Zigzags

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

Multiset

binary search, data structures

Mike and Feet

binary search, data structures, dp, dsu

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Array Division

binary search, data structures, implementation

Fools and Roads

data structures, dfs and similar, trees

Beautiful Array

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

String Reversal

data structures, greedy, strings

Skyscrapers (hard version)

data structures, dp, greedy

Cow and Fields

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

Multiple Testcases

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

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

Permutation Restoration

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

Old Floppy Drive

binary search, data structures, math

Permutation Graph

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

Berserk Monsters

brute force, data structures, dsu, implementation, math

Bash and a Tough Math Puzzle

data structures, number theory

Burenka and Traditions (hard version)

data structures, dp, greedy

Reset K Edges

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

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

Restore Permutation

binary search, data structures, greedy, implementation

Progressions Covering

data structures, greedy

Subsequences

data structures, dp

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

Alyona and a tree

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Survey in Class

brute force, data structures, greedy, implementation, sortings

Inconvenient Pairs

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

Restore the Permutation

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

Blocking Elements

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

Equalize the Remainders

data structures, greedy, implementation

Same Sum Blocks (Hard)

data structures, greedy

Lena and Matrix

data structures, dp, geometry, shortest paths

Psychos in a Line

data structures, implementation

Rescheduling the Exam

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

Arthur and Table

brute force, data structures, dp, greedy, math, sortings

Moving Points

data structures, divide and conquer, implementation, sortings

White Lines

brute force, data structures, dp, implementation, two pointers

Copying Data

data structures

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Kay and Snowflake

data structures, dfs and similar, dp, trees

Playlist

data structures, dsu, implementation, shortest paths

Collapsing Strings

data structures, strings, trees

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Microcycle

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

Li Hua and Tree

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

Yet Another Sorting Problem

data structures, math

Robot Queries

binary search, data structures, dp, implementation

Vasya and a Tree

data structures, trees

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Petya and Divisors

binary search, data structures, number theory

Tree Reconstruction

constructive algorithms, data structures, graphs, greedy

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Kirill and Mushrooms

data structures, sortings

Tufurama

data structures

Sum of Progression

brute force, data structures, dp, implementation, math

The Wu

bitmasks, brute force, data structures

Permutation Addicts

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

Feed Cats

data structures, dp, sortings

Music Festival

binary search, data structures, dp, greedy, sortings

Restructuring Company

data structures, dsu

Generating Sets

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

Nezzar and Binary String

data structures, greedy

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

Exposition

binary search, data structures, dsu, trees, two pointers

Bank Hacking

constructive algorithms, data structures, dp, trees

Let's Play the Words?

data structures, hashing, implementation, math

Expand the Path

brute force, combinatorics, data structures, implementation, math

Credit Card

data structures, dp, greedy, implementation

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Tyler and Strings

combinatorics, data structures, implementation

Video Cards

brute force, data structures, implementation, math, number theory

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Sereja ans Anagrams

binary search, data structures

Handshakes

binary search, constructive algorithms, data structures, greedy

Monitor

binary search, data structures

Felicity is Coming!

data structures, hashing, sortings, strings

Connected Components

data structures, dfs and similar, dp, dsu

Dense Subsequence

data structures, greedy, strings

Shark

brute force, data structures, dsu, trees

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Teodor is not a liar!

data structures, dp

Preparing for the Contest

binary search, data structures, greedy, sortings

Card Game Again

binary search, data structures, number theory, two pointers

Accumulator Apex

data structures, implementation, sortings

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

Two Strings

data structures, dp, strings

Insertion Sort

data structures, dp, implementation, math

Mister B and PR Shifts

data structures, implementation, math

Old Berland Language

data structures, greedy, trees

Optical Experiment

binary search, data structures, dp

Bug in Code

data structures, graphs, implementation, two pointers

Comb

data structures, dp

Merge Equal Elements

constructive algorithms, data structures