Good Numbers (easy version)

brute force, greedy, implementation

Chat Order

*special problem, binary search, constructive algorithms, data structures, sortings

A Good Contest

implementation

Wonderful Coloring - 2

binary search, constructive algorithms, data structures, greedy

Watchmen

data structures, geometry, math

Elimination

greedy, math

Keanu Reeves

strings

Make it Alternating

combinatorics, dp, greedy

Competitive Programmer

chinese remainder theorem, math

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Summer Camp

implementation

Absolute Sorting

constructive algorithms, math

Running for Gold

combinatorics, graphs, greedy, sortings

Helmets in Night Light

greedy, sortings

Multiples of Length

constructive algorithms, greedy, number theory

ConneR and the A.R.C. Markland-N

binary search, brute force, implementation

Neko Finds Grapes

greedy, implementation, math

Two Shuffled Sequences

constructive algorithms, sortings

The Delivery Dilemma

binary search, greedy, sortings

Knapsack

constructive algorithms, greedy, sortings

Killjoy

greedy, implementation, math

Diverse Substring

implementation, strings

Left-handers, Right-handers and Ambidexters

implementation, math

Prison Break

brute force, math

Card Exchange

constructive algorithms, games, greedy

Particles

dp, greedy, implementation, math

Balls of Steel

brute force, geometry, greedy

Prefix Sum Addicts

constructive algorithms, greedy, math, sortings

Parallel Projection

geometry, math

Kalindrome Array

greedy, two pointers

Blackjack

implementation

Digital root

math, number theory

Olympiad

implementation, sortings

Array Eversion

greedy

Balanced Bitstring

implementation, strings

Sage's Birthday (hard version)

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

Playing in a Casino

math, sortings

Swap and Reverse

constructive algorithms, greedy, sortings, strings

Two Out of Three

constructive algorithms

Balanced Tunnel

data structures, sortings, two pointers

Beautiful String

constructive algorithms, greedy

Prefix Sum Primes

constructive algorithms, greedy, math, number theory

Infinite Sequence

math

Find Marble

implementation

Romaji

implementation, strings

Grid Reconstruction

constructive algorithms, greedy

Little Elephant and Function

implementation, math

Another One Bites The Dust

greedy

Cow and Haybales

greedy, implementation

Diverse Garland

constructive algorithms, dp, greedy

Suits

brute force, greedy, math

Mainak and Interesting Sequence

bitmasks, constructive algorithms, math

Death Note

greedy, implementation, math

Divide and Equalize

math, number theory

Make Them Odd

greedy, number theory

Bear and Friendship Condition

dfs and similar, dsu, graphs

Creating a Character

binary search, math

Shifts and Sorting

constructive algorithms, greedy

Lucky Ticket

implementation

Mathematical Addition

math

Li Hua and Pattern

constructive algorithms, greedy

Split Sort

greedy, math, sortings

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

MEX and Array

brute force, dp, greedy, math

New Year and Counting Cards

brute force, implementation

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Paprika and Permutation

binary search, greedy, math, sortings

Toy Army

math, number theory

Finding Sasuke

constructive algorithms, math

Doggo Recoloring

implementation, sortings

Price Maximization

binary search, greedy, math, two pointers

Maximum Strength

greedy, math

Parity

math

Character Swap (Easy Version)

strings

Cyclic Permutations

combinatorics, dp, graphs, math

Birthday

binary search, greedy, sortings

Vasya and Chocolate

implementation, math

Stickers and Toys

math

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Trust Nobody

brute force, greedy, implementation, sortings

Ropewalkers

math

Monsters (easy version)

brute force, greedy

Little Pony and Crystal Mine

implementation

Masha and a Beautiful Tree

dfs and similar, divide and conquer, graphs, sortings, trees

2D Traveling

geometry, math, shortest paths, sortings

Temporarily unavailable

implementation, math

Lamps

greedy, sortings

Game with string

data structures, implementation, math

Lucky Numbers (easy)

binary search, bitmasks, brute force

Grandma Capa Knits a Scarf

brute force, data structures, greedy, strings, two pointers

Madoka and Underground Competitions

constructive algorithms, implementation

Virus

greedy, implementation, sortings

Yet Another Walking Robot

data structures, implementation

Qpwoeirut And The City

dp, flows, greedy, implementation

Bestie

brute force, combinatorics, constructive algorithms, implementation, math, number theory

Toy Blocks

binary search, greedy, math, sortings

Strings Equalization

strings

Long Number

greedy

Equality

implementation, strings

Equal XOR

bitmasks, constructive algorithms