Beautiful Numbers

data structures, implementation, math, two pointers

Ostap and Grasshopper

implementation, strings

Chat Online

implementation

Permutation Operations

constructive algorithms, greedy, implementation, math

A pile of stones

implementation, math

Ehab and subtraction

implementation, sortings

Find the Spruce

brute force, dp, implementation

Histogram Ugliness

greedy, implementation, math

Hexadecimal's Numbers

brute force, implementation, math

Super Agent

implementation

Increasing Sequence

constructive algorithms, implementation, math

Dorms War

brute force, implementation, strings

Take Your Places!

implementation

Cashier

implementation

Stripe

data structures, implementation

XOR-distance

bitmasks, greedy, implementation, math

Benches

binary search, implementation

Powerful array

data structures, implementation, math, two pointers

Equator

implementation

Divisor Subtraction

implementation, math, number theory

Johny Likes Numbers

implementation, math

Vertical Paths

graphs, implementation, trees

Sleeping Schedule

dp, implementation

Pineapple Incident

implementation, math

Colour the Flag

brute force, implementation

Restoring the Permutation

constructive algorithms, implementation

Twist the Permutation

brute force, constructive algorithms, implementation, math

Politics

greedy, implementation

Easter Eggs

constructive algorithms, implementation

Professor GukiZ's Robot

implementation, math

Prefix Flip (Hard Version)

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

Snowball

implementation

Golden Plate

implementation, math

Game of Ball Passing

greedy, implementation

From S To T

implementation, strings

Grid-00100

constructive algorithms, greedy, implementation

Polycarp's Practice

greedy, implementation, sortings

Doremy's IQ

binary search, constructive algorithms, greedy, implementation

Buying A House

brute force, implementation

Fighting Tournament

binary search, data structures, implementation, two pointers

Email from Polycarp

implementation, strings

Putting Bricks in the Wall

constructive algorithms, implementation

Sleuth

implementation

Luxurious Houses

implementation, math

Nastya and an Array

implementation, sortings

Settlement of Guinea Pigs

greedy, implementation, math

Unequal Array

constructive algorithms, greedy, implementation

Generous Kefa

brute force, implementation

King Escape

dfs and similar, graphs, implementation

NEKO's Maze Game

data structures, dsu, implementation

Little Girl and Maximum XOR

bitmasks, dp, greedy, implementation, math

Square Filling

constructive algorithms, greedy, implementation

Happy Birthday, Polycarp!

implementation

Binary Path

dp, greedy, implementation

Mark and His Unfinished Essay

brute force, implementation

Elimination of a Ring

constructive algorithms, greedy, implementation

Vasya and Wrestling

implementation

Coins

implementation

Alternating Current

data structures, greedy, implementation

Magic Powder - 2

binary search, implementation

Game with Chips

constructive algorithms, implementation

Cellular Network

binary search, implementation, two pointers

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Fixing Typos

greedy, implementation

Hamiltonian Wall

dp, implementation

The Doors

implementation

Three displays

brute force, dp, implementation

Integers Shop

data structures, greedy, implementation

Slightly Decreasing Permutations

greedy, implementation

Sequence Pair Weight

hashing, implementation, math

Far Relative’s Birthday Cake

brute force, combinatorics, constructive algorithms, implementation

Suffix Operations

constructive algorithms, implementation

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Alice and the Cake

data structures, greedy, implementation, sortings

Greed

greedy, implementation

Beautiful Sets of Points

constructive algorithms, implementation

Tricky Alchemy

implementation

Vika and the Bridge

binary search, data structures, greedy, implementation, math, sortings

Number Game

binary search, data structures, games, greedy, implementation

MUH and Sticks

implementation

Glory Addicts

greedy, implementation, sortings

MEX Repetition

implementation, math

Increase Subarray Sums

brute force, dp, greedy, implementation

Verse For Santa

binary search, brute force, implementation

Find Extra One

geometry, implementation

Protect Sheep

brute force, dfs and similar, graphs, implementation

Game of Life

implementation

Little Pigs and Wolves

greedy, implementation

King Moves

implementation

Easy Number Challenge

implementation, number theory

Reverse a Substring

implementation, sortings, strings

Color the Fence

data structures, dp, greedy, implementation

Snow Walking Robot

constructive algorithms, greedy, implementation

Petya and Staircases

implementation, sortings

Sail

brute force, greedy, implementation

LR-remainders

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

Elemental Decompress

constructive algorithms, greedy, implementation, sortings

Pillars

greedy, implementation

Remainder

implementation, math

Flag

implementation