Paths on a Grid

data structures, dp, hashing

Build a Tree

constructive algorithms, trees, two pointers

XOR Sorting (Hard Version)

bitmasks, data structures, greedy

XOR Sorting (Easy Version)

bitmasks, greedy

Inversion of a Subsequence

greedy, math

Yet Another Constructive

constructive algorithms

Zero Sum

constructive algorithms, dp, number theory

Whoname and Unsorted Array

constructive algorithms

lce4113 and Security Game

bitmasks, interactive, interactive, math, probabilities

diss_quack and Array Game

bitmasks, brute force, games, greedy

0mar and Alternating Sums

combinatorics, dp, math

ezraft and Array

constructive algorithms, number theory

farmpiggie and Subset Sum

constructive algorithms

Connect Connect See

brute force, brute force, data structures

NPC Challenge

divide and conquer, interactive

Familiar?

brute force, combinatorics, dp

Tom and Jerry

dfs and similar, dsu, games, trees

Construct an Array (Hard Version)

2-sat, constructive algorithms, dfs and similar, graphs, implementation

Construct an Array (Easy Version)

dfs and similar, implementation, sortings

MEXOR

bitmasks, constructive algorithms, math

Delete and Concatenate

greedy

Who Watches the Watchpig?

greedy

Yura and Deadlines

data structures, dp

Anya Loves Trees!

dfs and similar, dp, greedy, trees, trees

Masha and the Garland

data structures, dp, greedy, implementation, math, number theory, strings

Yaroslav and Productivity

constructive algorithms, dp, greedy, math, number theory

Stepan and Permutation

constructive algorithms, dfs and similar, dsu, greedy, math, number theory, sortings, sortings, sortings

Nikita and Books

greedy, greedy, math, math, sortings, sortings

Iskander and Drawings

dp, games, greedy, strings

Summer Vacation

data structures, data structures, data structures, dp, dp, probabilities, trees

Product of Closures

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

Two Digit Strings

dp, strings

Unstable Elements

brute force, brute force, data structures, implementation, sortings, two pointers, two pointers

Predominant Frequency Division

data structures, greedy, implementation, math

Bigrams

sortings, strings

Summmon

binary search, data structures, greedy, implementation, math, number theory

A Bit Odd

data structures, games, greedy, math

Fair and Square

combinatorics, dp, graphs, math, number theory, trees

An Alternative Way

dp, greedy, math

RemovevomeR

greedy

Good times Good times

constructive algorithms, dfs and similar, math

Divide and Conquer

greedy, math, number theory

AI Finds Nothing Here

combinatorics, math

Another Popcount Problem

greedy

Colorful Works

dp, fft, games, implementation

The end of this world,

data structures, divide and conquer, dsu, graphs

Hunting the Beast

combinatorics, dp, graphs, math

Revival

binary search, data structures, math, two pointers

Decidophobia

greedy, math, sortings, two pointers

Nim Game Is XOR Game

constructive algorithms, games, greedy, math

Infinite Work

combinatorics, graphs, greedy, math, trees

Cake Trial

dp, greedy

Storming Arasaka

greedy, math, number theory

Village Guilds

dfs and similar, dp, trees

Crimson Triples

dp, math, number theory

Another Puzzle from Papyrus

greedy, math, sortings

DBFS Order (Hard Version)

dp, trees

DBFS Order (Easy Version)

dp, trees

Slime and Queries

data structures, greedy, trees

Send GCDs

communication, constructive algorithms, interactive, math, number theory

Paint the Array

data structures, dp, greedy

Permutation Commutation

data structures, graphs, greedy

Fullmetal Bitchemist

constructive algorithms, greedy, math

Duck Surplus

binary search, greedy

Annoying the Ghost

brute force, greedy

Destroying Towers

games, greedy, schedules

Criterion in Burlandia

binary search, bitmasks, brute force, brute force, data structures, data structures, dfs and similar, divide and conquer, implementation, trees, two pointers

Elections in Saransk (hard version)

combinatorics, dp, dp, dp, math, number theory

Elections in Saransk (easy version)

number theory

Friendly Gifts

brute force, dp

Brand New Tatar TV Show

binary search, constructive algorithms, dp, games, games, math

Omsk Programmers

brute force, greedy, greedy, math, math

Tatar TV Show

greedy, math, strings

Games on the Train

greedy, math

Stripe, Token and Two Players

data structures, dp, games

Vessels, Heights and Two Versions (Hard Version)

data structures, dfs and similar, dsu, greedy, implementation, two pointers

Vlad, Misha and Two Arrays

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

XOR, Expression and Two Binary Numbers

bitmasks, divide and conquer, dp, math, number theory

Vessels, Heights and Two Versions (Easy Version)

dfs and similar, dsu, greedy, implementation, two pointers

Palindrome, Twelve and Two Terms

brute force, constructive algorithms, math

Euclid, Sequence and Two Numbers

math, number theory, sortings

Shortest GCD Paths

dp, graphs, math, number theory, shortest paths, shortest paths

Permutation Transmission (Difficult Version)

bitmasks, combinatorics, sortings

Permutation Transmission (Easy Version)

bitmasks, combinatorics, sortings

Goods on the Shelf

brute force, data structures, implementation, two pointers

Cost of a Bracket Sequence

brute force, dp, greedy

Different Distances

constructive algorithms

AI Project Development

brute force, math

The Cake Is a Lie

greedy, math, number theory, number theory

Snaking Arrangement

combinatorics, combinatorics, combinatorics, constructive algorithms

Magical Tiered Cake

constructive algorithms, constructive algorithms, dfs and similar, dp, greedy

Seating Arrangement (Hard Version)

binary search, binary search, binary search, greedy, greedy, greedy, math, two pointers

Seating Arrangement (Easy Version)

binary search, binary search, dp, greedy, greedy, two pointers, two pointers

Cake Leveling

binary search, greedy, math

Convergence

greedy, sortings, sortings, sortings

Quadratic Jumps

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

Graph Cutting

dfs and similar, dp, math, trees

Maximum Prefix Sums

constructive algorithms, greedy, implementation, two pointers

Chipmunk Theo and Equality

implementation, sortings

Another Sorting Problem

constructive algorithms