementation

Wonderful Tree!

brute force, data structures, dfs and similar, dsu, greedy, trees

Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Permutation Problem (Simple Version)

binary search, brute force, combinatorics, data structures, math, number theory

Update Queries

data structures, greedy, sortings

Matrix Stabilization

brute force, data structures, greedy, sortings

Maximize the Largest Component (Hard Version)

data structures, dfs and similar, dp, dsu, implementation

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Final Boss

binary search, data structures

array-value

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

Swap Dilemma

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

Sorting Problem Again

binary search, data structures, sortings

Beauty of the mountains

brute force, data structures, implementation, math, number theory

Boring Day

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

Turtle and Paths on a Tree

data structures, dp, trees

Turtle and Intersected Segments

data structures, dsu, graphs, greedy

Yasya and the Mysterious Tree

bitmasks, data structures, dfs and similar, graphs, greedy, strings, trees

Field Division (easy version)

data structures, math, sortings

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Computing Machine

brute force, data structures, dp, greedy, implementation

Elections

data structures, greedy, implementation, math

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Nikita and LCM

brute force, data structures, dp, greedy, math, number theory, sortings

Remove Bridges

data structures, dfs and similar, dp, greedy, sortings, trees

Splittable Permutations

combinatorics, data structures, dfs and similar, greedy, math, trees

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

Chain Queries

binary search, data structures, dfs and similar, implementation, trees

Money Buys Less Happiness Now

data structures, greedy, sortings

Cutting Game

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

Beautiful Triple Pairs

combinatorics, data structures

Cat, Fox and the Lonely Array

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

XOUR

data structures, dsu, sortings

Unique Array

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

Shop Game

data structures, greedy, math, sortings

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Division + LCP (easy version)

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

Equal XOR Segments

binary search, data structures

Next and Prev

brute force, data structures, implementation

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, 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