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

Bug in Code

binary search, data structures, sortings

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Train Car Selection

data structures, greedy

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

Awards For Contestants

brute force, data structures, dp

Encryption (hard)

data structures, dp

Colored Tree

data structures, trees

...Wait for it...

data structures, dsu, trees

New Year Presents

constructive algorithms, data structures

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

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

Ratings and Reality Shows

data structures, two pointers

GCD is Greater

brute force, data structures, math, number theory

Nastya and CBS

brute force, data structures, hashing

Distance to the Path

data structures, dfs and similar, trees

Berkomnadzor

data structures, greedy

Cyclic Cipher

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

Big Problems for Organizers

data structures, graphs, trees

Chess Strikes Back (hard version)

data structures, divide and conquer

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

Sweets

*special problem, data structures, implementation

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Game On Tree

data structures, dfs and similar, greedy, trees

Array Game

data structures, games

Cutting a Fence

binary search, data structures, dsu

LuoTianyi and the Function

data structures

Field Should Not Be Empty

brute force, data structures, divide and conquer

Huffman Coding on Segment

data structures, greedy

Half-decay tree

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

Bear and Cavalry

data structures, divide and conquer, dp

Fence

binary search, data structures, string suffix structures

String Distance

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

Optimizer

data structures, greedy, sortings

Gasoline prices

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

Electrical Efficiency

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

Intervals of Intervals

binary search, data structures, two pointers

Noble Knight's Path

data structures, trees

Joker

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

Yet Another Partiton Problem

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

Exam

data structures, string suffix structures, trees

Robots protection

data structures

Arkady and a Nobody-men

data structures, dfs and similar, trees

Beautiful fountains rows

data structures

Edge Queries

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

Chainword

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

Magic Tree

*special problem, data structures, dp, trees

Nagini

binary search, data structures

Great City Saint Petersburg

data structures

Sherlock's bet to Moriarty

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

Tiles for Bathroom

data structures, sortings, two pointers

Decoding of Integer Sequences

*special problem, data structures, implementation

Maximum Waterfall

data structures, dp, graphs, sortings

Almost Sorted

bitmasks, data structures, dp

The Awesomest Vertex

data structures, dfs and similar

Bitwise Paradox

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

Location

data structures, dp, math, number theory

Dividing Kingdom

binary search, brute force, data structures

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Squid Game

data structures, dfs and similar, greedy, trees

Coins Exhibition

data structures, dp, math

Keen Tree Calculation

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

Qingshan and Daniel

brute force, data structures, greedy, implementation

Nim Shortcuts

data structures, games

Nauuo and Bug

data structures

Try Booking

data structures, divide and conquer

Dasha and Photos

brute force, data structures, dp, implementation

Equal LCM Subsets

data structures, math, number theory

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

Shifting Dominoes

data structures, geometry, graphs, trees

Roadside Trees

data structures, dp

Smooth Sailing (Hard Version)

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

Colorful Tree Again

brute force, data structures, trees

Organizing a Race

data structures, greedy

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Rhombus

brute force, data structures, dp

Game with Tokens

data structures, games, implementation

Design Tutorial: Increase the Constraints

bitmasks, data structures, fft

Adilbek and the Watering System

data structures, greedy, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

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

Summer Homework

data structures, math

Segment tree or Fenwick?

data structures