Lanterns

binary search, data structures, dp

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Cleaning

data structures, dp, greedy, math

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Program

data structures, dp, implementation, strings

Correct Placement

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

Strange Permutation

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

Power Sockets

binary search, data structures, greedy

Similar Sets

data structures, graphs, implementation

Berpizza

data structures, implementation

Bakery

data structures, dsu

LaIS

data structures, dp, greedy

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

13th Labour of Heracles

data structures, greedy, sortings, trees

My Beautiful Madness

data structures, trees

The Treasure of The Segments

binary search, data structures, greedy

Divide and Summarize

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

Range Diameter Sum

data structures, trees

Nim Shortcuts

data structures, games

Flip and Reverse

data structures, graphs, greedy

Forbidden Value

data structures, dp

Array Partition

binary search, data structures, greedy, two pointers

Game On Tree

data structures, dfs and similar, greedy, trees

Rating Compression

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

Line Distance

binary search, data structures, geometry

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Frequency Problem (Easy Version)

data structures, greedy

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Team-Building

data structures, dfs and similar, dsu, graphs

Sum

data structures, divide and conquer, dp, greedy

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Cheat and Win

bitmasks, data structures, games, trees

Greedy Shopping

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

Graph Subset Problem

constructive algorithms, data structures, graphs

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

Death DBMS

data structures, string suffix structures, strings, trees

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Complicated Computations

binary search, data structures, two pointers

String Reversal

data structures, greedy, strings

String Deletion

binary search, data structures, greedy, two pointers

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Fruit Sequences

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

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

ABBB

brute force, data structures, greedy, strings

Boring Card Game

data structures, greedy, trees

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Impressive Harvesting of The Orchard

data structures

Years

data structures, sortings

Virus

data structures, divide and conquer, dsu, graphs

Growing flowers

data structures

Boring Queries

data structures, math, number theory

Rescue Nibel!

combinatorics, data structures, sortings

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Equal Product

data structures, math, number theory, two pointers

Trash Problem

data structures, implementation

Split

binary search, data structures, dp, greedy

Graph and Queries

data structures, dsu, graphs, implementation, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Roads and Ramen

data structures, trees

Shurikens

data structures, greedy, implementation

Rainbow Triples

binary search, data structures, flows, greedy

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Searchlights

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

Discrete Centrifugal Jumps

data structures, dp, graphs

Three Sequences

constructive algorithms, data structures, greedy, math

Fixed Point Removal

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

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Reverse and Swap

binary search, bitmasks, data structures

Divide Square

data structures, geometry, implementation, sortings

Clear the Multiset

data structures, divide and conquer, dp, greedy

Zigzags

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

Yet Another Segments Subset

data structures, dp, graphs, sortings

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Controversial Rounds

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

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Good Subarrays

data structures, dp, math

Rainbow Rectangles

data structures, sortings, two pointers

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Omkar and Landslide

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

Bicolored Segments

data structures, dp, graph matchings, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

Captain Flint and Treasure

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

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Mixture

*special problem, data structures, geometry, math, sortings

Removing Leaves

data structures, greedy, implementation, trees

Strange Operation

combinatorics, data structures, dp

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Strange Addition

data structures, dp, matrices

Merging Towers

data structures, dsu, implementation, trees

Three Indices

brute force, data structures

Chess Strikes Back (hard version)

data structures, divide and conquer

Chess Strikes Back (easy version)

binary search, data structures