Spaceship Crisis Management

binary search, data structures, geometry, sortings

Olympiad Training

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

Lost Nodes

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

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Minimize Inversions Number

data structures, greedy, math, sortings

Caramel Clouds

data structures, dp, sortings

Phoenix and Diamonds

binary search, data structures, sortings

Origami

geometry, math, sortings

A Certain Magical Party

combinatorics, data structures, greedy, sortings

Rainbow Rectangles

data structures, sortings, two pointers

Omkar and Tours

data structures, divide and conquer, sortings, trees

Strange Sort

data structures, sortings

A New Beginning

data structures, dp, geometry, sortings

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Unequal Adjacent Elements

constructive algorithms, sortings

Freak Joker Process

binary search, data structures, sortings

Dangerous Laser Power

constructive algorithms, dsu, sortings

Triangles 3000

geometry, sortings

Slalom

data structures, dp, sortings

Tree Calendar

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

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Berserk Robot

constructive algorithms, math, sortings

Minimum Difference

data structures, hashing, sortings, two pointers

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

A Story of One Country (Hard)

brute force, greedy, sortings

Selling Numbers

dp, sortings

Blog Post Rating

data structures, sortings

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

Swap Pass

constructive algorithms, geometry, sortings

Gerald and Path

dp, sortings

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Roads

*special problem, geometry, sortings

Mixture

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

Wavy numbers

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

Evaluate RBS

data structures, geometry, implementation, math, sortings

GCD Master (hard version)

greedy, math, sortings

GCD Master (easy version)

greedy, math, number theory, sortings

Tiles for Bathroom

data structures, sortings, two pointers

Snow sellers

greedy, sortings

Little Brother

binary search, geometry, sortings

Min Cost Permutation (Hard Version)

binary search, constructive algorithms, data structures, greedy, math, sortings

The Cells on the Paper

binary search, implementation, sortings

M-tree

data structures, math, sortings, trees

Bear and Paradox

binary search, greedy, math, sortings

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Boboniu and Jianghu

dp, greedy, sortings, trees

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

MCMF?

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

Roland and Rose

brute force, geometry, math, sortings

Donkey and Stars

data structures, dp, geometry, math, sortings

Adilbek and the Watering System

data structures, greedy, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

Employment

greedy, sortings

Monocarp and a Strategic Game

geometry, sortings, two pointers

Unordered Swaps

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

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, sortings, two pointers

Large Triangle

binary search, geometry, sortings

Halve or Subtract

binary search, brute force, dp, greedy, sortings

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Difficult Mountain

data structures, dp, greedy, sortings

New Year Snowflake

geometry, sortings

Tourists

data structures, sortings

Maximum Waterfall

data structures, dp, graphs, sortings

Kay and Eternity

brute force, implementation, sortings

Camping Groups

data structures, sortings

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Strange Array

data structures, greedy, sortings

Guard Towers

binary search, dsu, geometry, graphs, sortings

Points Movement

data structures, dp, greedy, implementation, sortings

Velepin and Marketing

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

Bicolored Segments

data structures, dp, graph matchings, sortings

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Mice and Holes

data structures, dp, greedy, sortings

Row of Models

greedy, sortings

New Year Tree Decorations

geometry, schedules, sortings

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Runaway to a Shadow

geometry, sortings

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Perun, Ult!

brute force, greedy, sortings

Sereja and Straight Lines

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

Volcanoes

binary search, implementation, sortings, two pointers

Geometers Anonymous Club

data structures, geometry, math, sortings

Map

data structures, implementation, sortings

Library game

games, greedy, interactive, sortings

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings