Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Sasha and a Walk in the City

combinatorics, dp, math, trees

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Sasha and the Drawing

constructive algorithms, greedy, math

Sasha and the Beautiful Array

constructive algorithms, greedy, math, sortings

Digital Patterns

combinatorics, data structures, implementation, math

Modular Sequence

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

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Physical Education Lesson

brute force, math, number theory

Rectangle Cutting

geometry, math

Paint Charges

data structures, dp, greedy, math

Klever Permutation

constructive algorithms, math, two pointers

Choose the Different Ones!

brute force, greedy, math

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Good Trip

combinatorics, dp, math, probabilities

A Balanced Problemset?

brute force, greedy, math, number theory

Balanced Subsequences

combinatorics, dp, math

Fractal Origami

geometry, math, matrices

Space Harbour

data structures, implementation, math, sortings

Increasing Subsequences

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

Berserk Monsters

brute force, data structures, dsu, implementation, math

Closest Cities

greedy, implementation, math

Forming Triangles

combinatorics, constructive algorithms, math, sortings

Sum of Progression

brute force, data structures, dp, implementation, math

Eat the Chip

brute force, games, greedy, math

Sending Messages

greedy, math

Square

greedy, math

Counting Binary Strings

combinatorics, dp, math

Array Repetition

binary search, brute force, dsu, implementation, math

Partitioning the Array

brute force, math, number theory

Summation Game

games, greedy, math, sortings

Satisfying Constraints

brute force, greedy, math

Counting Prefixes

combinatorics, constructive algorithms, dp, implementation, math

Wallet Exchange

games, math

Permutation of Given

constructive algorithms, math

XOR-distance

bitmasks, greedy, implementation, math

Brick Wall

constructive algorithms, greedy, implementation, math

Construct Matrix

constructive algorithms, math

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Watering an Array

brute force, greedy, implementation, math

Least Product

constructive algorithms, math

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Mathematical Problem

brute force, constructive algorithms, geometry, math

Training Before the Olympiad

constructive algorithms, games, greedy, implementation, math

Two Divisors

constructive algorithms, math, number theory

2023

constructive algorithms, implementation, math, number theory

Romantic Glasses

data structures, greedy, math

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Quests

greedy, math

Preparing for the Contest

constructive algorithms, math

Innovative Washing Machine

geometry, math, two pointers

Fugitive Frenzy

math, probabilities

Evaluate It and Back Again

constructive algorithms, implementation, math

Divisibility Test

math

Blueprint for Seating

combinatorics, divide and conquer, math

Short Permutation Problem

combinatorics, dp, fft, math

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Multiple Lamps

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

Split Plus K

greedy, math, number theory

Heavy Intervals

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

Make Almost Equal With Mod

bitmasks, constructive algorithms, math, number theory

Distinct Buttons

implementation, math

Removal of Unattractive Pairs

constructive algorithms, greedy, math, strings

Triangle Construction

greedy, math

Deck-Building Game

divide and conquer, math

One-X

combinatorics, dfs and similar, dp, math, trees

Cyclic MEX

data structures, implementation, math, two pointers

Constructive Problems

constructive algorithms, math

Geo Game

greedy, interactive, math

Trees and XOR Queries Again

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

Insert and Equalize

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

Yet Another Monster Fight

binary search, dp, greedy, implementation, math

Add, Divide and Floor

constructive algorithms, greedy, math

Chip and Ribbon

greedy, math

Line Trip

greedy, math

Small GCD

bitmasks, brute force, dp, math, number theory

Laura and Operations

dp, math

Yarik and Musical Notes

hashing, math, number theory

Game with Integers

games, math, number theory

Absolute Beauty

greedy, math

Milena and Admirer

greedy, math

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Bracket Xoring

constructive algorithms, greedy, implementation, math

Ones and Twos

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

Fancy Arrays

combinatorics, dp, math, matrices

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Points and Minimum Distance

greedy, math, sortings

Treasure Chest

math

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Suspicious logarithms

binary search, brute force, math

Deja Vu

brute force, math, sortings

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Split

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

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Monocarp and the Set

combinatorics, data structures, math