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

Mahmoud and Ehab and the final stage

data structures, strings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Arkady and a Nobody-men

data structures, dfs and similar, trees

Polycarp's phone book

data structures, implementation, sortings

Nagini

binary search, data structures

Marvolo Gaunt's Ring

brute force, data structures, dp

Lada Malina

data structures, geometry

Boredom

data structures

Goodbye Souvenir

data structures, divide and conquer

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

Dog Show

constructive algorithms, data structures, greedy

Preparing for Merge Sort

binary search, data structures

Random Query

data structures, math, probabilities, two pointers

Monitor

binary search, data structures

Four Segments

brute force, data structures, dp

Fire in the City

binary search, data structures

Driving Test

data structures, dp, greedy

Two TVs

data structures, greedy, sortings

Vitya and Strange Lesson

binary search, data structures

Destiny

data structures, probabilities

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Diverging Directions

data structures, dfs and similar, trees

Functions On The Segments

data structures

The Festive Evening

data structures, implementation

Caramel Clouds

data structures, dp, sortings

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

The Bakery

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

Bamboo Partition

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

Cards Sorting

data structures, implementation, sortings

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Best Edge Weight

data structures, dfs and similar, graphs, trees

DNA Evolution

data structures, strings

String Reconstruction

data structures, greedy, sortings, strings

Minimal Labels

data structures, dfs and similar, graphs, greedy

Okabe and Boxes

data structures, greedy, trees

Mister B and PR Shifts

data structures, implementation, math

Card Game Again

binary search, data structures, number theory, two pointers

Multicolored Cars

data structures, implementation

MEX Queries

binary search, data structures, trees

Choosing The Commander

bitmasks, data structures, trees

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Karen and Coffee

binary search, data structures, implementation

Karen and Cards

binary search, combinatorics, data structures, geometry

Bipartite Checking

data structures, dsu, graphs

Army Creation

binary search, data structures

Vladik and Entertaining Flags

data structures, dsu, graphs

Hitchhiking in the Baltic States

data structures, dp

Array Division

binary search, data structures, implementation

Average Sleep Time

data structures, implementation, math

Periodic RMQ Problem

data structures

April Fools' Problem (hard)

binary search, data structures, flows

Heidi and Library (medium)

data structures, greedy

Cut the pie

binary search, data structures, geometry

Beautiful fountains rows

data structures

Aquarium decoration

data structures, greedy, two pointers

Fountains

binary search, data structures, implementation

T-shirt buying

data structures, implementation

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Mice and Holes

data structures, dp, greedy, sortings

Array Queries

brute force, data structures, dp

Broken BST

data structures, dfs and similar

Minimal string

data structures, greedy, strings

Sequence Recovery

bitmasks, data structures, greedy

Bank Hacking

constructive algorithms, data structures, dp, trees