Unequal Adjacent Elements

constructive algorithms, sortings

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Sort the Table

*special problem, sortings

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Snow sellers

greedy, sortings

Origami

geometry, math, sortings

Roads

*special problem, geometry, sortings

Table Bowling

*special problem, sortings

Movie Fan

*special problem, data structures, greedy, implementation, sortings

Mixture

*special problem, data structures, geometry, math, sortings

Little Brother

binary search, geometry, sortings

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Row of Models

greedy, sortings

Array sorting

*special problem, sortings

Dangerous Laser Power

constructive algorithms, dsu, sortings

Caramel Clouds

data structures, dp, sortings

Slalom

data structures, dp, sortings

GCD Master (hard version)

greedy, math, sortings

Phoenix and Diamonds

binary search, data structures, sortings

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

Phoenix and Bits

bitmasks, brute force, data structures, sortings

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Strange Sort

data structures, sortings

Triangles 3000

geometry, sortings

Looking for Owls

binary search, data structures, geometry, hashing, sortings

A Story of One Country (Hard)

brute force, greedy, sortings

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

GCD Master (easy version)

greedy, math, number theory, sortings

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Minimize Inversions Number

data structures, greedy, math, sortings

Inquisition

geometry, implementation, sortings

Representative Sampling

dp, sortings, strings

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Bonus Distribution

*special problem, binary search, greedy, sortings

Item World

brute force, implementation, sortings

Rainbow Rectangles

data structures, sortings, two pointers

Omkar and Tours

data structures, divide and conquer, sortings, trees

Transportation

greedy, sortings, two pointers

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Selling Numbers

dp, sortings

Blog Post Rating

data structures, sortings

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Property

greedy, sortings

Roland and Rose

brute force, geometry, math, sortings

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

Donkey and Stars

data structures, dp, geometry, math, sortings

New Year Tree Decorations

geometry, schedules, sortings

Tiles for Bathroom

data structures, sortings, two pointers

Cannon

data structures, geometry, sortings

New Year Snowflake

geometry, sortings

Tourists

data structures, sortings

Adilbek and the Watering System

data structures, greedy, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

A New Beginning

data structures, dp, geometry, sortings

Gripping Story

binary search, data structures, sortings

Maximum Waterfall

data structures, dp, graphs, sortings

A Story of One Country (Easy)

brute force, divide and conquer, sortings

The Cells on the Paper

binary search, implementation, sortings

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Cartoons

*special problem, implementation, sortings

Berserk Robot

constructive algorithms, math, sortings

M-tree

data structures, math, sortings, trees

Employment

greedy, sortings

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Optimizer

data structures, greedy, sortings

Swap Pass

constructive algorithms, geometry, sortings

Minimum Difference

data structures, hashing, sortings, two pointers

Runaway to a Shadow

geometry, sortings

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, sortings, two pointers

Ice Cream

*special problem, greedy, sortings

Bug in Code

binary search, data structures, sortings

Kay and Eternity

brute force, implementation, sortings

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

Need For Brake

binary search, greedy, sortings

Ancient Language

graphs, sortings

Hyperregular Bracket Strings

combinatorics, data structures, hashing, number theory, sortings

Library game

games, greedy, interactive, sortings

Printer

binary search, data structures, implementation, sortings

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Sereja and Straight Lines

binary search, data structures, geometry, sortings, two pointers

Perun, Ult!

brute force, greedy, sortings

Camping Groups

data structures, sortings

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Place Your Ad Here

data structures, sortings

Drone Photo

combinatorics, math, sortings

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Bear and Paradox

binary search, greedy, math, sortings

Buses and People

binary search, data structures, sortings

Four Divisors

data structures, dp, math, number theory, sortings, two pointers

Renovation

constructive algorithms, greedy, sortings

Conveyor

sortings, two pointers

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Lucky Tickets

binary search, data structures, sortings, two pointers

Moon Craters

dp, sortings

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Large Triangle

binary search, geometry, sortings

Spring Cleaning

*special problem, greedy, sortings

Teams Forming

*special problem, sortings

Katya and Segments Sets

data structures, interactive, sortings

Halve or Subtract

binary search, brute force, dp, greedy, sortings