Cat, Fox and the Lonely Array

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

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

A BIT of an Inequality

bitmasks, brute force, dp, math

A BIT of a Construction

bitmasks, constructive algorithms, greedy, implementation

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

Dark Matter

bitmasks, geometry

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Equal XOR

bitmasks, constructive algorithms

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

XOR Break --- Game Version

bitmasks, games, greedy, interactive

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Maximize the Difference

bitmasks, brute force, dfs and similar

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Sasha and the Happy Tree Cutting

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

Vlad and Avoiding X

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

Vlad and an Odd Ordering

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

Vlad and Division

bitmasks, greedy

Increasing Subsequences

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

XOR-distance

bitmasks, greedy, implementation, math

Construct Tree

bitmasks, constructive algorithms, dp, trees

Not Quite Latin Square

bitmasks, brute force, implementation

Odd One Out

bitmasks, implementation

Game with Multiset

binary search, bitmasks, brute force, greedy

Kim's Quest

bitmasks, combinatorics, dp

Multiple Lamps

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

Make Almost Equal With Mod

bitmasks, constructive algorithms, math, number theory

Button Pressing

bitmasks, constructive algorithms, hashing

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

StORage room

bitmasks, brute force, constructive algorithms, greedy

Small GCD

bitmasks, brute force, dp, math, number theory

XOR Construction

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

I Wanna be the Team Leader

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

Look Back

bitmasks, greedy

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Iva & Pav

binary search, bitmasks, data structures, greedy

Jellyfish and Green Apple

bitmasks, greedy, math, number theory

Jellyfish and Math

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

Data Structures Fan

binary search, bitmasks, data structures, dp

Another MEX Problem

bitmasks, brute force, dp, shortest paths

Friendly Arrays

bitmasks, greedy, math

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Candy Party (Easy Version)

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

XOR Palindromes

bitmasks, constructive algorithms, strings

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Divisor Chain

bitmasks, constructive algorithms, math, number theory

Divide, XOR, and Conquer

bitmasks, dp, math

Magic Will Save the World

binary search, bitmasks, brute force, dp

Four Suits

binary search, bitmasks, flows, greedy

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Earn or Unlock

bitmasks, brute force, dp

Lisa and the Martians

bitmasks, greedy, math, strings, trees

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Hamon Odyssey

bitmasks, greedy, two pointers

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Sum in Binary Tree

bitmasks, combinatorics, math, trees

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and Books

bitmasks, greedy, math

Binary Cafe

bitmasks, combinatorics, math

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Don't Blame Me

bitmasks, combinatorics, dp, math

Mr. Perfectly Fine

bitmasks, greedy, implementation

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

XOR Counting

bitmasks, combinatorics, dp, math

Subsequence Addition (Hard Version)

bitmasks, dp, greedy, implementation, sortings

We Need the Zero

bitmasks, brute force

Code Lock

bitmasks, dp

Routing

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

The Very Beautiful Blanket

bitmasks, constructive algorithms

Dasha and Nightmares

bitmasks, hashing, meet-in-the-middle, strings

Tree Cutting

bitmasks, dfs and similar, dp

Removal Sequences

bitmasks, dfs and similar, graphs

Fixed Prefix Permutations

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

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Flexible String

bitmasks, brute force, strings