Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

QED's Favorite Permutation

data structures, implementation, sortings

New Rating

binary search, data structures, dp, greedy

The Endspeaker (Easy Version)

binary search, dp, graphs, greedy, implementation, two pointers

Skipping

binary search, dp, graphs, shortest paths

Tree Pruning

brute force, dfs and similar, greedy, sortings, trees

Message Transmission Error (hard version)

hashing, string suffix structures, strings, two pointers

Firefly's Queries

bitmasks, data structures, flows, math

Iris and Game on the Tree

constructive algorithms, dfs and similar, games, graphs, greedy, trees

Ruler (hard version)

binary search, interactive, ternary search

Bouquet (Hard Version)

binary search, data structures, greedy, math, sortings, two pointers

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Beautiful Array

greedy, math, number theory, sortings

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Magnitude (Hard Version)

combinatorics, dp, greedy, math

Swap Dilemma

constructive algorithms, data structures, divide and conquer, greedy, math, sortings

Beauty of the mountains

brute force, data structures, implementation, math, number theory

Paint the Tree

brute force, dfs and similar, dp, greedy, shortest paths, trees

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

XOUR

data structures, dsu, sortings

Game on Tree (Medium)

dfs and similar, dp, games, trees

Minimizing the Sum

dp, implementation

Long Inversions

brute force, greedy, implementation, sortings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Tandem Repeats?

brute force, strings, two pointers

Binary Search

binary search, constructive algorithms, greedy

Bessie's Birthday Cake (Hard Version)

geometry, greedy, math

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Chat Screenshots

combinatorics, dfs and similar, graphs

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Mathematical Problem

brute force, constructive algorithms, geometry, math

Triangle Construction

greedy, math

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

Yet Another Monster Fight

binary search, dp, greedy, implementation, math

Colorful Grid

constructive algorithms

Ones and Twos

binary search, data structures, divide and conquer, math, two pointers

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Medium Design

brute force, data structures, dp, greedy, sortings

Look Back

bitmasks, greedy

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Array Painting

constructive algorithms, greedy, two pointers

k-th equality

brute force, implementation, math

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

Don't Blame Me

bitmasks, combinatorics, dp, math

Running Miles

brute force, dp, greedy

Magic Triples (Easy Version)

brute force, data structures, math, number theory

Gardening Friends

brute force, dfs and similar, dp, graphs, trees

Long Legs

brute force, math

Climbing the Tree

binary search, math

Bouncy Ball

brute force, dfs and similar, implementation

Double Lexicographically Minimum

greedy, strings

Candy Store

greedy, math, number theory

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Yet Another Tournament

binary search, greedy, sortings

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

Quiz Master

binary search, math, number theory, sortings, two pointers

Train Splitting

constructive algorithms, graphs, greedy

Permutation Game

games

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Watch the Videos

binary search, constructive algorithms, two pointers

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Problem with Random Tests

brute force, dp, greedy, probabilities

Meta-set

brute force, combinatorics, data structures, hashing, math

Valiant's New Map

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

Even Subarrays

bitmasks, brute force, hashing, math, number theory

L-shapes

dfs and similar, implementation

Monoblock

combinatorics, data structures, implementation, math

Path Prefixes

binary search, data structures, dfs and similar, trees

Rorororobot

binary search, data structures, greedy, math

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Helping the Nature

constructive algorithms, data structures, greedy

The Third Problem

combinatorics, constructive algorithms, math

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Fake Plastic Trees

dfs and similar, dp, greedy, trees

Gambling

data structures, dp, greedy, math

Shifting String

graphs, math, number theory, strings

Manipulating History

constructive algorithms, greedy, strings

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Traps

constructive algorithms, greedy, sortings

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Tokitsukaze and Meeting

data structures, implementation, math

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Very Suspicious

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

Water the Trees

binary search, greedy, math

Promising String (easy version)

brute force, implementation, math, strings

Shinju and the Lost Permutation

constructive algorithms, math

Cross Coloring

data structures, implementation, math

Peculiar Movie Preferences

greedy, strings

Monsters And Spells

binary search, data structures, dp, greedy, implementation, math, two pointers

Road Optimization

dp

Hidden Permutations

dfs and similar, interactive, math

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings