Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Masha-forgetful

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

XOR Equation

dp, math

Arthur and Table

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

Sequence Sorting

dp, greedy, two pointers

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Palindromic characteristics

brute force, dp, hashing, strings

Maximum Subarray

data structures, dp, greedy, two pointers

Playing Piano

constructive algorithms, dp

Dima and Hares

dp, greedy

Yet Another Division Into Teams

dp, greedy, sortings

Cleaning

data structures, dp, greedy, math

Babaei and Birthday Cake

data structures, dp

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Valid Sets

dfs and similar, dp, math, trees

Koa and the Beach (Easy Version)

brute force, dp, greedy

The Fair Nut and Rectangles

data structures, dp, geometry

Dynasty Puzzles

dp

Porcelain

dp

Kay and Snowflake

data structures, dfs and similar, dp, trees

Connecting Universities

dfs and similar, dp, graphs, trees

Jon Snow and his Favourite Number

brute force, dp, implementation, sortings

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Anton and Tree

dfs and similar, dp, trees

Small GCD

bitmasks, brute force, dp, math, number theory

Li Hua and Tree

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

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Robot Queries

binary search, data structures, dp, implementation

0-1-Tree

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

Programming Competition

dfs and similar, dp, graph matchings, greedy, trees

Fixed Points

binary search, brute force, dp

Riverside Curio

data structures, dp, greedy

Compression

dp, implementation, math, number theory

How many trees?

combinatorics, divide and conquer, dp

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

A BIT of an Inequality

bitmasks, brute force, dp, math

Escape The Maze (hard version)

dfs and similar, dp, greedy, shortest paths, trees

Divan and Kostomuksha (easy version)

dp, number theory

Travelling Salesman and Special Numbers

brute force, combinatorics, dp

Watching Fireworks is Fun

data structures, dp, math

A Game with Traps

binary search, dp, greedy, sortings

Vasya And The Mushrooms

dp, implementation

Moving Chips

bitmasks, dp, greedy

Beautiful numbers

dp, number theory

Cow Program

dfs and similar, dp, graphs

Unlucky Numbers

brute force, dp, greedy, implementation

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Coloring Brackets

dp

Portal

brute force, data structures, dp, greedy, implementation

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Sum of Paths

combinatorics, dp, math

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Clique in the Divisibility Graph

dp, math, number theory

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Spiders

dp, greedy, trees

Team Building

bitmasks, dp, greedy, sortings

MADMAX

dfs and similar, dp, games, graphs

Optimal Partition

data structures, dp

Stars Drawing (Hard Edition)

binary search, dp, greedy

Sum of Progression

brute force, data structures, dp, implementation, math

Cashback

data structures, dp, greedy, math

The Monster

dp, greedy, implementation, math

Yet Another Minimization Problem

divide and conquer, dp

Feed Cats

data structures, dp, sortings

Reberland Linguistics

dp, implementation, strings

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Glass Half Spilled

dp

Phoenix and Computers

combinatorics, dp, math

Counting Factorizations

combinatorics, divide and conquer, dp, math, number theory

Let's Play Osu!

dp, math, probabilities

Strip

binary search, data structures, dp, two pointers

Earn or Unlock

bitmasks, brute force, dp

Arena

combinatorics, dp, math

Lucky Common Subsequence

dp, strings

Kaavi and Magic Spell

dp, strings

Make It Increasing

binary search, constructive algorithms, data structures, dp, implementation

Beautiful Mirrors

data structures, dp, math, probabilities

Two Chess Pieces

dfs and similar, dp, greedy, trees

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Travel Card

binary search, dp

Image Preview

binary search, brute force, dp, two pointers

Once Again...

constructive algorithms, dp, matrices

Recovering BST

brute force, dp, math, number theory, trees

Epidemic in Monstropolis

constructive algorithms, dp, greedy, two pointers

Basketball Team

combinatorics, dp, math, probabilities

Mahmoud and a Dictionary

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

Counting Arrays

combinatorics, dp, math, number theory

Jongmah

dp

Pencils and Boxes

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

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Looking for Order

bitmasks, dp

Good Trip

combinatorics, dp, math, probabilities

Music Festival

binary search, data structures, dp, greedy, sortings

Cats Transport

data structures, dp

Score of a Tree

bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees

Hills

dp

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees