Acacius and String

brute force, implementation, strings

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

Omkar and Baseball

constructive algorithms, math

Grid-00100

constructive algorithms, greedy, implementation

Number Game

games, math, number theory

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

Task On The Board

constructive algorithms, greedy, implementation, sortings

Palindromic Paths

greedy, math

Solve The Maze

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

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Game On Leaves

games, trees

Subsequence Hate

implementation, strings

Johnny and Another Rating Drop

bitmasks, greedy, math

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Mixing Water

binary search, math

Celex Update

math

Game With Array

constructive algorithms, math

Count Triangles

binary search, implementation, math, two pointers

Simple Polygon Embedding

binary search, geometry, math, ternary search

Constructing the Array

constructive algorithms, data structures, sortings

Special Permutation

constructive algorithms

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Special Elements

brute force, implementation, two pointers

Skier

data structures, implementation

Orac and Models

dp, math, number theory

Orac and LCM

data structures, math, number theory

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Magic Tricks

*special problem, dp, graphs

Constructing the Dungeon

*special problem, graphs, greedy

Spring Cleaning

*special problem, greedy, sortings

Boot Camp

*special problem, greedy

Hilbert's Hotel

math, number theory, sortings

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Yet Another Counting Problem

math, number theory

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Edge Weight Assignment

bitmasks, constructive algorithms, dfs and similar, greedy, math, trees

Powered Addition

greedy, math

Xenia and Colorful Gems

binary search, greedy, math, sortings, two pointers

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Three Blocks Palindrome (easy version)

binary search, brute force, data structures, dp, two pointers

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Circle of Monsters

brute force, constructive algorithms, greedy, math

Eugene and an array

binary search, data structures, implementation, two pointers

Walk on Matrix

bitmasks, constructive algorithms, math

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Composite Coloring

brute force, constructive algorithms, greedy, math, number theory

Dreamoon Likes Permutations

implementation, math

Dreamoon Likes Sequences

bitmasks, combinatorics, math

Dreamoon Likes Coloring

constructive algorithms, greedy, implementation, math

Carousel

constructive algorithms, dp, graphs, greedy, math

Count The Blocks

combinatorics, dp, math

Game with Chips

constructive algorithms, implementation

Prefix-Suffix Palindrome (Hard version)

binary search, greedy, hashing, string suffix structures, strings

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Maximum White Subtree

dfs and similar, dp, graphs, trees

Sleeping Schedule

dp, implementation

Pair of Topics

binary search, data structures, sortings, two pointers

Count Subrectangles

binary search, greedy, implementation

Remove Adjacent

brute force, constructive algorithms, greedy, strings

Navigation System

dfs and similar, graphs, shortest paths

Journey Planning

data structures, dp, greedy, math, sortings

Primitive Primes

constructive algorithms, math, ternary search

String Modification

brute force, constructive algorithms, implementation, sortings, strings

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Different Rules

constructive algorithms, greedy, implementation, math

Count the Arrays

combinatorics, math

Adding Powers

bitmasks, greedy, implementation, math, number theory, ternary search

Recommendations

data structures, greedy, sortings

Cow and Message

brute force, dp, math, strings

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

Air Conditioner

dp, greedy, implementation, sortings, two pointers

Perfect Keyboard

dfs and similar, greedy, implementation

National Project

math

Ayoub's function

binary search, combinatorics, greedy, math, strings

Motarack's Birthday

binary search, greedy, ternary search

Aerodynamic

geometry

Anu Has a Function

brute force, greedy, math

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Fight with Monsters

greedy, sortings

Yet Another Walking Robot

data structures, implementation

Same GCDs

math, number theory

Obtain The String

dp, greedy, strings

Infinite Prefixes

math, strings

MEX maximizing

data structures, greedy, implementation, math

Aroma's Search

brute force, constructive algorithms, geometry, greedy, implementation

NEKO's Maze Game

data structures, dsu, implementation