Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Three Parts of the Array

binary search, data structures, two pointers

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Two-Paths

data structures, dp, trees

One Occurrence

data structures, divide and conquer

Covered Points Count

data structures, implementation, sortings

Equalize the Remainders

data structures, greedy, implementation

Good Subsegments

data structures

Leaving the Bar

brute force, data structures, geometry, greedy, math, sortings

Nastya and King-Shamans

binary search, data structures

Prince's Problem

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

Pencils and Boxes

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

NN country

binary search, data structures, trees

Arkady and Rectangles

data structures

Shark

brute force, data structures, dsu, trees

Bus of Characters

data structures, greedy, implementation

K Paths

combinatorics, data structures, dp, fft, math

Magic multisets

data structures

Addition on Segments

bitmasks, data structures, divide and conquer, dp

The Number Games

data structures, greedy, trees

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Mentors

binary search, data structures, implementation

Short Code

data structures, dp, greedy, strings, trees

Visible Black Areas

data structures, dsu, geometry, trees

Merge Equals

data structures, implementation

Tufurama

data structures

Lecture Sleep

data structures, dp, implementation, two pointers

Santa's Gift

data structures, trees

Pathwalks

data structures, dp, graphs

Minimize the error

data structures, greedy, sortings

Encryption (hard)

data structures, dp

Maximum Control (medium)

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

Castle Defense

binary search, data structures, greedy, two pointers

Almost Increasing Array

data structures, dp

Machine Learning

brute force, data structures

Cashback

data structures, dp, greedy, math

Cutlet

data structures, dp

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Buy a Ticket

data structures, graphs, shortest paths

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

Fafa and Array

data structures, greedy

Escape Through Leaf

data structures, dp, geometry

Recursive Queries

binary search, data structures, dfs and similar

Coins Exhibition

data structures, dp, math

Game with Tokens

data structures, games, implementation

Teodor is not a liar!

data structures, dp

Segments

data structures

Merge Equal Elements

constructive algorithms, data structures

May Holidays

data structures, trees

Riverside Curio

data structures, dp, greedy

Perfect Security

data structures, greedy, strings, trees

Producing Snow

binary search, data structures

SUM and REPLACE

brute force, data structures, dsu, number theory

Connected Components?

data structures, dfs and similar, dsu, graphs

Upside Down

data structures, string suffix structures, strings, trees

Jamie and Tree

data structures, trees

Jamie and To-do List

data structures, interactive, trees

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Physical Education Lessons

data structures, implementation, sortings

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Bash and a Tough Math Puzzle

data structures, number theory

Too Easy Problems

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

Fishes

data structures, graphs, greedy, probabilities, shortest paths

Mass Change Queries

data structures

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Colorful Points

data structures, greedy, implementation

Yet Another Maxflow Problem

data structures, flows, graphs

Almost Difference

data structures, math

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Maximum Questions

data structures, dp, strings

Remove Extra One

brute force, data structures, math

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Welcome home, Chtholly

data structures, dsu

Willem, Chtholly and Seniorious

data structures, probabilities

Eyes Closed

data structures, probabilities

Ralph And His Tour in Binary Country

brute force, data structures, trees

Subtree Minimum Query

data structures, trees

Credit Card

data structures, dp, greedy, implementation

Envy

data structures, dsu, graphs

Xor-MST

bitmasks, constructive algorithms, data structures

Ratings and Reality Shows

data structures, two pointers

Boxes And Balls

data structures, greedy

Berland.Taxi

data structures

Table Tennis

data structures, implementation

Tournament

data structures, graphs

Teams Formation

data structures, implementation

Ann and Books

data structures, flows, hashing

Danil and a Part-time Job

bitmasks, data structures, trees

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Delivery Club

binary search, data structures, dp

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Awards For Contestants

brute force, data structures, dp

Paths

data structures, number theory

The Untended Antiquity

data structures, hashing

Buy Low Sell High

constructive algorithms, data structures, greedy

Turn Off The TV

data structures, sortings

Yet Another Array Queries Problem

data structures, implementation