Magic Numbers

dp

Clear the Multiset

data structures, divide and conquer, dp, greedy

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Discrete Centrifugal Jumps

data structures, dp, graphs

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

Great Vova Wall (Version 1)

greedy, implementation, math

A Simple Task

bitmasks, dp, graphs

Sequence

dp, sortings

Powerful Ksenia

bitmasks, constructive algorithms, math

Kate and imperfection

greedy, implementation, math, number theory, sortings, two pointers

Cleaning

data structures, dp, greedy, math

Magic Stones

constructive algorithms, math, sortings

Almost Difference

data structures, math

Duff in the Army

data structures, trees

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Sum of Paths

combinatorics, dp, math

Palindrome Degree

hashing, strings

Carrots for Rabbits

binary search, data structures, greedy, math, sortings

Non-Decreasing Dilemma

data structures, divide and conquer, math

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Game on Tree

implementation, math, probabilities, trees

GukiZ hates Boxes

binary search, greedy

Three Sequences

constructive algorithms, data structures, greedy, math

Phoenix and Computers

combinatorics, dp, math

Sausage Maximization

bitmasks, data structures, trees

Kaavi and Magic Spell

dp, strings

Make It Increasing

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

Earn or Unlock

bitmasks, brute force, dp

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Almost Acyclic Graph

dfs and similar, graphs

Jongmah

dp

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Calendar Ambiguity

math, number theory

Decreasing Heights

brute force, dp

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Salyg1n and Array (hard version)

constructive algorithms, interactive

Make k Equal

greedy

Perfect Triples

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

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Marbles

bitmasks, dp

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Paint the Middle

dp, greedy, sortings, two pointers

Great Vova Wall (Version 2)

data structures, implementation

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Telepanting

binary search, data structures, dp, sortings

Balanced String

dp

Arithmetic Progression

binary search, interactive, number theory, probabilities

Jon and Orbs

dp, math, probabilities

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

Keyboard Purchase

bitmasks, dp

Sum of Digits

brute force, constructive algorithms, dp, greedy

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Winter is here

combinatorics, dp, math, number theory

Tree Master

brute force, data structures, dfs and similar, trees

Sum of Remainders

implementation, math, number theory

Trips

graphs

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Antenna Coverage

data structures, dp, greedy, sortings

Minimum Possible LCM

brute force, greedy, math, number theory

Three States

dfs and similar, graphs, shortest paths

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Prefixes and Suffixes

constructive algorithms, strings, two pointers

Tricky Function

data structures, divide and conquer, geometry

New Game Plus!

constructive algorithms, greedy, math

Erase Subsequences

dp, strings

Makoto and a Blackboard

dp, math, number theory, probabilities

Nature Reserve

binary search, geometry, ternary search

Tourism

dfs and similar, dp, dsu, graphs, greedy, trees

Priority Queue

combinatorics, dp, implementation, math, ternary search

Vika and Bonuses

binary search, brute force, math, ternary search

Equilibrium

data structures, dp, greedy

Sum Over Zero

data structures, dfs and similar, dp

Madoka and The Best University

math, number theory

Ezzat and Grid

data structures, dp, greedy

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Mr. Kitayuta's Technology

dfs and similar

Happy Line

constructive algorithms, greedy, sortings

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Lexicographically Small Enough

brute force, data structures, greedy, strings

Yet Another Substring Reverse

bitmasks, dp

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Super M

dfs and similar, dp, graphs, trees

Kill Anton

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

Permutation Separation

data structures, divide and conquer

And Reachability

bitmasks, dp

Anonymity Is Important

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

Mike and Frog

brute force, greedy, implementation, math

Delivery Bears

binary search, flows, graphs

K-th Path

brute force, constructive algorithms, shortest paths, sortings

Power Board

brute force, dp, math, number theory

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Andrew and Taxi

binary search, dfs and similar, graphs

Army Creation

binary search, data structures

Minimal Coverage

dp

Find a Number

dp, graphs, number theory, shortest paths