Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Michael and Charging Stations

binary search, dp, greedy

Lucky Arrays

data structures

Lihmuf Balling

binary search, brute force, math

Forming Groups

Cinema

brute force, data structures

Access Levels

bitmasks, dsu, flows, graph matchings

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Katya and Segments Sets

data structures, interactive, sortings

Valera and Number

bitmasks, dp, math, probabilities

Polo the Penguin and Trees

combinatorics, dfs and similar, trees

Tanks

dp, greedy, implementation

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Lost Root

interactive, probabilities

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

BerDonalds

graphs, math, shortest paths

Superior Periodic Subarrays

number theory

Palindrome XOR

dfs and similar, graphs

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Logical Expression

bitmasks, dp, shortest paths

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Tickets

combinatorics, math, probabilities

Labelling Cities

dfs and similar, graphs, hashing

Liar

binary search, dp, hashing, string suffix structures

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Bear and Contribution

data structures, greedy, sortings, two pointers

Square Table

constructive algorithms, math, probabilities

Two Tanks

binary search, dp, implementation, math

Traveling Graph

bitmasks, graph matchings, graphs

Elevator

dp, graphs, shortest paths

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

The Supersonic Rocket

geometry, hashing, strings

Gotta Go Fast

binary search, dp

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

Apprentice Learning Trajectory

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Numbers

dp, math, number theory

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees

Anniversary

data structures, implementation, math, matrices, number theory

Zublicanes and Mumocrates

dp, trees, two pointers

Minimum Modular

brute force, graphs, math, number theory

New Year and Three Musketeers

data structures, greedy, sortings

One-X

combinatorics, dfs and similar, dp, math, trees

Subsequences Galore

bitmasks, combinatorics, dp

Sleep in Class

constructive algorithms, data structures, math, two pointers

Quarrel

graphs, shortest paths

Encoding

hashing, string suffix structures, strings

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Regular Forestation

hashing, trees

Flow Control

dfs and similar, dp, greedy, trees

Machine Programming

flows, graphs

Lemper Cooking Competition

data structures

Graph Reconstruction

constructive algorithms

Cutlet

data structures, dp

The Last Fight Between Human and AI

math

Sonya and Matrix Beauty

strings

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Vasya and Maximum Matching

dp, trees

Population Size

greedy, implementation, math

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Matrix Problem

flows, graphs

Jee, You See?

bitmasks, combinatorics, dp

Similar Polynomials

combinatorics, math

Splitting the Uniqueness

constructive algorithms

Rest In The Shades

binary search, geometry

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Change-free

greedy

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Maximum Matching

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

Wooden Spoon

combinatorics, dp

Greedy Subsequences

data structures, dp, trees

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Rat Kwesh and Cheese

brute force, constructive algorithms, math

Alice, Bob, Oranges and Apples

number theory

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Deduction Queries

data structures, dsu

Choose a Square

binary search, data structures, sortings

Vasya and Array

dp

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

Maximum Element

combinatorics, dp, math

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Array Equalizer

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

Garlands

data structures

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

MST Company

binary search, graphs

Hongcow Buys a Deck of Cards

bitmasks, brute force, dp

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Frequency Queries

data structures, dfs and similar, trees

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices