Sergey and Subway

dfs and similar, dp, trees

Centroids

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

Flying Sort (Easy Version)

dp, greedy, two pointers

Nene and the Mex Operator

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

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Flag

brute force, combinatorics, dp, implementation

Winter Is Coming

dp, greedy, sortings

Game on Sum (Easy Version)

combinatorics, dp, games, math

Almost Triple Deletions

data structures, dp, greedy

Sleepy Game

dfs and similar, dp, games, graphs

Number of Components

combinatorics, data structures, dp, math

Decreasing Heights

brute force, dp

New Year and Fireworks

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

Graph Coloring

dfs and similar, dp, graphs

Pillars

binary search, data structures, dp, sortings, trees

Common Number

binary search, combinatorics, dp, math

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Count Paths

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

Animals

dp, greedy

Bottles

dp

Bookshelves

bitmasks, dp, greedy

Alyona and Strings

dp, strings

Lucky Tree

dp, dsu, trees

Minimal Segment Cover

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

Cats Transport

data structures, dp

Good Trip

combinatorics, dp, math, probabilities

Travelling Salesman Problem

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

Vladik and Memorable Trip

dp, implementation

Score of a Tree

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

Music Festival

binary search, data structures, dp, greedy, sortings

GCD on a grid

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

Hills

dp

Looking for Order

bitmasks, dp

Pencils and Boxes

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

Counting Arrays

combinatorics, dp, math, number theory

Jongmah

dp

Mahmoud and a Dictionary

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

A BIT of an Inequality

bitmasks, brute force, dp, math

Basketball Team

combinatorics, dp, math, probabilities

Recovering BST

brute force, dp, math, number theory, trees

Epidemic in Monstropolis

constructive algorithms, dp, greedy, two pointers

Travel Card

binary search, dp

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Once Again...

constructive algorithms, dp, matrices

Two Chess Pieces

dfs and similar, dp, greedy, trees

Image Preview

binary search, brute force, dp, two pointers

Beautiful Mirrors

data structures, dp, math, probabilities

Make It Increasing

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

Earn or Unlock

bitmasks, brute force, dp

Lucky Common Subsequence

dp, strings

Let's Play Osu!

dp, math, probabilities

Kaavi and Magic Spell

dp, strings

Arena

combinatorics, dp, math

Feed Cats

data structures, dp, sortings

Counting Factorizations

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

Shuffling Songs

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

Strip

binary search, data structures, dp, two pointers

Phoenix and Computers

combinatorics, dp, math

Glass Half Spilled

dp

Xor Tree

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

Cashback

data structures, dp, greedy, math

Yet Another Minimization Problem

divide and conquer, dp

Reberland Linguistics

dp, implementation, strings

Sum of Progression

brute force, data structures, dp, implementation, math

The Monster

dp, greedy, implementation, math

Team Building

bitmasks, dp, greedy, sortings

Stars Drawing (Hard Edition)

binary search, dp, greedy

Optimal Partition

data structures, dp

MADMAX

dfs and similar, dp, games, graphs

Spiders

dp, greedy, trees

Clique in the Divisibility Graph

dp, math, number theory

Weight the Tree

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

Sum of Paths

combinatorics, dp, math

Portal

brute force, data structures, dp, greedy, implementation

Coloring Brackets

dp

Unlucky Numbers

brute force, dp, greedy, implementation

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

A Game with Traps

binary search, dp, greedy, sortings

Travelling Salesman and Special Numbers

brute force, combinatorics, dp

Beautiful numbers

dp, number theory

Cow Program

dfs and similar, dp, graphs

Watching Fireworks is Fun

data structures, dp, math

Moving Chips

bitmasks, dp, greedy

Escape The Maze (hard version)

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

Vasya And The Mushrooms

dp, implementation

Robot Queries

binary search, data structures, dp, implementation

Divan and Kostomuksha (easy version)

dp, number theory

Programming Competition

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

Range Sorting (Easy Version)

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

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

How many trees?

combinatorics, divide and conquer, dp

Small GCD

bitmasks, brute force, dp, math, number theory

Compression

dp, implementation, math, number theory

Riverside Curio

data structures, dp, greedy

Fixed Points

binary search, brute force, dp

0-1-Tree

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

Li Hua and Tree

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

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Anton and Tree

dfs and similar, dp, trees

Porcelain

dp