Reverse and Swap

binary search, bitmasks, data structures

Sasha and the Happy Tree Cutting

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

Second price auction

bitmasks, probabilities

Permutation Sum

bitmasks, combinatorics, dp, implementation, meet-in-the-middle

Vlad and Avoiding X

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

Walk the Runway

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

Genius

bitmasks, dp, graphs, number theory

New Year Letter

bitmasks, brute force, dp

Careful Maneuvering

bitmasks, brute force, geometry

Vladik and cards

binary search, bitmasks, brute force, dp

Sum Balance

bitmasks, dfs and similar, dp, graphs

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Vika and Wiki

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

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

Kirill and Company

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

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Table

bitmasks, combinatorics, dp, math

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Three Chairs

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

Arpa and a game with Mojtaba

bitmasks, dp, games

Routing

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

Remembering Strings

bitmasks, dp

Axis Walking

bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle

I Wanna be the Team Leader

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

RBS

binary search, bitmasks, brute force, data structures, dp

PermuTree (hard version)

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

Fenwick Tree

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

Memory for Arrays

binary search, bitmasks, greedy

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Sereja and Table

bitmasks, greedy

LRU

bitmasks, dp, math, probabilities

Anton and School

bitmasks, constructive algorithms, implementation, math

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math

PolandBall and Gifts

bitmasks, dp, greedy

Felicity's Big Secret Revealed

bitmasks, dp

Petya and Spiders

bitmasks, dp, dsu

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Multiple Lamps

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

Continuous City

bitmasks, constructive algorithms

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

XOR Break --- Game Version

bitmasks, games, greedy, interactive

Party

bitmasks, brute force, dp, graphs

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Cleaning Robot

bitmasks, dp

Happy New Year

bitmasks, dp, implementation

ANDfinity

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

X-OR

bitmasks, constructive algorithms, divide and conquer, interactive, probabilities

Captains Mode

bitmasks, dp, games

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

wxhtzdy ORO Tree

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

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Jellyfish and Math

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

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

XOR Counting

bitmasks, combinatorics, dp, math

The Most Reckless Defense

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

Divide, XOR, and Conquer

bitmasks, dp, math

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Axel and Marston in Bitland

bitmasks, dp, graphs, matrices

Hongcow Buys a Deck of Cards

bitmasks, brute force, dp

Xor-matic Number of the Graph

bitmasks, graphs, math, number theory, trees

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Foo Fighters

bitmasks, constructive algorithms

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Maximum Matching

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

Password

bitmasks, dp, shortest paths

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Field Photography

bitmasks, data structures, sortings

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

Inna and Binary Logic

binary search, bitmasks, data structures

Jee, You See?

bitmasks, combinatorics, dp

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

Snake

bitmasks, dfs and similar, graphs, implementation

Dead Ends

bitmasks, dp

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Construct Tree

bitmasks, constructive algorithms, dp, trees

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Huge Strings

bitmasks, brute force, dp, implementation, strings

Turtle Magic: Royal Turtle Shell Pattern

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

Game with Strings

bitmasks, dp, probabilities

Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Subsequences Galore

bitmasks, combinatorics, dp

The Boss's Identity

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

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Strange LCS

bitmasks, dp, graphs, greedy, strings

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees