Kuroni and the Punishment

math, number theory, probabilities

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Kuroni and Simple Strings

constructive algorithms, greedy, strings, two pointers

Kuroni and the Gifts

brute force, constructive algorithms, greedy, sortings

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

Air Conditioner

dp, greedy, implementation, sortings, two pointers

Longest Palindrome

brute force, constructive algorithms, greedy, implementation, strings

Two Rabbits

math

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Number of Components

dsu, implementation

Erase Subsequences

dp, strings

Fill The Bag

bitmasks, greedy

Perfect Keyboard

dfs and similar, greedy, implementation

National Project

math

Erasing Zeroes

implementation, strings

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Nanosoft

binary search, data structures, dp, implementation

Time to Run

constructive algorithms, graphs, implementation

Ayoub's function

binary search, combinatorics, greedy, math, strings

Motarack's Birthday

binary search, greedy, ternary search

Three Strings

implementation, strings

Assigning to Classes

greedy, implementation, sortings

Non-zero

implementation, math

So Mean

interactive, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Water Balance

data structures, geometry, greedy

Aerodynamic

geometry

Anu Has a Function

brute force, greedy, math

Berland Beauty

constructive algorithms, dfs and similar, greedy, sortings, trees

String Coloring (hard version)

data structures, dp

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Fight with Monsters

greedy, sortings

Yet Another Walking Robot

data structures, implementation

Food Buying

math

Array with Odd Sum

math

Good Contest

combinatorics, dp, probabilities

Permutation Separation

data structures, divide and conquer

Same GCDs

math, number theory

Obtain The String

dp, greedy, strings

Infinite Prefixes

math, strings

Display The Number

greedy

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Obtain a Permutation

greedy, implementation, math

MEX maximizing

data structures, greedy, implementation, math

Product of Three Numbers

greedy, math, number theory

Collecting Packages

implementation, sortings

Collecting Coins

math

JOE is on TV!

combinatorics, greedy, math

ConneR and the A.R.C. Markland-N

binary search, brute force, implementation

Nora's Toy Boxes

bitmasks, combinatorics, dp

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Aroma's Search

brute force, constructive algorithms, geometry, greedy, implementation

NEKO's Maze Game

data structures, dsu, implementation

Coffee Varieties (easy version)

graphs, interactive

Array Sharpening

greedy, implementation

Even But Not Even

greedy, math, strings

Making Shapes

dp

Cartesian Tree

data structures

Coffee Varieties (hard version)

constructive algorithms, graphs, interactive

Prefix Enlightenment

dfs and similar, dsu, graphs

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Mind Control

brute force, data structures, implementation

Red-Blue Graph

constructive algorithms, flows

Messenger Simulator

data structures

Minimax Problem

binary search, bitmasks, dp

Two Arrays

combinatorics, dp

Yet Another Meme Problem

math

Deadline

binary search, brute force, math, ternary search

Hyperset

brute force, data structures, implementation

Angry Students

greedy, implementation

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Fedya the Potter Strikes Back

data structures, strings

LCC

data structures, math, matrices, probabilities

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Madhouse (Easy version)

brute force, constructive algorithms, interactive, math

Numbers on Tree

constructive algorithms, data structures, dfs and similar, graphs, greedy, trees

Garland

dp, greedy, sortings

Classical?

binary search, combinatorics, number theory

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Fadi and LCM

brute force, math, number theory

Just Eat It!

dp, greedy, implementation

Mezo Playing Zoma

math

Seollal

graphs

New Year and Social Network

data structures, graph matchings, graphs, math, trees

New Year and Castle Construction

combinatorics, geometry, math, sortings

New Year and Conference

binary search, data structures, hashing, sortings

New Year and Permutation

combinatorics, math

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

New Year and Naming

implementation, strings

DIY Garland

constructive algorithms, greedy, trees

New Year Parties

dp, greedy

Christmas Trees

graphs, greedy, shortest paths