Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

TediousLee

dp, graphs, greedy, math, trees

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Tree Shuffling

dfs and similar, dp, greedy, trees

Spy-string

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

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

K-periodic Garland

brute force, dp, greedy

Magic Tricks

*special problem, dp, graphs

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

Skyscrapers (hard version)

data structures, dp, greedy

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

New Year Parties

dp, greedy

K for the Price of One (Hard Version)

dp, greedy, sortings

Berry Jam

data structures, dp, greedy, 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

By Elevator or Stairs?

dp, shortest paths

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

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

Sequence Sorting

dp, greedy, two pointers

Make The Fence Great Again

dp

Treasure Island

dfs and similar, dp, flows, hashing

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

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

Yet Another Subarray Problem

dp, greedy, math

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Subsequences (hard version)

dp, strings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Flag

brute force, combinatorics, dp, 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

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

Compression

dp, implementation, math, number theory

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

GCD Counting

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

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 the Best Path

data structures, dp, trees

Increasing Frequency

binary search, dp, greedy

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

Slime

dp, greedy, implementation

Classy Numbers

combinatorics, dp

Permutation Game

brute force, dp, games

Playing Piano

constructive algorithms, dp

Vasya and Good Sequences

bitmasks, dp

Vasya And The Mushrooms

dp, implementation

Stars Drawing (Hard Edition)

binary search, dp, greedy

Stars Drawing (Easy Edition)

brute force, dp, greedy

Hills

dp

Yet Another Problem On a Subsequence

combinatorics, dp

Cards and Joy

dp

Roman Digits

brute force, combinatorics, dp, greedy, math

XOR-pyramid

dp

Bookshelves

bitmasks, dp, greedy

Consecutive Subsequence

dp

Destruction of a Tree

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

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Encryption (medium)

dp

Timetable

dp

Cashback

data structures, dp, greedy, math