Cat Party (Easy Edition)

data structures, implementation

Colorful Bricks

combinatorics, dp, math

Bubble Sort Graph

binary search, data structures, dp

Bishwock

dp, greedy

History

sortings

Ping-Pong (Easy Version)

dfs and similar, graphs

Pasha and Tea

constructive algorithms, implementation, math, sortings

Prime Graph

constructive algorithms, greedy, math, number theory

Array

bitmasks, implementation, two pointers

Paint the Digits

constructive algorithms, greedy, implementation

Minimize the error

data structures, greedy, sortings

Duff and Weight Lifting

greedy

Balanced Substring

dp, implementation

Link/Cut Tree

brute force, implementation

Effects of Anti Pimples

combinatorics, number theory, sortings

The Fair Nut and String

combinatorics, dp, implementation

Kayaking

brute force, greedy, sortings

Nastya Is Transposing Matrices

constructive algorithms, sortings

Removing Columns

brute force, constructive algorithms, implementation

Division and Union

sortings

Bear and Three Musketeers

brute force, dfs and similar, graphs, hashing

Submarine in the Rybinsk Sea (easy edition)

combinatorics, math, number theory

Knowledge Cards

constructive algorithms, data structures

Polycarp's New Job

implementation

24 Game

constructive algorithms, greedy, math

Balanced Ternary String

greedy, strings

Maximum Absurdity

data structures, dp, implementation

Hongcow Builds A Nation

dfs and similar, graphs

Two TVs

data structures, greedy, sortings

Fly

binary search, math

Mentors

binary search, data structures, implementation

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Heaters

greedy, two pointers

Convert to Ones

brute force, greedy, implementation, math

Balance (Easy version)

brute force, data structures, implementation, number theory

New Year and Domino

dp, implementation

Almost Arithmetic Progression

brute force, implementation, math

Marvolo Gaunt's Ring

brute force, data structures, dp

Colored Boots

greedy, implementation

Kyoya and Colored Balls

combinatorics, dp, math

Math

greedy, math, number theory

Count Subrectangles

binary search, greedy, implementation

Cthulhu

dfs and similar, dsu, graphs

Discrete Acceleration

binary search, dp, implementation, math, two pointers

A + B Strikes Back

*special problem, brute force, constructive algorithms, dsu, implementation

Card Game

combinatorics, constructive algorithms, dp, games

Vus the Cossack and Numbers

constructive algorithms, greedy, math

Yet Another Array Partitioning Task

constructive algorithms, greedy, sortings

Modulo Equality

brute force, sortings

Meaningless Operations

constructive algorithms, math, number theory

A Tale of Two Lands

binary search, sortings, two pointers

Arpa’s obvious problem and Mehrdad’s terrible solution

brute force, math, number theory

Restore Modulo

implementation, math

Robot Breakout

implementation

XOR and OR

constructive algorithms, implementation, math

Vasya and Multisets

brute force, dp, greedy, implementation, math

The Child and Set

bitmasks, greedy, implementation, sortings

Binary Table (Easy Version)

constructive algorithms, implementation

Hyperset

brute force, data structures, implementation

Pairs

graphs, implementation

Nastya and Potions

dfs and similar, dp, graphs, sortings

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Nick and Array

greedy, implementation

Weights Assignment For Tree Edges

constructive algorithms, trees

Turtle vs. Rabbit Race: Optimal Trainings

binary search, implementation, math, ternary search

Gas Pipeline

dp, greedy

Pride

brute force, dp, greedy, math, number theory

Good Sequences

dp, number theory

Line Empire

binary search, brute force, dp, greedy, implementation, math

Mashmokh and Numbers

constructive algorithms, number theory

Orray

bitmasks, brute force, greedy, math, sortings

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Walking Robot

greedy

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Polycarp and Div 3

dp, greedy, number theory

Candies

binary search, implementation

Beautiful Regional Contest

greedy, implementation

k-Multiple Free Set

binary search, greedy, sortings

In Love

data structures, greedy

The Humanoid

brute force, dp, sortings

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Nikita and string

brute force, dp

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Uniqueness

binary search, brute force, implementation, two pointers

Replace With the Previous, Minimize

dsu, greedy, strings

Ayoub and Lost Array

combinatorics, dp, math

Valeriy and Deque

data structures, implementation

Search in Parallel

constructive algorithms, greedy, sortings

RGB Substring (easy version)

implementation

Divisible Numbers (easy version)

brute force, math, number theory

Ticks

greedy, implementation

Even-Odd XOR

bitmasks, constructive algorithms, greedy

Almost Increasing Subsequence

binary search, data structures, greedy

Milena and Admirer

greedy, math

Fault-tolerant Network

brute force, data structures, implementation

Even Number Addicts

dp, games, greedy, math

Binary Search

binary search, combinatorics

The Walkway

brute force, dp, greedy, math, number theory

Color the Picture

constructive algorithms, greedy, math