The Potion of Great Power

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

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Sort the Table

*special problem, sortings

Inversion SwapSort

constructive algorithms, greedy, sortings

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Two Editorials

brute force, dp, greedy, sortings, two pointers

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Oranges and Apples

constructive algorithms, sortings

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Swapping Problem

brute force, constructive algorithms, data structures, sortings

New Year and Castle Construction

combinatorics, geometry, math, sortings

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Gojou and Matrix Game

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

Summoning Minions

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

Doremy's Experimental Tree

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

Reading Books (hard version)

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

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

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Caterpillar on a Tree

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

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Library game

games, greedy, interactive, sortings

Map

data structures, implementation, sortings

Geometers Anonymous Club

data structures, geometry, math, sortings

Volcanoes

binary search, implementation, sortings, two pointers

Sereja and Straight Lines

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

Perun, Ult!

brute force, greedy, sortings

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Runaway to a Shadow

geometry, sortings

A Story of One Country (Easy)

brute force, divide and conquer, sortings

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

New Year Tree Decorations

geometry, schedules, sortings

Row of Models

greedy, sortings

Mice and Holes

data structures, dp, greedy, sortings

Parametric MST

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

Flip the Cards

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

Bicolored Segments

data structures, dp, graph matchings, sortings

Velepin and Marketing

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

Points Movement

data structures, dp, greedy, implementation, sortings

Guard Towers

binary search, dsu, geometry, graphs, sortings

Strange Array

data structures, greedy, sortings

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Camping Groups

data structures, sortings

Kay and Eternity

brute force, implementation, sortings

Maximum Waterfall

data structures, dp, graphs, sortings

Tourists

data structures, sortings

New Year Snowflake

geometry, sortings

Difficult Mountain

data structures, dp, greedy, sortings

Off by One

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

Halve or Subtract

binary search, brute force, dp, greedy, sortings

Large Triangle

binary search, geometry, sortings

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, sortings, two pointers

Unordered Swaps

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

Monocarp and a Strategic Game

geometry, sortings, two pointers

Employment

greedy, sortings

Uncle Bogdan and Projections

data structures, geometry, sortings

Adilbek and the Watering System

data structures, greedy, sortings

Donkey and Stars

data structures, dp, geometry, math, sortings

Roland and Rose

brute force, geometry, math, sortings

MCMF?

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

Kingdom and its Cities

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

Minimal String Xoration

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

Boboniu and Jianghu

dp, greedy, sortings, trees

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Bear and Paradox

binary search, greedy, math, sortings

M-tree

data structures, math, sortings, trees

The Cells on the Paper

binary search, implementation, sortings

Min Cost Permutation (Hard Version)

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

Little Brother

binary search, geometry, sortings

Snow sellers

greedy, sortings

Tiles for Bathroom

data structures, sortings, two pointers

GCD Master (easy version)

greedy, math, number theory, sortings

GCD Master (hard version)

greedy, math, sortings

Evaluate RBS

data structures, geometry, implementation, math, sortings

Wavy numbers

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

Mixture

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

Roads

*special problem, geometry, sortings

Gosha is hunting

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

Gerald and Path

dp, sortings

Swap Pass

constructive algorithms, geometry, sortings

Mike and code of a permutation

constructive algorithms, data structures, graphs, sortings

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Blog Post Rating

data structures, sortings

Selling Numbers

dp, sortings

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

A Story of One Country (Hard)

brute force, greedy, sortings

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Minimum Difference

data structures, hashing, sortings, two pointers

Berserk Robot

constructive algorithms, math, sortings

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Tree Calendar

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

Slalom

data structures, dp, sortings

Triangles 3000

geometry, sortings

Dangerous Laser Power

constructive algorithms, dsu, sortings

Freak Joker Process

binary search, data structures, sortings

Unequal Adjacent Elements

constructive algorithms, sortings