I've Been Flipping Numbers for 300 Years and Calculated the Sum

binary search, brute force, combinatorics, divide and conquer, math, number theory

Goodbye, Banker Life

bitmasks, combinatorics, constructive algorithms, math, number theory

Do You Love Your Hero and His Two-Hit Multi-Target Attacks?

binary search, brute force, constructive algorithms, dp, geometry, greedy, math

For Wizards, the Exam Is Easy, but I Couldn't Handle It

brute force, greedy, implementation

Creating Keys for StORages Has Become My Main Skill

bitmasks, constructive algorithms, greedy

Having Been a Treasurer in the Past, I Help Goblins Deceive

combinatorics, constructive algorithms, strings

New World, New Me, New Array

greedy, implementation, math

Friends and Pizza

Game with Binary String

data structures, divide and conquer, games, greedy

Tree Jumps

combinatorics, dp, trees

Limited Repainting

binary search, greedy

Robot Program

brute force, implementation, math

FizzBuzz Remixed

brute force, math

Graph Inclusion

data structures, dfs and similar, divide and conquer, dsu, graphs

A, B, AB and BA

constructive algorithms, greedy, sortings, strings

Palindrome Shuffle

binary search, greedy, hashing, strings, two pointers

Beautiful Sequence

combinatorics, dp, greedy, two pointers

Set of Strangers

greedy, matrices

Was there an Array?

graph matchings, greedy

Devyatkino

brute force, dfs and similar, greedy, math

Two Large Bags

brute force, dp, greedy, sortings

Adjacent Digit Sums

brute force, constructive algorithms, math

Curse

constructive algorithms, dp, math

Tropical Season

binary search, data structures, greedy, implementation

Club of Young Aircraft Builders (hard version)

combinatorics, dp, math

Club of Young Aircraft Builders (easy version)

combinatorics, dp, math

Bitwise Slides

bitmasks, combinatorics, dp, math

White Magic

constructive algorithms, data structures, dp, greedy, implementation

Object Identification

graphs, greedy, implementation, interactive

Bro Thinks He's Him

combinatorics, data structures, divide and conquer, dp, math, matrices

Skibidus and Capping

combinatorics, math, number theory

Skibidus and Slay

data structures, dfs and similar, graphs, greedy, trees

Skibidus and Rizz

constructive algorithms, greedy, strings

Skibidus and Sigma

greedy, sortings

Skibidus and Fanum Tax (hard version)

binary search, greedy

Skibidus and Fanum Tax (easy version)

binary search, dp, greedy

Skibidus and Ohio

strings

Skibidus and Amog'u

brute force, constructive algorithms, greedy, implementation, strings

We Be Summing

binary search, data structures, dp, two pointers

Mycraft Sand Sort

combinatorics, data structures, dsu, greedy, math, sortings

Eating

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

Remove the Ends

brute force, constructive algorithms, dp, greedy

Variety is Discouraged

binary search, constructive algorithms, greedy, two pointers

Brogramming Contest

greedy, strings

Counting Is Not Fun (Hard Version)

combinatorics, data structures, dfs and similar, dsu, graphs, implementation, trees

Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees

Triangle Tree

data structures, dfs and similar, dp, greedy, trees

Game With Triangles

binary search, brute force, data structures, geometry, greedy, implementation, math, ternary search, two pointers

Remove Exactly Two

brute force, data structures, dfs and similar, dp, graphs, greedy, sortings, trees

Subsequence Update

constructive algorithms, data structures, greedy, sortings

Minimal Coprime

math, number theory

Galaxy Generator

bitmasks, combinatorics, dp

Permutation Factory

flows, geometry, graph matchings, graphs

Traveling Salescat

constructive algorithms, dp, geometry, graphs, greedy, math, sortings

The Game (Hard Version)

data structures, dfs and similar, games, graphs, implementation, trees

The Game (Easy Version)

data structures, dfs and similar, games, graphs, greedy, trees

Balanced Tree

dfs and similar, dp, graphs, greedy, trees

Cirno and Operations

brute force, math

Clockwork

greedy, math

String

constructive algorithms, greedy, math, strings

Kevin and Nivek

divide and conquer, dp

Kevin and Stones (Hard Version)

flows, graphs

Kevin and Stones (Easy Version)

flows, graph matchings, graphs

Kevin and Teams

constructive algorithms, graphs, interactive

Kevin and Binary String (Hard Version)

data structures, dp

Kevin and Binary String (Easy Version)

greedy, implementation

Kevin and And

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

Kevin and Numbers

bitmasks, data structures

Kevin and Puzzle

2-sat, combinatorics, dp

Kevin and Geometry

binary search, geometry

Kevin and Arithmetic

math

Bugged Sort

dp, greedy, sortings

Multiplicative Arrays

combinatorics, dp, number theory

Graph Composition

dfs and similar, dsu, graphs, greedy

Subtract Min Sort

greedy

Game of Mathletes

games, greedy, sortings, two pointers

Farmer John's Card Game

greedy, sortings

Fibonacciness

brute force

Stop Gaming (Hard Version)

brute force, constructive algorithms, data structures, hashing, strings

Stop Gaming (Easy Version)

brute force, constructive algorithms, greedy, hashing, strings

Graph and Graph

data structures, graphs, greedy, shortest paths

Customer Service

brute force, constructive algorithms, graph matchings, greedy, math, sortings

Cost of the Array

brute force, constructive algorithms, greedy, math

Milya and Two Arrays

constructive algorithms, greedy, sortings

Coffee Break

data structures, greedy, math

Secret Message

constructive algorithms, dfs and similar, math

Formation

binary search, data structures, dp, sortings, two pointers

Another Exercise on Graphs (hard version)

binary search, dfs and similar, dp, dsu, graphs, shortest paths, sortings

Another Exercise on Graphs (Easy Version)

binary search, brute force, dp, dsu, graphs, shortest paths, sortings

Gifts Order

data structures, greedy, implementation, math, matrices

Trip to the Olympiad

bitmasks, constructive algorithms, greedy, math

Gorilla and the Exam

greedy, sortings

MEX Table

constructive algorithms, math

Xor of Median (Hard Version)

bitmasks, brute force, combinatorics, dp, math

Xor of Median (Easy Version)

bitmasks, brute force, combinatorics, dp, math

Nested Segments

combinatorics, dfs and similar, dp, dsu, math

Unique Median

binary search, brute force, combinatorics, data structures, divide and conquer, dp

Palindromic Subsequences

brute force, constructive algorithms, math

Find the Permutation

brute force, dfs and similar, graphs, implementation, sortings

Shape Perimeter

constructive algorithms, math