Registration System

data structures, hashing, implementation

ICPC Balloons

data structures, implementation

Same Differences

data structures, hashing, math

Sereja and Suffixes

data structures, dp

A and B and Compilation Errors

data structures, implementation, sortings

Advantage

data structures, implementation, sortings

Number of Ways

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

Word Game

data structures, implementation

Remove Prefix

data structures, greedy, implementation

Odd Queries

data structures, implementation

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Number of Pairs

binary search, data structures, math, two pointers

Frog Jumps

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

XXXXX

brute force, data structures, number theory, two pointers

Pair of Topics

binary search, data structures, sortings, two pointers

Bad Prices

data structures, implementation

Restoring the Duration of Tasks

data structures, greedy, implementation

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Double Strings

brute force, data structures, strings

Good Subarrays

data structures, dp, math

Little Girl and Maximum Sum

data structures, greedy, implementation, sortings

Meximization

brute force, data structures, greedy, sortings

Xenia and Bit Operations

data structures, trees

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Three Indices

brute force, data structures

Progressive Square

constructive algorithms, data structures, implementation, sortings

YetnotherrokenKeoard

data structures, implementation, strings

Eating Candies

binary search, data structures, greedy, two pointers

Planets

data structures, greedy, sortings

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Powering the Hero (easy version)

data structures, greedy

Yet Another Card Deck

brute force, data structures, implementation, trees

Minimize Inversions

constructive algorithms, data structures, greedy, implementation, sortings

Also Try Minecraft

data structures, dp, implementation

Corrupted Array

constructive algorithms, data structures, greedy

Remove Two Letters

data structures, greedy, hashing, strings

Train and Queries

data structures, greedy

Powering the Hero (hard version)

data structures, greedy

Potions (Easy Version)

brute force, data structures, dp, greedy

Potions (Hard Version)

data structures, greedy

Interesting Sum

brute force, data structures, greedy, math, sortings

Epic Transformation

constructive algorithms, data structures, greedy

Berland Music

data structures, greedy, math, sortings

Element Extermination

constructive algorithms, data structures, greedy

Odd Swap Sort

data structures, math, sortings

Polycarp Training

data structures, greedy, sortings

Three Parts of the Array

binary search, data structures, two pointers

Han Solo and Lazer Gun

brute force, data structures, geometry, implementation, math

Delete Two Elements

data structures, dp, implementation, math, two pointers

Hotelier

brute force, data structures, implementation

Very Different Array

data structures, greedy, sortings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

ABBB

brute force, data structures, greedy, strings

Flower City Fence

binary search, data structures, implementation, sortings

Block Towers

data structures, greedy, sortings

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Snacktower

data structures, implementation

Lecture Sleep

data structures, dp, implementation, two pointers

Binary Inversions

data structures, greedy, math

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

Accidental Victory

binary search, data structures, greedy

Nene's Game

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

Romantic Glasses

data structures, greedy, math

Find the Different Ones!

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

Matryoshkas

data structures, greedy, sortings

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Card Deck

data structures, greedy, math

Dora and Search

constructive algorithms, data structures, two pointers

Rudolf and the Another Competition

constructive algorithms, data structures, dp, greedy, sortings

3SUM Closure

brute force, data structures

Subsequence Addition (Easy Version)

brute force, data structures, dp, greedy, implementation, sortings

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Subtract Operation

data structures, greedy, math, two pointers

Constructing the Array

constructive algorithms, data structures, sortings

Mystic Permutation

data structures, greedy

Stone Age Problem

data structures, implementation

2-Letter Strings

data structures, math, strings

Grouping Increases

data structures, dp, greedy

Phoenix and Towers

constructive algorithms, data structures, greedy

Social Network (hard version)

data structures, implementation

Karen and Coffee

binary search, data structures, implementation

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Box Fitting

binary search, bitmasks, data structures, greedy

Greg and Array

data structures, implementation

Minimum Notation

data structures, greedy, math, sortings

Berland Regional

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

Orac and LCM

data structures, math, number theory

2^Sort

data structures, dp, sortings, two pointers

Three Sevens

brute force, data structures, greedy, implementation

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Misha and Changing Handles

data structures, dsu, strings

Maximum width

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

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Equalize the Array

binary search, data structures, greedy, math, sortings

Journey Planning

data structures, dp, greedy, math, sortings

Digital Logarithm

data structures, greedy, sortings

Watchmen

data structures, geometry, math

Wonderful Coloring - 2

binary search, constructive algorithms, data structures, greedy

Chat Order

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

Balanced Tunnel

data structures, sortings, two pointers