Black Friday

*special problem, implementation

Polycarp and the Language of Gods

*special problem, implementation, two pointers

String Reversal

data structures, greedy, strings

String Deletion

binary search, data structures, greedy, two pointers

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Chess Cheater

greedy, implementation, sortings

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Huge Boxes of Animal Toys

constructive algorithms

Flamingoes of Mystery

interactive

Arena of Greed

games, greedy

Years

data structures, sortings

Lonely Numbers

binary search, math, number theory, two pointers

Valuable Paper

binary search, flows, graph matchings, graphs

Bargain

combinatorics, dp, math

Nice Matrix

greedy, implementation, math

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Palindromifier

constructive algorithms, strings

Rescue Nibel!

combinatorics, data structures, sortings

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Killjoy

greedy, implementation, math

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Negative Prefixes

greedy, sortings

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Bouncing Ball

brute force, dp, implementation

Shurikens

data structures, greedy, implementation

Perform Easily

binary search, brute force, dp, implementation, sortings, two pointers

Peaceful Rooks

dfs and similar, dsu, graphs

Two Platforms

binary search, dp, sortings, two pointers

Decrease the Sum of Digits

greedy, math

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Arrays Sum

constructive algorithms, greedy, math

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Big Vova

brute force, greedy, math, number theory

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Tree Tag

dfs and similar, dp, games, trees

Balanced Bitstring

implementation, strings

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Mere Array

constructive algorithms, math, number theory, sortings

Zigzags

brute force, combinatorics, data structures, math, two pointers

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

RPG Protagonist

brute force, greedy, math

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Colored Rectangles

dp, greedy, sortings

Good Subarrays

data structures, dp, math

Power Sequence

brute force, math, number theory, sortings

Stoned Game

brute force, constructive algorithms, games, greedy

Multiples of Length

constructive algorithms, greedy, number theory

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Boboniu Chats with Du

dp, greedy, sortings, two pointers

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Omkar and Bed Wars

dp, greedy

Cyclic Permutations

combinatorics, dp, graphs, math

Good String

brute force, dp, greedy, two pointers

Array Walk

brute force, dp, greedy

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

a-Good String

bitmasks, brute force, divide and conquer, dp, implementation

Koa and the Beach (Easy Version)

brute force, dp, greedy

GameGame

bitmasks, constructive algorithms, dp, games, greedy, math

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Unmerge

dp

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Create The Teams

brute force, dp, greedy, implementation, sortings

Universal Solution

greedy

Dubious Cyrpto

binary search, brute force, math, number theory

Acacius and String

brute force, implementation, strings

Replace by MEX

brute force, constructive algorithms, sortings

Element Extermination

constructive algorithms, data structures, greedy

Reading Books (easy version)

data structures, greedy, sortings

Zero Remainder Array

math, sortings, two pointers

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Pluses and Minuses

math

Omkar and Baseball

constructive algorithms, math

Omkar and Last Class of Math

greedy, math, number theory

Asterism (Easy Version)

binary search, brute force, combinatorics, math, number theory, sortings

Grid-00100

constructive algorithms, greedy, implementation

A Cookie for You

greedy, implementation, math

Number Game

games, math, number theory

TediousLee

dp, graphs, greedy, math, trees

RationalLee

greedy, math, sortings, two pointers

AND, OR and square sum

bitmasks, greedy, math

Even Picture

constructive algorithms

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

Necklace Assembly

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

Task On The Board

constructive algorithms, greedy, implementation, sortings

Social Distance

constructive algorithms, greedy, math

Palindromic Paths

greedy, math

Shuffle

math, two pointers

Maximum Subsequence Value

brute force, constructive algorithms

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Trouble Sort

constructive algorithms, implementation

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Most socially-distanced subsequence

greedy, two pointers

Game On Leaves

games, trees

Subsequence Hate

implementation, strings