Alex and Julian

bitmasks, math, number theory

Moving Chips

bitmasks, dp, greedy

Shuffling Songs

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

PFAST Inc.

bitmasks, brute force, graphs

Tree Diameter

bitmasks, graphs, interactive

Team Building

bitmasks, dp, greedy, sortings

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Xor Tree

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

Sausage Maximization

bitmasks, data structures, trees

Earn or Unlock

bitmasks, brute force, dp

The Wu

bitmasks, brute force, data structures

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Nene and the Mex Operator

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

Devu and Flowers

bitmasks, combinatorics, number theory

Looking for Order

bitmasks, dp

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Score of a Tree

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

Bookshelves

bitmasks, dp, greedy

...And after happily lived ever they

*special problem, bitmasks

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Coprime Subsequences

bitmasks, combinatorics, number theory

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Vasya and Good Sequences

bitmasks, dp

Marbles

bitmasks, dp

Paths in a Complete Binary Tree

bitmasks, trees

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

The LCMs Must be Large

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

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Keyboard Purchase

bitmasks, dp

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Choosing The Commander

bitmasks, data structures, trees

ConstructOR

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

Game of Stones

bitmasks, dp, games

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Permutations

bitmasks, divide and conquer, math

Guess Game

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

Sheikh (Hard Version)

binary search, bitmasks, brute force, greedy, implementation, two pointers

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

388535 (Hard Version)

bitmasks, brute force, data structures, math

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

Segment Sum

bitmasks, combinatorics, dp, math

Sum over all Substrings (Hard Version)

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

Cunning Gena

bitmasks, dp, greedy, sortings

Yet Another Substring Reverse

bitmasks, dp

And Reachability

bitmasks, dp

Candy Party (Hard Version)

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

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Another MEX Problem

bitmasks, brute force, dp, shortest paths

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

AND Graph

bitmasks, dfs and similar, dsu, graphs

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Random Task

binary search, bitmasks, combinatorics, dp, math

Borya and Hanabi

bitmasks, brute force, implementation

Love-Hate

bitmasks, brute force, dp, probabilities

Fuzzy Search

bitmasks, brute force, fft

Kim's Quest

bitmasks, combinatorics, dp

Addition on Segments

bitmasks, data structures, divide and conquer, dp

High Cry

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

Mark and Professor Koro

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

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Make Them Similar

bitmasks, brute force, hashing, meet-in-the-middle

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Open Communication

bitmasks, brute force

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Another Sith Tournament

bitmasks, dp, math, probabilities

William The Oblivious

bitmasks, data structures, dp, matrices

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

A Bit Similar

bitmasks, brute force, hashing, string suffix structures, strings, two pointers

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Math Test

bitmasks, brute force, greedy

Multidimensional Queries

bitmasks, data structures

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Two Pizzas

bitmasks, brute force

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Hongcow's Game

bitmasks, divide and conquer, interactive

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

List Of Integers

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

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Network Mask

*special problem, bitmasks, brute force, implementation

Salazar Slytherin's Locket

bitmasks, dp

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Helping Hiasat

bitmasks, brute force, dp, meet-in-the-middle

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Poman Numbers

bitmasks, greedy, math, strings

Bored Bakry

bitmasks, greedy, math, two pointers