Phoenix and Berries

brute force, dp, greedy, math

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Kaavi and Magic Spell

dp, strings

Team Building

bitmasks, dp, greedy, sortings

Array Shrinking

dp, greedy

Tourism

dp, graphs, probabilities

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

Erase Subsequences

dp, strings

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Two Bracket Sequences

dp, strings, two pointers

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Beautiful Mirrors

data structures, dp, math, probabilities

Economic Difficulties

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

Tournament

brute force, dp, greedy

Antenna Coverage

data structures, dp, greedy, sortings

Tiling Terrace

brute force, dp

Cleaning Robots

dp, trees

Voting (Easy Version)

data structures, dp, greedy

Discarding Game

dp, greedy, two pointers

Maximum Weight Subset

dp, trees

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Hyakugoku and Ladders

dp, probabilities, shortest paths

Sum Balance

bitmasks, dfs and similar, dp, graphs

The Maximum Subtree

dfs and similar, dp, graphs, trees

Keyboard Purchase

bitmasks, dp

Balanced Binary Search Trees

dp, math

Yet Another Substring Reverse

bitmasks, dp

Another Filling the Grid

combinatorics, dp, math

Wrong Answer on test 233 (Easy Version)

dp

Rock Is Push

binary search, dp

Paint the Tree

dp, sortings, trees

Tourism

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

Wi-Fi

data structures, dp, greedy

Marbles

bitmasks, dp

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Complete the Projects (hard version)

dp, greedy

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Treasure Hunting

binary search, dp, greedy, implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Rectangle Painting 1

dp

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Tree Painting

dfs and similar, dp, trees

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Product Oriented Recurrence

dp, math, matrices, number theory

Complete Mirror

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

Short Colorful Strip

combinatorics, dfs and similar, dp

Destroy it!

dp, implementation, sortings

Minimal Segment Cover

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

Nauuo and Pictures (easy version)

dp, probabilities

And Reachability

bitmasks, dp

Mysterious Code

dp, strings

Card Bag

dp, math, probabilities

0-1-Tree

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

Shovels Shop

dp, greedy, sortings

Neko and Aki's Prank

dp, greedy, trees

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Number of Components

combinatorics, data structures, dp, math

Three Religions

dp, implementation, strings

Two Merged Sequences

dp, greedy

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Steps to One

dp, math, number theory, probabilities

Greedy Subsequences

data structures, dp, trees

Knapsack

dfs and similar, dp, greedy

String Multiplication

dp, greedy, strings

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Compress String

dp, strings

Magic Gems

dp, math, matrices

Jongmah

dp

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Vasya and Maximum Profit

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

Vasya and Binary String

dp

Lunar New Year and Red Envelopes

data structures, dp

Helping Hiasat

bitmasks, brute force, dp, meet-in-the-middle

Trucks and Cities

binary search, dp

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Makoto and a Blackboard

dp, math, number theory, probabilities

Lucky Tickets

divide and conquer, dp, fft

Inversion Expectation

dp, math, probabilities

Vasya and Array

dp

Alice the Fan

dp

Ehab and a component choosing problem

dp, greedy, math, trees

The Fair Nut and Rectangles

data structures, dp, geometry

Pictures with Kittens (hard version)

data structures, dp

Segment Sum

bitmasks, combinatorics, dp, math

Streets and Avenues in Berhattan

dp

Monsters and Potions

brute force, dp, greedy, implementation

Find a Number

dp, graphs, number theory, shortest paths

Yet another 2D Walking

dp

Three Pieces

dfs and similar, dp, shortest paths

Split the Tree

binary search, data structures, dp, greedy, trees

Optimal Polygon Perimeter

dp, geometry

Vasya and Magic Matrix

dp, math, probabilities

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Vasya and Maximum Matching

dp, trees

The Unbearable Lightness of Weights

dp, math

Tree with Small Distances

dp, graphs, greedy