Keen Tree Calculation

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

Dividing Kingdom

binary search, brute force, data structures

Electrical Efficiency

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

Half-decay tree

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

Cutting a Fence

binary search, data structures, dsu

Fetch the Treasure

brute force, data structures, graphs, shortest paths

Encryption (hard)

data structures, dp

Virus

data structures, divide and conquer, dsu, graphs

Sereja and Straight Lines

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

Babysitting

2-sat, binary search, data structures, graphs, trees

Kingdom of Criticism

data structures, dsu

Robot Arm

data structures, geometry

Igloo Skyscraper

data structures, geometry

Memory and Casinos

data structures, math, probabilities

Robot and Candies

data structures, graph matchings, greedy

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Magic multisets

data structures

Inversion Composition

constructive algorithms, data structures, greedy

Alice and the Unfair Game

binary search, data structures, dp, dsu

Recursive Queries

data structures

Yaroslav and Points

data structures

Almost Increasing Array

data structures, dp

Functions On The Segments

data structures

Geometers Anonymous Club

data structures, geometry, math, sortings

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Map

data structures, implementation, sortings

More Queries to Array...

data structures, math

Nobody is needed

2-sat, data structures, dfs and similar, dp

Board Game

data structures, dfs and similar

Putting Boxes Together

data structures

Alphabet Permutations

data structures, strings

Tree Queries

data structures, dfs and similar, graphs, implementation, trees

Balancing Weapons

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

Lena and Queries

data structures, divide and conquer, geometry

Tree

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

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

The Boss's Identity

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

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Points

combinatorics, data structures, implementation, math, matrices

Reading Books (hard version)

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

Narrow Components

brute force, data structures, dp, dsu, math, trees

Aquarium decoration

data structures, greedy, two pointers

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Maximum Reduction

combinatorics, data structures, math

Group Photo

binary search, data structures, implementation, two pointers

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Gojou and Matrix Game

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

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Controversial Rounds

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

Middle Duplication

data structures, dfs and similar, greedy, strings, trees

Strange Function

binary search, data structures, dp, greedy

Working routine

data structures, implementation

Iahub and Xors

data structures

LCM Sum (hard version)

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

Frogs and mosquitoes

data structures, greedy

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Bipartite Checking

data structures, dsu, graphs

Legen...

data structures, dp, matrices, strings

Reachable Strings

data structures, hashing, strings

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

LuoTianyi and XOR-Tree

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

Nanosoft

binary search, data structures, dp, implementation

Nastya and King-Shamans

binary search, data structures

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Sanae and Giant Robot

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

Alyona and towers

data structures

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Ray in the tube

data structures, divide and conquer, dp, math

Team-Building

data structures, dfs and similar, dsu, graphs

Three Occurrences

data structures, divide and conquer, hashing, two pointers

REQ

data structures, number theory

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Square-free division (hard version)

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

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Artem and Array

data structures, greedy

GukiZ and GukiZiana

binary search, data structures, implementation

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Kefa and Watch

data structures, hashing, strings

Sorting Books

data structures, dp, greedy

Partition Game

binary search, data structures, divide and conquer, dp

Subset Sums

brute force, data structures

Ivan and Burgers

data structures, divide and conquer, greedy, math

Sign on Fence

binary search, constructive algorithms, data structures

Mass Change Queries

data structures

Destiny

data structures, probabilities

Sum of Digits of Sums

*special problem, binary search, data structures

Managing Telephone Poles

data structures, geometry

Looking for Owls

binary search, data structures, geometry, hashing, sortings

The Potion of Great Power

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

Hanger

data structures

Gripping Story

binary search, data structures, sortings

Great City Saint Petersburg

data structures

Berkomnadzor

data structures, greedy

Ratings and Reality Shows

data structures, two pointers

New Year Presents

constructive algorithms, data structures