Beautiful Matrix

combinatorics, data structures, dp

Tokitsukaze and Beautiful Subsegments

data structures

Raging Thunder

data structures, divide and conquer, implementation

Summer Homework

data structures, math

DFS

data structures

BRT Contract

data structures

Sasha and a Very Easy Test

data structures, number theory

GCD is Greater

brute force, data structures, math, number theory

Bug in Code

binary search, data structures, sortings

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Train Car Selection

data structures, greedy

Awards For Contestants

brute force, data structures, dp

Fedya the Potter Strikes Back

data structures, strings

Ehab and a weird weight formula

data structures, trees

Jamie and To-do List

data structures, interactive, trees

Encryption (hard)

data structures, dp

...Wait for it...

data structures, dsu, trees

Colored Tree

data structures, trees

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

New Year Presents

constructive algorithms, data structures

Timofey and our friends animals

data structures, divide and conquer, dsu

Fetch the Treasure

brute force, data structures, graphs, shortest paths

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Last Man Standing

brute force, data structures, number theory

Distance to the Path

data structures, dfs and similar, trees

Ratings and Reality Shows

data structures, two pointers

Nastya and CBS

brute force, data structures, hashing

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Berkomnadzor

data structures, greedy

Chess Strikes Back (hard version)

data structures, divide and conquer

Big Problems for Organizers

data structures, graphs, trees

Phys Ed Online

data structures, dp, greedy

Double Tree

data structures, divide and conquer, shortest paths, trees

Matches Are Not a Child's Play

data structures, trees

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Sweets

*special problem, data structures, implementation

Field Should Not Be Empty

brute force, data structures, divide and conquer

Array Game

data structures, games

Game On Tree

data structures, dfs and similar, greedy, trees

Huffman Coding on Segment

data structures, greedy

Cutting a Fence

binary search, data structures, dsu

LuoTianyi and the Function

data structures

Bear and Cavalry

data structures, divide and conquer, dp

Half-decay tree

data structures, divide and conquer, dp, math, probabilities

Fence

binary search, data structures, string suffix structures

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Optimizer

data structures, greedy, sortings

Exam

data structures, string suffix structures, trees

Noble Knight's Path

data structures, trees

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

Intervals of Intervals

binary search, data structures, two pointers

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Robots protection

data structures

Arkady and a Nobody-men

data structures, dfs and similar, trees

Squid Game

data structures, dfs and similar, greedy, trees

Nagini

binary search, data structures

Great City Saint Petersburg

data structures

Edge Queries

data structures, dfs and similar, dp, dsu, graphs, trees

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Beautiful fountains rows

data structures

Magic Tree

*special problem, data structures, dp, trees

Decoding of Integer Sequences

*special problem, data structures, implementation

Bitwise Paradox

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

Equal LCM Subsets

data structures, math, number theory

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Location

data structures, dp, math, number theory

Tiles for Bathroom

data structures, sortings, two pointers

Maximum Waterfall

data structures, dp, graphs, sortings

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Almost Sorted

bitmasks, data structures, dp

The Awesomest Vertex

data structures, dfs and similar

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Coins Exhibition

data structures, dp, math

Dividing Kingdom

binary search, brute force, data structures

Qingshan and Daniel

brute force, data structures, greedy, implementation

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Nim Shortcuts

data structures, games

Nauuo and Bug

data structures

Dasha and Photos

brute force, data structures, dp, implementation

Try Booking

data structures, divide and conquer

Omkar and Time Travel

data structures, math

Gripping Story

binary search, data structures, sortings

Most Dangerous Shark

data structures, dp, two pointers

Forbidden Value

data structures, dp

Uncle Bogdan and Projections

data structures, geometry, sortings

Shifting Dominoes

data structures, geometry, graphs, trees

Colorful Tree Again

brute force, data structures, trees

Roadside Trees

data structures, dp

Organizing a Race

data structures, greedy

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Rhombus

brute force, data structures, dp

Adilbek and the Watering System

data structures, greedy, sortings

Game with Tokens

data structures, games, implementation

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Andrey's Tree

binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees

Two Segments

data structures

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Air Reform

data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees