Breaking Good

dfs and similar, dp, graphs, shortest paths

Portals

data structures, dp, greedy, implementation, sortings

Rectangular Congruence

constructive algorithms, number theory

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Berland Beauty

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

Games with Rectangle

combinatorics, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Special Permutations

math

Fibonacci-ish

brute force, dp, hashing, implementation, math

Editor

data structures, implementation

Game of Stones

bitmasks, dp, games

Pathwalks

data structures, dp, graphs

Minimization

dp, greedy, sortings

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Not Quite Lee

combinatorics, dp, math, number theory

Leaving Auction

binary search, data structures

New Year and Ancient Prophecy

dp, hashing, strings

Tree with Small Distances

dp, graphs, greedy

Polycarp and Snakes

brute force, implementation

Shovels Shop

dp, greedy, sortings

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

PolandBall and Polygon

data structures

Paint the Tree

dp, sortings, trees

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Sad powers

binary search, math, number theory

Promising String (hard version)

data structures, implementation, math, strings

Lynyrd Skynyrd

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

Petr#

brute force, data structures, hashing, strings

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Stack Sorting

constructive algorithms, data structures, greedy, implementation

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

MST Unification

binary search, dsu, graphs, greedy

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Gadgets for dollars and pounds

binary search, greedy, two pointers

Multicolored Markers

binary search, brute force, math, number theory

Doremy's Pegging Game

combinatorics, dp, math

Relay Race

dp

Colorings and Dominoes

combinatorics, dp, greedy, math

String

brute force, constructive algorithms, hashing, implementation, string suffix structures, strings

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Grime Zoo

brute force, greedy, implementation, strings

MEX vs MED

math, two pointers

Cycle

dfs and similar, graphs

Graph Cost

dp, greedy, math, number theory

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Tree Constructing

constructive algorithms, graphs

Maxim and Array

constructive algorithms, data structures, greedy, math

Two strings

binary search, hashing, strings, two pointers

Range Deleting

binary search, combinatorics, data structures, two pointers

Mars rover

dfs and similar, graphs, implementation, trees

Choosing The Commander

bitmasks, data structures, trees

Berzerk

dfs and similar, dp, games

Underground Lab

constructive algorithms, dfs and similar, graphs

TV Shows

data structures, greedy, implementation, sortings

Cards and Joy

dp

Misha and Permutations Summation

data structures

Divisors

interactive, math, number theory

Om Nom and Candies

brute force, greedy, math

Lunar New Year and Red Envelopes

data structures, dp

You Are Given a WASD-string...

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

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Candy Box (hard version)

greedy, implementation, sortings

Iahub and Permutations

combinatorics, math

Hossam and (sub-)palindromic tree

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

Messages

brute force, dp, greedy, probabilities, sortings

Running Track

dp, greedy, strings, trees

Subway Pursuit

binary search, interactive, probabilities

Work Group

dfs and similar, dp, graphs, strings, trees

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Perfect Groups

dp, math, number theory

Sheikh (Hard Version)

binary search, bitmasks, brute force, greedy, implementation, two pointers

Wi-Fi

data structures, dp, greedy

Neko and Aki's Prank

dp, greedy, trees

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Rain

binary search, brute force, data structures, geometry, greedy, implementation, math

Sand Fortress

binary search, constructive algorithms, math

Count Binary Strings

data structures, dp

Flexible String Revisit

combinatorics, dp, math, probabilities

Cipher

combinatorics, dp

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Cartons of milk

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

Well played!

greedy, sortings

The Queue

brute force, greedy

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Staircases

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

Wrong Answer

constructive algorithms

Remove Directed Edges

dfs and similar, dp, graphs

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Fedor and coupons

binary search, data structures, greedy, sortings

Interactive LowerBound

brute force, interactive, probabilities

Greedy Arkady

math

Yaroslav and Time

binary search, graphs, shortest paths

Ant on the Tree

constructive algorithms, dfs and similar, trees

Treasure Hunting

binary search, dp, greedy, implementation

Carry Bit

combinatorics, math

Maximum Balanced Circle

constructive algorithms, dp, greedy, two pointers