Triangle Coloring

combinatorics, math

Remove the Bracket

dp, greedy, math

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Least Prefix Sum

data structures, greedy

Flexible String

bitmasks, brute force, strings

Interesting Sequence

bitmasks, math

Same Count One

brute force, constructive algorithms, greedy, implementation, two pointers

Hossam and Trainees

greedy, math, number theory

Lucky Chains

math, number theory

Factorial Divisibility

math, number theory

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Sending a Sequence Over the Network

dp

Meeting on the Line

binary search, geometry, greedy, implementation, math, ternary search

Counting Rectangles

brute force, data structures, dp, implementation

Color with Occurrences

brute force, data structures, dp, greedy, strings

Doremy's IQ

binary search, constructive algorithms, greedy, implementation

Good Key, Bad Key

bitmasks, brute force, dp, greedy, math

Split Into Two Sets

dfs and similar, dsu, graphs

Fixed Point Guessing

binary search, constructive algorithms, interactive

Infected Tree

dfs and similar, dp, trees

The Enchanted Forest

brute force, greedy

Binary String

binary search, greedy, strings, two pointers

Tokitsukaze and Strange Inequality

brute force, data structures, dp

Insert a Progression

brute force, constructive algorithms, greedy

Tree Infection

binary search, greedy, sortings, trees

Matrix and Shifts

brute force, constructive algorithms, greedy, implementation

Maximum Product Strikes Back

brute force, implementation, math, two pointers

388535 (Easy Version)

bitmasks, math

Make Them Equal

dp, greedy

Strange Test

binary search, bitmasks, brute force, dp, math

Balanced Stone Heaps

binary search, greedy

Set or Decrease

binary search, brute force, greedy, sortings

Menorah

brute force, graphs, greedy, math

X-Magic Pair

math, number theory

Keshi Is Throwing a Party

binary search, greedy

Social Network

dsu, graphs, greedy, implementation, trees

Robot on the Board 1

implementation

Moderate Modular Mode

constructive algorithms, math, number theory

Gardener and Tree

brute force, data structures, dfs and similar, greedy, implementation, trees

Vupsen, Pupsen and 0

constructive algorithms, math

Carrying Conundrum

bitmasks, combinatorics, dp, math

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Strange Function

math, number theory

PriceFixed

binary search, greedy, implementation, sortings, two pointers

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Sequence Pair Weight

hashing, implementation, math

Potions (Hard Version)

data structures, greedy

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Guess the K-th Zero (Easy version)

binary search, interactive

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Product 1 Modulo N

greedy, number theory

Add One

dp, matrices

Permutation by Sum

brute force, greedy, math

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

DMCA

*special problem, implementation, number theory

Balance the Bits

constructive algorithms, greedy

Planar Reflections

brute force, data structures, dp

k-LCM (hard version)

constructive algorithms, math

Guessing the Greatest (easy version)

binary search, interactive

Basic Diplomacy

brute force, constructive algorithms, greedy, implementation

Fence Painting

brute force, constructive algorithms, greedy

Longest Simple Cycle

dp, graphs, greedy

Advertising Agency

combinatorics, math, sortings

Building a Fence

dp, greedy, implementation, two pointers

The Robot

brute force, implementation

Divide and Summarize

binary search, brute force, data structures, divide and conquer, implementation, sortings

Row GCD

math, number theory

Sequence and Swaps

dp, greedy, sortings

Radio Towers

combinatorics, dp, math

Minimal Height Tree

graphs, greedy, shortest paths, trees

Black Friday

*special problem, implementation

Lonely Numbers

binary search, math, number theory, two pointers

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Good Subarrays

data structures, dp, math

Multiples of Length

constructive algorithms, greedy, number theory

Boboniu and Bit Operations

bitmasks, brute force, dp, greedy

Array Walk

brute force, dp, greedy

Reading Books (easy version)

data structures, greedy, sortings

Maximum Sum on Even Positions

divide and conquer, dp, greedy, implementation

Grid-00100

constructive algorithms, greedy, implementation

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Game On Leaves

games, trees

Celex Update

math

Constructing the Array

constructive algorithms, data structures, sortings

Special Permutation

constructive algorithms

Orac and LCM

data structures, math, number theory

Phoenix and Distribution

constructive algorithms, greedy, sortings, strings

Constructing the Dungeon

*special problem, graphs, greedy

Spring Cleaning

*special problem, greedy, sortings

Hilbert's Hotel

math, number theory, sortings

Yet Another Counting Problem

math, number theory

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Circle of Monsters

brute force, constructive algorithms, greedy, math

Game with Chips

constructive algorithms, implementation

Remove Adjacent

brute force, constructive algorithms, greedy, strings

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Perfect Keyboard

dfs and similar, greedy, implementation