Addition Robot

data structures, math, matrices

Performance Review

data structures

Trip to Saint Petersburg

data structures

Too Many Segments (hard version)

data structures, greedy, sortings

Balanced Playlist

binary search, data structures, implementation

Optimal Subsequences (Hard Version)

data structures, greedy

Wi-Fi

data structures, dp, greedy

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Let Them Slide

data structures, implementation

Restore Permutation

binary search, data structures, greedy, implementation

Remainder Problem

brute force, data structures, implementation

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

White Lines

brute force, data structures, dp, implementation, two pointers

OpenStreetMap

data structures, two pointers

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Heidi and the Turing Test (Medium)

data structures

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Range Deleting

binary search, combinatorics, data structures, two pointers

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Two Teams

data structures, implementation, sortings

Number of Components

combinatorics, data structures, dp, math

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

Same Sum Blocks (Hard)

data structures, greedy

Nastya Hasn't Written a Legend

binary search, data structures

Array and Segments (Hard version)

data structures, implementation

Lunar New Year and Red Envelopes

data structures, dp

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Great Vova Wall (Version 2)

data structures, implementation

The Fair Nut and the Best Path

data structures, dp, trees

Pictures with Kittens (hard version)

data structures, dp

Vasya and a Tree

data structures, trees

Getting Deals Done

binary search, data structures

Cloud Computing

data structures, greedy

TV Shows

data structures, greedy, implementation, sortings

Check Transcription

brute force, data structures, hashing, strings

AI robots

data structures

Petya and Array

data structures, divide and conquer, two pointers

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Order book

combinatorics, data structures, greedy

The Wu

bitmasks, brute force, data structures

Equalize the Remainders

data structures, greedy, implementation

Pencils and Boxes

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

Shark

brute force, data structures, dsu, trees

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

Short Code

data structures, dp, greedy, strings, trees

Tufurama

data structures

Pathwalks

data structures, dp, graphs

Maximum Control (medium)

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

Castle Defense

binary search, data structures, greedy, two pointers

Cashback

data structures, dp, greedy, math

Buy a Ticket

data structures, graphs, shortest paths

Teodor is not a liar!

data structures, dp

Segments

data structures

Merge Equal Elements

constructive algorithms, data structures

Perfect Security

data structures, greedy, strings, trees

SUM and REPLACE

brute force, data structures, dsu, number theory

Connected Components?

data structures, dfs and similar, dsu, graphs

Jamie and To-do List

data structures, interactive, 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

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Colorful Points

data structures, greedy, implementation

Almost Difference

data structures, math

Maximum Questions

data structures, dp, strings

Letters Removing

data structures, strings

Segments Removal

data structures, dsu, flows, implementation, two pointers

Ralph And His Tour in Binary Country

brute force, data structures, trees

Credit Card

data structures, dp, greedy, implementation

Danil and a Part-time Job

bitmasks, data structures, trees

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

High Cry

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

Turn Off The TV

data structures, sortings

Yet Another Array Queries Problem

data structures, implementation

Mahmoud and Ehab and the function

binary search, data structures, sortings

Boredom

data structures

Rooter's Song

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

Dog Show

constructive algorithms, data structures, greedy

Random Query

data structures, math, probabilities, two pointers

Monitor

binary search, data structures

Four Segments

brute force, data structures, dp

Driving Test

data structures, dp, greedy

Vitya and Strange Lesson

binary search, data structures

Leha and another game about graph

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

Diverging Directions

data structures, dfs and similar, trees

The Bakery

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

DNA Evolution

data structures, strings

Mister B and PR Shifts

data structures, implementation, math

Card Game Again

binary search, data structures, number theory, two pointers

Choosing The Commander

bitmasks, data structures, trees