Four Divisors

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

Buses and People

binary search, data structures, sortings

Teams Forming

*special problem, sortings

Spring Cleaning

*special problem, greedy, sortings

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, sortings, two pointers

Lucky Sorting

constructive algorithms, sortings

Large Triangle

binary search, geometry, sortings

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

Volcanoes

binary search, implementation, sortings, two pointers

Castle

dp, greedy, probabilities, sortings, trees

Katya and Segments Sets

data structures, interactive, sortings

Wilbur and Trees

dp, math, probabilities, sortings

Drone Photo

combinatorics, math, sortings

Geometers Anonymous Club

data structures, geometry, math, sortings

Help, what does it mean to be "Based"

brute force, constructive algorithms, expression parsing, implementation, sortings

Parade

data structures, sortings

Map

data structures, implementation, sortings

Vasya and Endless Credits

dp, flows, graph matchings, graphs, sortings

Intriguing Selection

brute force, constructive algorithms, implementation, interactive, sortings

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

Library game

games, greedy, interactive, sortings

Halve or Subtract

binary search, brute force, dp, greedy, sortings

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Caterpillar on a Tree

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

Dating

greedy, sortings, trees

Bear and Contribution

data structures, greedy, sortings, two pointers

General Mobilization

data structures, dfs and similar, sortings

Off by One

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

Boboniu and Jianghu

dp, greedy, sortings, trees

Curfew

binary search, brute force, greedy, sortings

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Strange Array

data structures, greedy, sortings

Mushroom Gnomes - 2

binary search, data structures, probabilities, sortings

Berland Elections

greedy, sortings

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

Group Photo 2 (online mirror version)

brute force, greedy, sortings

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

New Year and Three Musketeers

data structures, greedy, sortings

The Boss's Identity

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

Gerald and Path

dp, sortings

Students' Revenge

data structures, greedy, sortings

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Guard Duty (medium)

binary search, dp, greedy, sortings

Reading Books (hard version)

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

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Minimum Sum

divide and conquer, geometry, sortings

Guard Towers

binary search, dsu, geometry, graphs, sortings

Doremy's Experimental Tree

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

Points Movement

data structures, dp, greedy, implementation, sortings

Velepin and Marketing

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

Field Photography

bitmasks, data structures, sortings

Maximize The Value

data structures, sortings

Bicolored Segments

data structures, dp, graph matchings, sortings

Flip the Cards

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

Choose a Square

binary search, data structures, sortings

Playlist

math, probabilities, sortings

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

Runner's Problem

dp, matrices, sortings

Summoning Minions

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

Parametric MST

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

Zebra Tower

*special problem, data structures, greedy, sortings

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

Analyzing Polyline

geometry, math, sortings

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Gojou and Matrix Game

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

Minimal String Xoration

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

New Passenger Trams

binary search, brute force, data structures, sortings, two pointers

Before Exam

constructive algorithms, implementation, sortings

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Mice and Holes

data structures, dp, greedy, sortings

New Year and Castle Construction

combinatorics, geometry, math, sortings

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Guess Your Way Out! II

data structures, implementation, sortings

Bus

*special problem, implementation, sortings

Knights

geometry, graphs, shortest paths, sortings

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

80-th Level Archeology

brute force, data structures, greedy, sortings

Rooks and Rectangles

data structures, sortings

Hydra

graphs, sortings

Doremy's Number Line

dp, greedy, sortings

Bamboo Partition

brute force, data structures, implementation, math, number theory, sortings, two pointers

Banquet Preparations 2

greedy, sortings, two pointers

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Median on Segments (General Case Edition)

sortings

Mice problem

geometry, implementation, math, sortings

Leaf Sets

data structures, dfs and similar, dsu, graphs, greedy, sortings, trees

Собери стол

constructive algorithms, sortings

Tenzing and Tree

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

Expected diameter of a tree

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

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Geometry Horse

greedy, implementation, sortings, two pointers

Network Safety

dfs and similar, dsu, graphs, math, sortings

Exotic Queries

data structures, implementation, sortings

Spider's Web

binary search, sortings, two pointers

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Sanae and Giant Robot

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

Oranges and Apples

constructive algorithms, sortings