Registration System

data structures, hashing, implementation

A and B and Compilation Errors

data structures, implementation, sortings

Sereja and Suffixes

data structures, dp

Number of Ways

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

Same Differences

data structures, hashing, math

Frog Jumps

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

Meximization

brute force, data structures, greedy, sortings

XXXXX

brute force, data structures, number theory, two pointers

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Bad Prices

data structures, implementation

Number of Pairs

binary search, data structures, math, two pointers

Pair of Topics

binary search, data structures, sortings, two pointers

Three Indices

brute force, data structures

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Yet Another Card Deck

brute force, data structures, implementation, trees

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Hotelier

brute force, data structures, implementation

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Xenia and Bit Operations

data structures, trees

Element Extermination

constructive algorithms, data structures, greedy

Polycarp Training

data structures, greedy, sortings

Little Girl and Maximum Sum

data structures, greedy, implementation, sortings

Berland Music

data structures, greedy, math, sortings

Good Subarrays

data structures, dp, math

Corrupted Array

constructive algorithms, data structures, greedy

Han Solo and Lazer Gun

brute force, data structures, geometry, implementation, math

Odd Swap Sort

data structures, math, sortings

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

ABBB

brute force, data structures, greedy, strings

Card Deck

data structures, greedy, math

Three Parts of the Array

binary search, data structures, two pointers

Epic Transformation

constructive algorithms, data structures, greedy

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Potions (Easy Version)

brute force, data structures, dp, greedy

Constructing the Array

constructive algorithms, data structures, sortings

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Social Network (hard version)

data structures, implementation

Delete Two Elements

data structures, dp, implementation, math, two pointers

Snacktower

data structures, implementation

Potions (Hard Version)

data structures, greedy

Accidental Victory

binary search, data structures, greedy

Journey Planning

data structures, dp, greedy, math, sortings

Subtract Operation

data structures, greedy, math, two pointers

Lecture Sleep

data structures, dp, implementation, two pointers

Box Fitting

binary search, bitmasks, data structures, greedy

Eating Candies

binary search, data structures, greedy, two pointers

Phoenix and Towers

constructive algorithms, data structures, greedy

Berland Regional

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

Orac and LCM

data structures, math, number theory

Game with string

data structures, implementation, math

Yet Another Walking Robot

data structures, implementation

Maximum width

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

Watchmen

data structures, geometry, math

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Misha and Changing Handles

data structures, dsu, strings

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Wonderful Coloring - 2

binary search, constructive algorithms, data structures, greedy

Seating Arrangements (easy version)

data structures, greedy, sortings

NEKO's Maze Game

data structures, dsu, implementation

Balanced Tunnel

data structures, sortings, two pointers

Prison Transfer

data structures, implementation

Equalize the Array

binary search, data structures, greedy, math, sortings

Color the Fence

data structures, dp, greedy, implementation

Reading Books (easy version)

data structures, greedy, sortings

Inversion Graph

data structures, dsu, graphs, math

Greg and Array

data structures, implementation

Prefix Flip (Hard Version)

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

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

Friends and Gifts

constructive algorithms, data structures, math

Beautiful Numbers

data structures, implementation, math, two pointers

Distinct Characters Queries

data structures

Diluc and Kaeya

data structures, dp, hashing, number theory

Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Grandma Capa Knits a Scarf

brute force, data structures, greedy, strings, two pointers

Karen and Coffee

binary search, data structures, implementation

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Eugene and an array

binary search, data structures, implementation, two pointers

Bad Sequence

data structures, greedy

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Integers Shop

data structures, greedy, implementation

Minimum Grid Path

brute force, data structures, greedy, math

2-Letter Strings

data structures, math, strings

Cells Not Under Attack

data structures, math

Stack of Presents

data structures, implementation

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Stone Age Problem

data structures, implementation

Knight Tournament

data structures, dsu

Alice and the Cake

data structures, greedy, implementation, sortings

Build a Contest

data structures, implementation

MEX maximizing

data structures, greedy, implementation, math

Table Tennis

data structures, implementation

Array Destruction

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

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

13th Labour of Heracles

data structures, greedy, sortings, trees

Chat Order

*special problem, binary search, constructive algorithms, data structures, sortings

Escape from Stones

constructive algorithms, data structures, implementation, two pointers

Sereja and Brackets

data structures, schedules

Stripe

data structures, implementation

Candies!

data structures, dp, implementation, math