Save the Nature

binary search, greedy

Make The Fence Great Again

dp

Periodic integer number

implementation, strings

Workout plan

data structures, greedy

The Number Of Good Substrings

binary search, bitmasks, brute force

Zmei Gorynich

greedy, math

White Sheet

geometry, math

Ticket Game

games, greedy, math

Swap Letters

constructive algorithms, greedy

The Number of Products

combinatorics, dp, implementation

Optimal Currency Exchange

brute force, math

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Equalizing by Division (hard version)

brute force, math, sortings

Equalizing by Division (easy version)

brute force, implementation

Ice Cream

*special problem, greedy, sortings

Traveling Around the Golden Ring of Berland

*special problem, implementation

Marcin and Training Camp

brute force, greedy

Anadi and Domino

brute force, graphs

Cow and Snacks

dfs and similar, dsu, graphs

Paint the Digits

constructive algorithms, greedy, implementation

Magic Grid

constructive algorithms

Uniqueness

binary search, brute force, implementation, two pointers

Number Of Permutations

combinatorics

Gas Pipeline

dp, greedy

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Boxers

greedy, sortings

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

Remove the Substring (easy version)

greedy, implementation

You Are Given a Decimal String...

brute force, dp, shortest paths

Maximum Median

binary search, greedy, math, sortings

Zero Array

greedy, math

Round Corridor

math, number theory

Welfare State

binary search, brute force, data structures, sortings

MP3

sortings, two pointers

Array Splitting

greedy, sortings

Connected Component on a Chessboard

constructive algorithms, implementation

RGB Substring (hard version)

data structures, dp, implementation, two pointers

RGB Substring (easy version)

implementation

Robot Breakout

implementation

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

Basketball Exercise

dp

1-2-K Game

games, math

Tokitsukaze, CSL and Stone Game

games

Tokitsukaze and Discard Items

implementation, two pointers

Candies!

data structures, dp, implementation, math

Add on a Tree

trees

Vasya And Array

constructive algorithms, greedy, implementation

Vus the Cossack and Numbers

constructive algorithms, greedy, math

Vus the Cossack and Strings

implementation, math

Extra Element

implementation, math

Exam in BerSU (hard version)

brute force, data structures, greedy, math

Parallel Universes (Easy)

implementation

Heidi and the Turing Test (Easy)

implementation

The Doctor Meets Vader (Easy)

binary search, sortings

Candy Box (easy version)

greedy, sortings

Computer Game

binary search, math

Beautiful Lyrics

data structures, greedy, strings

Split a Number

greedy, implementation, strings

Nick and Array

greedy, implementation

Tolik and His Uncle

constructive algorithms

Valeriy and Deque

data structures, implementation

Prime Graph

constructive algorithms, greedy, math, number theory

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Cover it!

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

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Electrification

binary search, brute force, greedy

Catch Overflow!

data structures, expression parsing, implementation

Nauuo and Cards

greedy, implementation

Pairs

graphs, implementation

Increasing by Modulo

binary search, greedy

Bicolored RBS

constructive algorithms, greedy

News Distribution

dfs and similar, dsu, graphs

Lost Numbers

brute force, divide and conquer, interactive, math

A Tale of Two Lands

binary search, sortings, two pointers

Two Arrays and Sum of Functions

greedy, math, sortings

Almost All Divisors

math, number theory

Cat Party (Hard Edition)

data structures, implementation

Cat Party (Easy Edition)

data structures, implementation

Double Matrix

brute force, greedy

The Party and Sweets

binary search, constructive algorithms, greedy, implementation, math, sortings, two pointers

Minimum Array

binary search, data structures, greedy

Increasing Subsequence (hard version)

greedy

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Inscribed Figures

geometry

Two Teams

data structures, implementation, sortings

Walking Robot

greedy

Gourmet Cat

implementation, math

Serval and Parenthesis Sequence

greedy, strings

Neko does Maths

brute force, math, number theory

Stas and the Queue at the Buffet

greedy, math, sortings

Problem for Nazar

constructive algorithms, math

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Dirty Deeds Done Dirt Cheap

greedy, sortings

Crazy Diamond

constructive algorithms, sortings

Born This Way

binary search, brute force, two pointers

Hide and Seek

graphs

Tree Diameter

bitmasks, graphs, interactive

Graph Without Long Directed Paths

dfs and similar, graphs

Equalize Them All

constructive algorithms, greedy