Sereja and Squares

binary search, data structures, hashing

Oh Sweet Beaverette

data structures, sortings

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Difficult Mountain

data structures, dp, greedy, sortings

Permutation

data structures, divide and conquer, hashing

Performance Review

data structures

Balance (Hard version)

brute force, data structures, number theory

Linear Kingdom Races

data structures, dp

Graph Subset Problem

constructive algorithms, data structures, graphs

Split the Tree

binary search, data structures, dp, greedy, trees

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Sanae and Giant Robot

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

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Optical Experiment

binary search, data structures, dp

Short Code

data structures, dp, greedy, strings, trees

Little Elephant and Inversions

data structures, two pointers

Bear and Bowling

data structures, greedy

RBS

binary search, bitmasks, brute force, data structures, dp

Appleman and a Sheet of Paper

data structures, implementation

Exotic Queries

data structures, implementation, sortings

Queue in the Train

data structures, greedy, implementation

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

The Classic Problem

data structures, graphs, shortest paths

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Periodic RMQ Problem

data structures

Forensic Examination

data structures, string suffix structures

Trip to Saint Petersburg

data structures

Radio stations

binary search, data structures

Nikita and stack

data structures

Animal Observation (hard version)

data structures, dp, greedy

Rebrending

brute force, data structures, divide and conquer, implementation

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Close Vertices

data structures, divide and conquer, trees

Nastya and King-Shamans

binary search, data structures

Rectangle Shrinking

binary search, brute force, data structures, greedy, implementation, two pointers

Cardboard Box

data structures, greedy

Goodbye Souvenir

data structures, divide and conquer

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

LuoTianyi and XOR-Tree

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

Leaf Sets

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

Chain Chips

data structures, dp, matrices

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Restore the Permutation by Sorted Segments

brute force, constructive algorithms, data structures, greedy, implementation

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Legen...

data structures, dp, matrices, strings

Game with Stones

binary search, data structures, games, greedy

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Bipartite Checking

data structures, dsu, graphs

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Reachable Strings

data structures, hashing, strings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Nanosoft

binary search, data structures, dp, implementation

Bug in Code

data structures, graphs, implementation, two pointers

Getting Deals Done

binary search, data structures

Last Chance

data structures, implementation, strings

Zip-line

binary search, data structures, dp, hashing

Frogs and mosquitoes

data structures, greedy

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Bamboo Partition

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

Li Hua and Array

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

LCM Sum (hard version)

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

Happy Tree Party

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

Tree Generator™

data structures, implementation, trees

Rooks and Rectangles

data structures, sortings

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

80-th Level Archeology

brute force, data structures, greedy, sortings

Iahub and Xors

data structures

T-Shirts

data structures

Package Delivery

data structures, divide and conquer, greedy

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Fancy Fence

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

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Tree Queries

data structures, probabilities, trees

Palindrome Partition

binary search, brute force, data structures, dp, hashing, strings

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Beautiful Mirrors with queries

data structures, probabilities

Corporation Mail

data structures, expression parsing, implementation

Working routine

data structures, implementation

Games on a CD

data structures, hashing, string suffix structures, strings

Extending Set of Points

data structures, divide and conquer, dsu

Distance Tree (easy version)

binary search, data structures, dfs and similar, graphs, shortest paths, trees

Mischievous Shooter

brute force, data structures, divide and conquer, dp, implementation

Roads in Yusland

data structures, dp, greedy

Ralph And His Tour in Binary Country

brute force, data structures, trees

Guess Your Way Out! II

data structures, implementation, sortings

Painting Edges

binary search, data structures

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Strange Function

binary search, data structures, dp, greedy

Mice and Holes

data structures, dp, greedy, sortings

Developing Game

data structures

King Kog's Reception

data structures

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Three Days Grace

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

Middle Duplication

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

Good Subsegments

data structures

Animals and Puzzle

binary search, data structures

Controversial Rounds

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