Sereja and Brackets

data structures, schedules

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Powerful array

data structures, implementation, math, two pointers

Modulo Sum

combinatorics, data structures, dp, two pointers

Good Substrings

data structures, strings

Enemy is weak

data structures, trees

Zigzags

brute force, combinatorics, data structures, math, two pointers

Pashmak and Parmida's problem

data structures, divide and conquer, sortings

Little Elephant and Array

constructive algorithms, data structures

Integers Have Friends

binary search, data structures, divide and conquer, math, number theory, two pointers

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

XOR on Segment

bitmasks, data structures

Multiset

binary search, data structures

Mike and Feet

binary search, data structures, dp, dsu

Circular RMQ

data structures

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

XOR and Favorite Number

data structures

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Ant colony

data structures, math, number theory

Playoff Tournament

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

Rescue Nibel!

combinatorics, data structures, sortings

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Minimum spanning tree for each edge

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

Max Median

binary search, data structures, dp

Array Division

binary search, data structures, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Fools and Roads

data structures, dfs and similar, trees

Beautiful Array

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

The Treasure of The Segments

binary search, data structures, greedy

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

Watto and Mechanism

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

A and B and Interesting Substrings

data structures, dp, two pointers

SUM and REPLACE

brute force, data structures, dsu, number theory

A and B and Lecture Rooms

binary search, data structures, dfs and similar, dp, trees

ATM and Students

binary search, data structures, two pointers

Integral Array

brute force, constructive algorithms, data structures, math

Interesting Array

constructive algorithms, data structures, trees

Skyscrapers (hard version)

data structures, dp, greedy

String Reversal

data structures, greedy, strings

Captain Flint and Treasure

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

Blood Cousins

binary search, data structures, dfs and similar, trees

Propagating tree

data structures, dfs and similar, trees

Slime Escape

data structures, dp, greedy, two pointers

Two Teams

data structures, implementation, sortings

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Slimes

binary search, constructive algorithms, data structures, greedy, two pointers

Multiple Testcases

binary search, constructive algorithms, data structures, greedy, sortings, two pointers

Buying gifts

data structures, greedy, sortings

Connected Components?

data structures, dfs and similar, dsu, graphs

Molly's Chemicals

binary search, brute force, data structures, implementation, math

Petya and Array

data structures, divide and conquer, two pointers

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Difference Array

brute force, data structures, implementation, sortings

Array Stabilization (GCD version)

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

Range and Partition

binary search, constructive algorithms, data structures, greedy, two pointers

Water Tree

data structures, dfs and similar, graphs, trees

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Permutation Restoration

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

Old Floppy Drive

binary search, data structures, math

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Vessels

data structures, dsu, implementation, trees

Rating Compression

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

Berserk Monsters

brute force, data structures, dsu, implementation, math

New Year Tree

bitmasks, data structures, trees

Buy a Ticket

data structures, graphs, shortest paths

The Fair Nut and the Best Path

data structures, dp, trees

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

Bash and a Tough Math Puzzle

data structures, number theory

Clear the Multiset

data structures, divide and conquer, dp, greedy

Burenka and Traditions (hard version)

data structures, dp, greedy

Omsk Metro (simple version)

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

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Too Many Segments (hard version)

data structures, greedy, sortings

Reset K Edges

binary search, data structures, dfs and similar, graphs, greedy, trees

Desktop Rearrangement

data structures, greedy, implementation

Pair of Numbers

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

Nearest Excluded Points

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

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Remainder Problem

brute force, data structures, implementation

GCD of an Array

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

String Coloring (hard version)

data structures, dp

Restore Permutation

binary search, data structures, greedy, implementation

Clique Problem

data structures, dp, greedy, implementation, sortings

Discrete Centrifugal Jumps

data structures, dp, graphs

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Omkar and Medians

data structures, greedy, implementation

Subsequences

data structures, dp

Progressions Covering

data structures, greedy

The Bakery

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

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Too Easy Problems

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

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

CGCDSSQ

brute force, data structures, math

New Year Concert

binary search, data structures, greedy, math, number theory, two pointers