Magic Tricks

*special problem, dp, graphs

Alternating Subsequence

dp, greedy, two pointers

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Three Blocks Palindrome (easy version)

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

Carousel

constructive algorithms, dp, graphs, greedy, math

Count The Blocks

combinatorics, dp, math

Maximum White Subtree

dfs and similar, dp, graphs, trees

Sleeping Schedule

dp, implementation

Journey Planning

data structures, dp, greedy, math, sortings

Homecoming

binary search, dp, greedy, strings

Skyscrapers (hard version)

data structures, dp, greedy

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Cow and Message

brute force, dp, math, strings

Air Conditioner

dp, greedy, implementation, sortings, two pointers

String Coloring (hard version)

data structures, dp

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Obtain The String

dp, greedy, strings

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Minimax Problem

binary search, bitmasks, dp

Two Arrays

combinatorics, dp

Garland

dp, greedy, sortings

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Just Eat It!

dp, greedy, implementation

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

New Year Parties

dp, greedy

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Berry Jam

data structures, dp, greedy, implementation

As Simple as One and Two

dp, greedy

Remove One Element

brute force, dp

Yet Another Broken Keyboard

combinatorics, dp, implementation

Domino for Young

dp, greedy, math

A Game with Traps

binary search, dp, greedy, sortings

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Yet Another Division Into Teams

dp, greedy, sortings

Sweets Eating

dp, greedy, math, sortings

By Elevator or Stairs?

dp, shortest paths

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Constanze's Machine

dp

Restricted RPS

constructive algorithms, dp, greedy

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Ivan the Fool and the Probability Theory

combinatorics, dp, math

AB-string

binary search, combinatorics, dp, strings

Standard Free2play

dp, greedy, math

Pipes

dp, implementation

Sequence Sorting

dp, greedy, two pointers

Make The Fence Great Again

dp

The Number of Products

combinatorics, dp, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Gas Pipeline

dp, greedy

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

You Are Given a Decimal String...

brute force, dp, shortest paths

White Lines

brute force, data structures, dp, implementation, two pointers

Block Adventure

dp, greedy

Yet Another Subarray Problem

dp, greedy, math

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Basketball Exercise

dp

Candies!

data structures, dp, implementation, math

Subsequences (hard version)

dp, strings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Flag

brute force, combinatorics, dp, implementation

WOW Factor

dp, strings

Lose it!

dp, greedy, implementation

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Maximum Balanced Circle

constructive algorithms, dp, greedy, two pointers

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Serval and Rooted Tree

binary search, dfs and similar, dp, greedy, trees

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

Minimum Triangulation

dp, greedy, math

K Balanced Teams

dp, sortings, two pointers

Clear the String

dp

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Pavel and Triangles

brute force, dp, fft, greedy, ternary search

Flood Fill

dp

Sasha and a Bit of Relax

dp, implementation

Diverse Garland

constructive algorithms, dp, greedy

Compression

dp, implementation, math, number theory

Ayoub and Lost Array

combinatorics, dp, math

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Petr and a Combination Lock

bitmasks, brute force, dp

Easy Problem

dp

Tree with Maximum Cost

dfs and similar, dp, trees

New Year and the Permutation Concatenation

combinatorics, dp, math

The Fair Nut and String

combinatorics, dp, implementation

The Fair Nut and the Best Path

data structures, dp, trees

Increasing Frequency

binary search, dp, greedy

Colorful Bricks

combinatorics, dp, math

Pictures with Kittens (easy version)

dp

Array Without Local Maximums

dp

Multiplicity

data structures, dp, implementation, math, number theory

Sergey and Subway

dfs and similar, dp, trees

Tanya and Colored Candies

*special problem, dp

Decorate Apple Tree

constructive algorithms, dfs and similar, dp, graphs, greedy, sortings, trees

Bicolorings

bitmasks, dp