Cut and Stick

binary search, data structures, greedy, probabilities, sortings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Corrupted Array

constructive algorithms, data structures, greedy

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Yet Another Card Deck

brute force, data structures, implementation, trees

Optimal Encoding

brute force, data structures

Complete the MST

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

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Epic Transformation

constructive algorithms, data structures, greedy

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Subset Trick

binary search, data structures

Tiles for Bathroom

data structures, sortings, two pointers

Graph Coloring

data structures, graphs, interactive

Minimum Grid Path

brute force, data structures, greedy, math

Christmas Game

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

Planar Reflections

brute force, data structures, dp

Box Fitting

binary search, bitmasks, data structures, greedy

Square-free division (hard version)

data structures, dp, greedy, math, number theory, two pointers

Square-free division (easy version)

data structures, dp, greedy, math, number theory, two pointers

Meximization

brute force, data structures, greedy, sortings

Squares

constructive algorithms, data structures, dp, graphs, trees

Qingshan and Daniel

brute force, data structures, greedy, implementation

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Maximum width

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

Card Deck

data structures, greedy, math

Ruler Of The Zoo

brute force, data structures

Yuezheng Ling and Dynamic Tree

data structures, trees

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Old Floppy Drive

binary search, data structures, math

Equalize the Array

binary search, data structures, greedy, math, sortings

Accidental Victory

binary search, data structures, greedy

Flower Shop

*special problem, data structures, fft, math

Build From Suffixes

*special problem, combinatorics, data structures

Painting Numbers

*special problem, data structures, greedy, number theory

Dogecoin

*special problem, *special problem, binary search, data structures

Palindromic Doubles

*special problem, data structures, dp

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Pairs of Paths

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

Max Median

binary search, data structures, dp

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Exam

data structures, string suffix structures, trees

Skyline Photo

data structures, divide and conquer, dp

Playlist

data structures, dsu, implementation, shortest paths

Sorting Books

data structures, dp, greedy

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Tournaments

data structures, greedy

Nezzar and Binary String

data structures, greedy

Minimum Difference

data structures, hashing, sortings, two pointers

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