Eels

data structures

Multidimensional Queries

bitmasks, data structures

Intersection of Permutations

data structures

Great Vova Wall (Version 2)

data structures, implementation

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

New Year Presents

constructive algorithms, data structures

King Kog's Reception

data structures

Ehab and a weird weight formula

data structures, trees

Beautiful Matrix

combinatorics, data structures, dp

The Fair Nut and Amusing Xor

data structures

The Fair Nut and Rectangles

data structures, dp, geometry

The Fair Nut's getting crazy

data structures, implementation

Max Mex

data structures, trees

The Fair Nut and the Best Path

data structures, dp, trees

Palindromic Magic

data structures, hashing, strings

Katya and Segments Sets

data structures, interactive, sortings

Pictures with Kittens (hard version)

data structures, dp

Array Game

data structures, games

Vasya and a Tree

data structures, trees

Yet Another LCP Problem

data structures, string suffix structures

Berland Fair

binary search, brute force, data structures, greedy

Getting Deals Done

binary search, data structures

Cloud Computing

data structures, greedy

Berkomnadzor

data structures, greedy

Binary Numbers AND Sum

data structures, implementation, math

String Journey

data structures, dp, string suffix structures

Company

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

TV Shows

data structures, greedy, implementation, sortings

Multiplicity

data structures, dp, implementation, math, number theory

Balls and Pockets

data structures

Split the Tree

binary search, data structures, dp, greedy, trees

Detect Robots

data structures, strings

Take Metro

brute force, data structures, graphs

Check Transcription

brute force, data structures, hashing, strings

Distinctification

data structures, dsu, greedy

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Moonwalk challenge

data structures, strings, trees

AI robots

data structures

Last chance

data structures, flows, graph matchings, graphs, trees

DFS

data structures

Deduction Queries

data structures, dsu

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

Leaf Sets

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

Petya and Array

data structures, divide and conquer, two pointers

Ray in the tube

data structures, divide and conquer, dp, math

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Glider

binary search, data structures, two pointers

Coffee Break

binary search, data structures, greedy, two pointers

Summer Oenothera Exhibition

data structures

You Are Given a Tree

data structures, dp, trees

Timetable

constructive algorithms, data structures, greedy, math

Security

data structures, string suffix structures

Maximum Reduction

combinatorics, data structures, math

Intervals of Intervals

binary search, data structures, two pointers

Putting Boxes Together

data structures

Order book

combinatorics, data structures, greedy

Pisces

data structures, flows, trees

Array Restoration

constructive algorithms, data structures

Raining season

data structures, divide and conquer, trees

The Tree

data structures

The Wu

bitmasks, brute force, data structures

Store

data structures

Dominant Indices

data structures, dsu, trees

Ants

2-sat, data structures, trees

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