Encrypting Messages

data structures

Summer Homework

brute force, data structures

Oh Sweet Beaverette

data structures, sortings

Good Subarrays

data structures, dp, math

Potions (Hard Version)

data structures, greedy

Constructing the Array

constructive algorithms, data structures, sortings

Orac and LCM

data structures, math, number theory

Distinct Characters Queries

data structures

Reading Books (easy version)

data structures, greedy, sortings

Alternating Current

data structures, greedy, implementation

Least Prefix Sum

data structures, greedy

Gardener and Tree

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

MEX maximizing

data structures, greedy, implementation, math

To Become Max

binary search, brute force, data structures, dp

Tracking Segments

binary search, brute force, data structures, two pointers

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Sum and Product

binary search, data structures, math

Catch Overflow!

data structures, expression parsing, implementation

Counting Rectangles

brute force, data structures, dp, implementation

Binary String Copying

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

Kolya and Movie Theatre

constructive algorithms, data structures, greedy

Queries for the Array

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

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Hits Different

data structures, dp, implementation, math

Welfare State

binary search, brute force, data structures, sortings

Coffee Break

binary search, data structures, greedy, two pointers

Playlist

brute force, data structures, sortings

Planar Reflections

brute force, data structures, dp

Replacement

constructive algorithms, data structures, implementation

Thor

brute force, data structures, implementation

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Destroying Array

data structures, dsu

Longest k-Good Segment

binary search, data structures, two pointers

Color with Occurrences

brute force, data structures, dp, greedy, strings

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Mind Control

brute force, data structures, implementation

Rudolf and k Bridges

binary search, data structures, dp, two pointers

Tokitsukaze and Strange Inequality

brute force, data structures, dp

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Reverse Madness

data structures, greedy

Character Blocking

data structures, hashing, implementation

New Reform

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

Heap Operations

constructive algorithms, data structures, greedy

Producing Snow

binary search, data structures

Cat Party (Hard Edition)

data structures, implementation

Vasya and Basketball

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

Merge Equals

data structures, implementation

Cows and Sequence

constructive algorithms, data structures, implementation

Alyona and Spreadsheet

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

Optimal Subsequences (Easy Version)

data structures, greedy

Anya and Smartphone

constructive algorithms, data structures, implementation

Bear and Blocks

binary search, data structures, dp, math

Milking cows

data structures, greedy

Maximum Submatrix 2

data structures, dp, implementation, sortings

Preparing for Merge Sort

binary search, data structures

Matrix

combinatorics, data structures, implementation

Kostya the Sculptor

data structures, hashing

Polycarp's phone book

data structures, implementation, sortings

Even Path

data structures, implementation

Cards Sorting

data structures, implementation, sortings

Text Editor

data structures, dfs and similar, graphs, greedy, shortest paths

Statistics of Recompressing Videos

*special problem, data structures, implementation

Suspects

constructive algorithms, data structures, implementation

Running with Obstacles

*special problem, data structures, dp, greedy

Number of Ways

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

Xenia and Bit Operations

data structures, trees

Color the Fence

data structures, dp, greedy, implementation

Prefix Flip (Hard Version)

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

Array Destruction

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

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Eugene and an array

binary search, data structures, implementation, two pointers

Monsters And Spells

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

Helping the Nature

constructive algorithms, data structures, greedy

Three Blocks Palindrome (easy version)

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

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Bear and Prime Numbers

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

Program

data structures, dp, implementation, strings

Geometric Progression

binary search, data structures, dp

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

String Deletion

binary search, data structures, greedy, two pointers

Training Session

combinatorics, data structures, geometry, implementation, math

Multiplicity

data structures, dp, implementation, math, number theory

Monoblock

combinatorics, data structures, implementation, math

Minimum Array

binary search, data structures, greedy

Rorororobot

binary search, data structures, greedy, math

Square-Free Division (easy version)

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

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Correct Placement

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

Pekora and Trampoline

brute force, data structures, dp, greedy, implementation

Berry Jam

data structures, dp, greedy, implementation

Boris and His Amazing Haircut

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

Yet Another Monster Killing Problem

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

Path Prefixes

binary search, data structures, dfs and similar, trees

Exam in BerSU (hard version)

brute force, data structures, greedy, math

Gambling

data structures, dp, greedy, math

Cross Coloring

data structures, implementation, math

Omkar and Determination

data structures, dp

Valiant's New Map

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

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

Magic Triples (Easy Version)

brute force, data structures, math, number theory