Vasya and String

binary search, dp, strings, two pointers

Journey

dfs and similar, dp, graphs, probabilities, trees

Remove One Element

brute force, dp

Air Conditioner

dp, greedy, implementation, sortings, two pointers

Maximum width

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

Cyclic Permutations

combinatorics, dp, graphs, math

Sweets Eating

dp, greedy, math, sortings

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Diluc and Kaeya

data structures, dp, hashing, number theory

Backspace

dp, greedy, strings, two pointers

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Pipes

dp, implementation

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Data Structures Fan

binary search, bitmasks, data structures, dp

Palindrome Basis

brute force, dp, math, number theory

Tenzing and Balls

dp

Cow and Message

brute force, dp, math, strings

Living Sequence

binary search, dp, math, number theory

Block Sequence

dp

Random Events

dp, math, probabilities

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

The Walkway

brute force, dp, greedy, math, number theory

Even Number Addicts

dp, games, greedy, math

Ayoub and Lost Array

combinatorics, dp, math

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Nikita and string

brute force, dp

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

The Humanoid

brute force, dp, sortings

Polycarp and Div 3

dp, greedy, number theory

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Good Sequences

dp, number theory

Line Empire

binary search, brute force, dp, greedy, implementation, math

Pride

brute force, dp, greedy, math, number theory

Gas Pipeline

dp, greedy

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Nastya and Potions

dfs and similar, dp, graphs, sortings

Vasya and Multisets

brute force, dp, greedy, implementation, math

Card Game

combinatorics, constructive algorithms, dp, games

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Kyoya and Colored Balls

combinatorics, dp, math

Marvolo Gaunt's Ring

brute force, data structures, dp

New Year and Domino

dp, implementation

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Maximum Absurdity

data structures, dp, implementation

The Fair Nut and String

combinatorics, dp, implementation

Balanced Substring

dp, implementation

Bishwock

dp, greedy

Bubble Sort Graph

binary search, data structures, dp

Colorful Bricks

combinatorics, dp, math

Dasha and Password

brute force, dp, implementation

Little Elephant and Interval

binary search, combinatorics, dp

Did you mean...

dp, greedy, implementation

Pie Rules

dp, games

Almost Arithmetical Progression

brute force, dp

Qualification Rounds

bitmasks, brute force, constructive algorithms, dp

Palindrome pairs

*special problem, brute force, dp, strings

Bargaining Table

brute force, dp

Dynasty Puzzles

dp

Clique in the Divisibility Graph

dp, math, number theory

Elimination

dp, implementation, math

Cinema Cashier

dp, implementation

IT Restaurants

dfs and similar, dp, trees

Train

dp, games, greedy

k-Tree

dp, implementation, trees

Good Subarrays

data structures, dp, math

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Array Walk

brute force, dp, greedy

Hard problem

dp, strings

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Add One

dp, matrices

Make Them Equal

dp, greedy

Obtain The String

dp, greedy, strings

Two Arrays

combinatorics, dp

DZY Loves Sequences

dp, implementation, two pointers

Strange Test

binary search, bitmasks, brute force, dp, math

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Sequence and Swaps

dp, greedy, sortings

Another Problem on Strings

binary search, brute force, dp, math, strings, two pointers

Carrying Conundrum

bitmasks, combinatorics, dp, math

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Longest Simple Cycle

dp, graphs, greedy

To Become Max

binary search, brute force, data structures, dp

Sending a Sequence Over the Network

dp

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Building a Fence

dp, greedy, implementation, two pointers

Infected Tree

dfs and similar, dp, trees

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Timofey and a tree

dfs and similar, dp, dsu, graphs, implementation, trees

Counting Rectangles

brute force, data structures, dp, implementation

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

K for the Price of One (Hard Version)

dp, greedy, sortings

Chain Reaction

binary search, dp

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Hits Different

data structures, dp, implementation, math

Planar Reflections

brute force, data structures, dp

Hard Process

binary search, dp, two pointers