Interval Game

bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities

EXPloration, EXPloitation, and Gain Some EXPerience!

bitmasks, brute force, dp, greedy, implementation

Beautiful Numbers

bitmasks, dp, fft, greedy, math

Fuzzy Concatenation (Hard version)

binary search, bitmasks, data structures, dp, greedy, string suffix structures

Again Trees... (hard version)

bitmasks, data structures, dfs and similar, dp, fft, trees

Again Trees... (Easy Version)

bitmasks, dfs and similar, dp, trees

Secret message

bitmasks, brute force, dp, math, number theory

Xor Product

bitmasks, dp

Cool Problem

bitmasks, dp, math

Shortest Statement Ever

bitmasks, constructive algorithms, dp, greedy

Christmas Reindeer (easy version)

bitmasks, brute force, combinatorics, dp, math

No Effect XOR

bitmasks, divide and conquer, dp, greedy, math

XOR-factorization

bitmasks, constructive algorithms, dp, greedy, number theory

Blackslex and Plants

bitmasks, data structures, dp, implementation, math

Numbers or Fireworks

bitmasks, combinatorics, dp, graphs

deCH OR Dations

bitmasks, data structures, dp, hashing, probabilities

Omega Numbers

bitmasks, combinatorics, dp, math, number theory

Taiga's Carry Chains

bitmasks, brute force, dp, greedy, math

Build XOR on a Segment

bitmasks, dp

Isaac's Queries

bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities

Prime Gaming (Hard Version)

bitmasks, combinatorics, dp, probabilities

Prime Gaming (Easy Version)

bitmasks, combinatorics, dp

Maple and Tree Beauty (Hard Version)

bitmasks, brute force, dfs and similar, dp, fft, trees

Wafu!

bitmasks, brute force, data structures, dfs and similar, dp, math

Interactive RBS (Hard Version)

binary search, bitmasks, constructive algorithms, dp, interactive

And Constraint

bitmasks, dp, greedy

Gellyfish and Forget-Me-Not

bitmasks, dp, games, greedy, math

Maximize Nor

bitmasks, data structures, dp, implementation, sortings

Wonderful XOR Problem

bitmasks, combinatorics, dp, fft, math

Zebra-like Numbers

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy, math

Serval and The Formula

bitmasks, constructive algorithms, dp, greedy

Math Division

bitmasks, dp, math, probabilities

AND x OR

bitmasks, constructive algorithms, dp

XOR Matrix

bitmasks, combinatorics, dp, implementation, math

Equalization

bitmasks, brute force, dp, graphs, math

Infinite Sequence (Hard Version)

bitmasks, brute force, constructive algorithms, data structures, dp, implementation, math

Infinite Sequence (Easy Version)

bitmasks, brute force, dp, implementation, math

Friends and Pizza

bitmasks, divide and conquer, dp, fft

Bitwise Slides

bitmasks, combinatorics, dp, math

Eating

binary search, bitmasks, brute force, data structures, dp, greedy, trees, two pointers

Galaxy Generator

bitmasks, combinatorics, dp

Kevin and And

bitmasks, brute force, dp, greedy, math, sortings

Xor of Median (Hard Version)

bitmasks, brute force, combinatorics, dp, math

Xor of Median (Easy Version)

bitmasks, brute force, combinatorics, dp, math

Bewitching Stargazer

bitmasks, divide and conquer, dp, math

Snakes

bitmasks, dp, dsu, graphs

Nim

bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths

Cube

bitmasks, dfs and similar, dp

Divide OR Conquer

binary search, bitmasks, data structures, dp, implementation

Natlan Exploring

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

XORificator 3000

bitmasks, dp, number theory, two pointers

Message Spread

bitmasks, brute force, combinatorics, dp

Alice's Adventures in Addition

bitmasks, brute force, dp, implementation

Bit Game (Hard Version)

bitmasks, dp, math

Expected Power

bitmasks, dp, math, probabilities

Cases

bitmasks, brute force, dp, strings

Minecraft

bitmasks, brute force, dp, graphs, math

Xor-Grid Problem

bitmasks, constructive algorithms, dp, implementation

Prime Split Game

bitmasks, dp, fft, games, math, number theory

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

Your Loss

bitmasks, brute force, dp, trees

Number of k-good subarrays

bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Fenwick Tree

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

A BIT of an Inequality

bitmasks, brute force, dp, math

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

Shuffling Songs

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

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

Construct Tree

bitmasks, constructive algorithms, dp, trees

Kim's Quest

bitmasks, combinatorics, dp

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Small GCD

bitmasks, brute force, dp, math, number theory

I Wanna be the Team Leader

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

Tree XOR

bitmasks, dfs and similar, dp, greedy, trees

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

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

Candy Party (Hard Version)

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

Divide, XOR, and Conquer

bitmasks, dp, math

Magic Will Save the World

binary search, bitmasks, brute force, dp

PermuTree (hard version)

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

Earn or Unlock

bitmasks, brute force, dp

Vika and Wiki

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

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Don't Blame Me

bitmasks, combinatorics, dp, math

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

Code Lock

bitmasks, dp

Routing

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