Famil Door and Brackets

dp, strings

Relay Race

dp

Wet Shark and Blocks

dp, matrices

Queue

constructive algorithms, dp

Petr#

brute force, data structures, hashing, strings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Levko and Array

binary search, dp

Games with Rectangle

combinatorics, dp

Destruction of a Tree

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

Choosing The Commander

bitmasks, data structures, trees

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Choosing Balls

dp

Graph Cost

dp, greedy, math, number theory

The Great Equalizer

binary search, data structures, math, sortings

Doremy's Pegging Game

combinatorics, dp, math

Special Permutations

math

Not Quite Lee

combinatorics, dp, math, number theory

Obsessive String

dp, strings

Gadgets for dollars and pounds

binary search, greedy, two pointers

Fibonacci-ish

brute force, dp, hashing, implementation, math

Cycle

dfs and similar, graphs

Maximum Balanced Circle

constructive algorithms, dp, greedy, two pointers

Cards and Joy

dp

Minimization

dp, greedy, sortings

Leaving Auction

binary search, data structures

New Year and Ancient Prophecy

dp, hashing, strings

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Multicolored Markers

binary search, brute force, math, number theory

PolandBall and Polygon

data structures

Stack Sorting

constructive algorithms, data structures, greedy, implementation

One-Dimensional Puzzle

combinatorics, math, number theory

Pinball

binary search, data structures, implementation, math, two pointers

Polycarp and Snakes

brute force, implementation

Freedom of Choice

brute force, greedy, implementation

Messages

brute force, dp, greedy, probabilities, sortings

Remove Directed Edges

dfs and similar, dp, graphs

Mars rover

dfs and similar, graphs, implementation, trees

Misha and Permutations Summation

data structures

Ant on the Tree

constructive algorithms, dfs and similar, trees

Berzerk

dfs and similar, dp, games

Divisors

interactive, math, number theory

Work Group

dfs and similar, dp, graphs, strings, trees

Iahub and Permutations

combinatorics, math

TV Shows

data structures, greedy, implementation, sortings

Maxim and Array

constructive algorithms, data structures, greedy, math

Cipher

combinatorics, dp

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Candy Box (hard version)

greedy, implementation, sortings

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

Om Nom and Candies

brute force, greedy, math

Running Track

dp, greedy, strings, trees

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Multi-Colored Segments

binary search, data structures, math, sortings

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Anya and the Mysterious String

binary search, data structures

Industrial Nim

games

Wrong Answer

constructive algorithms

Interactive LowerBound

brute force, interactive, probabilities

Area of Two Circles' Intersection

geometry

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Infinite Maze

dfs and similar, graphs

Roma and Poker

dp, graphs

Yaroslav and Two Strings

combinatorics, dp

World Tour

graphs, shortest paths

Greedy Arkady

math

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

PLEASE

combinatorics, dp, implementation, math, matrices

Microtransactions (hard version)

binary search, greedy, implementation

Stripe 2

binary search, dp, sortings

Let's Play the Hat?

brute force, constructive algorithms, greedy, math

Sums of Digits

dp, greedy, implementation

Cloud Computing

data structures, greedy

Helga Hufflepuff's Cup

dp, trees

Dima and Containers

constructive algorithms, greedy, implementation

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Two out of Three

dp

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Castle Defense

binary search, data structures, greedy, two pointers

Dasha and Puzzle

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

The hat

binary search, interactive

Twisted Circuit

*special problem, brute force, implementation

A Determined Cleanup

math

Ghosts

geometry, math

The Fair Nut and Strings

greedy, strings

Water Taps

binary search, greedy, sortings

Theseus and labyrinth

graphs, implementation, shortest paths

Giving Awards

dfs and similar

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Beaver Game

dp, games, number theory

Geo Game

greedy, interactive, math

Pretty Song

math, strings

Microtransactions (easy version)

binary search, greedy

Sereja and Subsequences

data structures, dp

Little Elephant and LCM

binary search, combinatorics, dp, math

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

Restoration of string

constructive algorithms, graphs, implementation

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees