Peaceful Rooks

dfs and similar, dsu, graphs

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

RPG Protagonist

brute force, greedy, math

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

Omkar and Bed Wars

dp, greedy

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

AND, OR and square sum

bitmasks, greedy, math

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Mixing Water

binary search, math

Magic Tricks

*special problem, dp, graphs

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Xenia and Colorful Gems

binary search, greedy, math, sortings, two pointers

Three Blocks Palindrome (easy version)

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

Eugene and an array

binary search, data structures, implementation, two pointers

Walk on Matrix

bitmasks, constructive algorithms, math

Dreamoon Likes Sequences

bitmasks, combinatorics, math

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Sleeping Schedule

dp, implementation

Navigation System

dfs and similar, graphs, shortest paths

Different Rules

constructive algorithms, greedy, implementation, math

Count the Arrays

combinatorics, math

Recommendations

data structures, greedy, sortings

Ayoub's function

binary search, combinatorics, greedy, math, strings

Infinite Prefixes

math, strings

Aroma's Search

brute force, constructive algorithms, geometry, greedy, implementation

Cut and Paste

implementation, math

Santa's Bot

combinatorics, math, probabilities

Berry Jam

data structures, dp, greedy, implementation

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Elections

greedy

Infinite Fence

greedy, math, number theory

Yet Another Monster Killing Problem

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

Platforms Jumping

greedy

Feeding Chicken

constructive algorithms, greedy, implementation

Harmonious Graph

constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

By Elevator or Stairs?

dp, shortest paths

Ivan the Fool and the Probability Theory

combinatorics, dp, math

Balanced Removals (Easier)

constructive algorithms, geometry, greedy

Primes and Multiplication

math, number theory

Messy

constructive algorithms

Periodic integer number

implementation, strings

The Number Of Good Substrings

binary search, bitmasks, brute force

White Sheet

geometry, math

Ticket Game

games, greedy, math

Ice Cream

*special problem, greedy, sortings

Marcin and Training Camp

brute force, greedy

Anadi and Domino

brute force, graphs

Cow and Snacks

dfs and similar, dsu, graphs

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

You Are Given a Decimal String...

brute force, dp, shortest paths

1-2-K Game

games, math

Extra Element

implementation, math

Exam in BerSU (hard version)

brute force, data structures, greedy, math

Beautiful Lyrics

data structures, greedy, strings

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Increasing by Modulo

binary search, greedy

Minimum Array

binary search, data structures, greedy

Increasing Subsequence (hard version)

greedy

Serval and Parenthesis Sequence

greedy, strings

Crazy Diamond

constructive algorithms, sortings

Tree Diameter

bitmasks, graphs, interactive

Graph Without Long Directed Paths

dfs and similar, graphs

The Beatles

brute force, math

Superhero Battle

math

Painting the Fence

brute force

Asya And Kittens

constructive algorithms, dsu

Toy Train (Simplified)

brute force, greedy

Yet Another Ball Problem

constructive algorithms, implementation

Coffee and Coursework (Hard Version)

binary search, greedy

Coffee and Coursework (Easy version)

brute force, greedy

Palindromic Matrix

constructive algorithms, implementation

Block unitary

*special problem

Trailing Loves (or L'oeufs?)

brute force, implementation, math, number theory

Creative Snap

binary search, brute force, divide and conquer, math

Average Superhero Gang Power

brute force, implementation, math

Monotonic Renumeration

combinatorics, sortings

Beautiful Graph

dfs and similar, graphs

Prefixes and Suffixes

strings

New Year and the Permutation Concatenation

combinatorics, dp, math

Easy Chess

constructive algorithms

Minimum Diameter Tree

constructive algorithms, implementation, trees

Berland Fair

binary search, brute force, data structures, greedy

Colored Rooks

constructive algorithms, graphs

Binary Numbers AND Sum

data structures, implementation, math

Multiplicity

data structures, dp, implementation, math, number theory

Pick Heroes

greedy, implementation, interactive, sortings

Bicolorings

bitmasks, dp

The Tower is Going Home

binary search, two pointers

Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

Array Product

constructive algorithms, greedy, math

Glider

binary search, data structures, two pointers

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Playing Piano

constructive algorithms, dp

Mouse Hunt

dfs and similar, graphs

Array Restoration

constructive algorithms, data structures