Sasha and the Wedding Binary Search Tree

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

Yet Another Inversions Problem

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

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Partial Sorting

combinatorics, math, number theory

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

Pig and Palindromes

combinatorics, dp

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Mark and Professor Koro

binary search, bitmasks, brute force, combinatorics, data structures, greedy

LCM Sum (easy version)

binary search, brute force, combinatorics, math, number theory, two pointers

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Omkar and Forest

combinatorics, graphs, math, shortest paths

Segment Sum

bitmasks, combinatorics, dp, math

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Another Filling the Grid

combinatorics, dp, math

Anton and School - 2

combinatorics, dp, math, number theory

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Placing Rooks

combinatorics, fft, math

Devu and Flowers

bitmasks, combinatorics, number theory

Olya and Graph

combinatorics, math

Product transformation

combinatorics, math, number theory

Twin Friends

combinatorics, dp

Bath Queue

combinatorics, dp, probabilities

Fancy Stack

combinatorics, dp, implementation

Dima and Horses

combinatorics, constructive algorithms, graphs

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Karen and Test

brute force, combinatorics, constructive algorithms, math

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Memory and Scores

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Equidistant Vertices

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

Pluses everywhere

combinatorics, dp, math, number theory

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Short Colorful Strip

combinatorics, dfs and similar, dp

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

High Cry

binary search, bitmasks, combinatorics, data structures, divide and conquer

Star MST

combinatorics, dp, graph matchings, math

Girl Permutation

combinatorics, dp, math, number theory

Combinatorics Problem

brute force, combinatorics, dp

Playoff Fixing

combinatorics, trees

Mocha and Stars

combinatorics, dp, fft, math, number theory

Priority Queue

combinatorics, dp, implementation, math, ternary search

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Winter is here

combinatorics, dp, math, number theory

Phoenix and Computers

combinatorics, dp, math

Sum of Paths

combinatorics, dp, math

Gerald and Giant Chess

combinatorics, dp, math, number theory

Cowboys

combinatorics, dp, math

White, Black and White Again

combinatorics, number theory

Periodical Numbers

combinatorics, dp, number theory

Count BFS Graph

combinatorics, dp

Blueprint for Seating

combinatorics, divide and conquer, math

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

String Mark

combinatorics, math, strings

Compartments

combinatorics, constructive algorithms, greedy, implementation

Magic Trick

combinatorics, math, probabilities

Devu and Birthday Celebration

combinatorics, dp, math

Happy Sets

combinatorics

Special Matrices

combinatorics, dp

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Light Bulbs (Easy Version)

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

Greg and Friends

combinatorics, dp, graphs, shortest paths

Order book

combinatorics, data structures, greedy

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Key Storage

combinatorics, math

Inverse Coloring

combinatorics, dp, math

Lucky Subsequence

combinatorics, dp, math

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Lengthening Sticks

combinatorics, implementation, math

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Random Task

binary search, bitmasks, combinatorics, dp, math

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Carry Bit

combinatorics, math

Counting Binary Strings

combinatorics, dp, math

Range Deleting

binary search, combinatorics, data structures, two pointers

Colorings and Dominoes

combinatorics, dp, greedy, math

Flexible String Revisit

combinatorics, dp, math, probabilities

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Increase Sequence

combinatorics, dp

Game on Sum (Easy Version)

combinatorics, dp, games, math

Number of Components

combinatorics, data structures, dp, math

Common Number

binary search, combinatorics, dp, math

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Monocarp and the Set

combinatorics, data structures, math

Arena

combinatorics, dp, math

Height All the Same

combinatorics, constructive algorithms, math, matrices

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Playing with Superglue

combinatorics, constructive algorithms

Parquet

combinatorics, constructive algorithms, greedy, implementation

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Bubble Strike

combinatorics, math, probabilities, ternary search