Permutation Problem (Hard Version)

brute force, data structures, hashing, math, number theory

Reconstruction

brute force, dp, math

Splittable Permutations

combinatorics, data structures, dfs and similar, greedy, math, trees

Cat, Fox and Swaps

graphs, math, sortings

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Inversion Composition

constructive algorithms, data structures, greedy

Rare Coins

combinatorics, math, probabilities

Nobody is needed

2-sat, data structures, dfs and similar, dp

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Replace on Segment

dp, graph matchings

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

Construct Tree

bitmasks, constructive algorithms, dp, trees

Construct Matrix

constructive algorithms, math

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Palindromic Parentheses

constructive algorithms

Deck-Building Game

divide and conquer, math

Tree Queries

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

Babysitting

2-sat, binary search, data structures, graphs, trees

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Maximum Monogonosity

brute force, dp, math

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Expected Destruction

combinatorics, dp, math, probabilities

The Boss's Identity

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

Boxes and Balls

dp, implementation, math

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Count Supersequences

combinatorics, dp, math

Lottery

binary search, brute force, greedy, math, two pointers

Typewriter

brute force, math

LuoTianyi and XOR-Tree

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

Removing Graph

brute force, dp, games, graphs, math

Balancing Weapons

binary search, brute force, data structures, math, two pointers

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

DSU Master

combinatorics, dp, dsu, math

Gifts from Grandfather Ahmed

dp, math, number theory

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Serval and Music Game

brute force, dp, implementation, math, number theory

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Inverse Transformation

constructive algorithms, implementation, math

Double Sort II

dfs and similar, flows, graph matchings, graphs

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Italian Data Centers

graphs, shortest paths

Spinach Pizza

games, geometry, greedy, interactive

Library game

games, greedy, interactive, sortings

Laboratory on Pluto

constructive algorithms, dp, greedy, math

Interactive Factorial Guessing

brute force, games, implementation, interactive

Hossam and Range Minimum Query

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

Hossam and a Letter

brute force, dp, implementation, two pointers

Algebra Flash

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

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

Joking (Easy Version)

binary search, constructive algorithms, interactive, ternary search

Ela Goes Hiking

combinatorics, dp, math, probabilities

Zeros and Ones

bitmasks, divide and conquer, dp, math

Function Sum

brute force, combinatorics, dp, fft, math

Kingdom of Criticism

data structures, dsu

Journey

dp, trees

Electrical Efficiency

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

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Bags with Balls

combinatorics, dp, math, number theory

Swap and Maximum Block

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

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

XOR Triangle

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

Multiset of Strings

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

Points

combinatorics, data structures, implementation, math, matrices

Text Editor

brute force, dp, greedy, strings

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

ANDfinity

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

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Tokitsukaze and Permutations

dp, math

Power or XOR?

bitmasks, combinatorics, math, number theory

Even Split

binary search, constructive algorithms, greedy, math

MinimizOR

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

Narrow Components

brute force, data structures, dp, dsu, math, trees

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Towers

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

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Middle Duplication

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

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Robot and Candies

data structures, graph matchings, greedy

Poachers

dp, games, graphs, trees

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Coloring

combinatorics, constructive algorithms, implementation, math

Xor of 3

brute force, constructive algorithms, greedy, two pointers

A Battle Against a Dragon

*special problem, data structures, dp

Rescue Niwen!

dp, greedy, string suffix structures, strings

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Stringforces

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

The Three Little Pigs

combinatorics, dp, fft, math

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths