Polygon

binary search, dp, geometry

Paint

dp, greedy

A Battle Against a Dragon

*special problem, data structures, dp

Palindromic Hamiltonian Path

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

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Points Movement

data structures, dp, greedy, implementation, sortings

Rescue Niwen!

dp, greedy, string suffix structures, strings

Mocha and Stars

combinatorics, dp, fft, math, number theory

Ezzat and Grid

data structures, dp, greedy

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Equilibrium

data structures, dp, greedy

You

dfs and similar, dp, math, number theory

Stairs

combinatorics, divide and conquer, dp, fft, math

Telepanting

binary search, data structures, dp, sortings

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Stringforces

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

The Three Little Pigs

combinatorics, dp, fft, math

AquaMoon and Potatoes

brute force, data structures, dp

AquaMoon and Time Stop (hard version)

data structures, dp

AquaMoon and Time Stop (easy version)

data structures, dp

Abnormal Permutation Pairs (hard version)

combinatorics, dp, fft, math

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Converging Array (Hard Version)

dp, math

Converging Array (Easy Version)

dp, math

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Game with Cards

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

Gold Transfer

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

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

A New Beginning

data structures, dp, geometry, sortings

Falling Sand (Hard Version)

dfs and similar, dp, graphs, greedy

Turing's Award

data structures, dp

Bingo

bitmasks, combinatorics, dp, math, probabilities

Mashtali and Hagh Trees

combinatorics, dp, trees

Partition Game

binary search, data structures, divide and conquer, dp

Goblins And Gnomes

brute force, dp, flows, graph matchings

Hopping Around the Array

data structures, dp

Favorite Game

bitmasks, dp

Crypto Lights

combinatorics, dp, math, probabilities

Love-Hate

bitmasks, brute force, dp, probabilities

Nastia and a Beautiful Matrix

binary search, constructive algorithms, dp, greedy

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Chests and Keys

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

Fly Around the World

dp, geometry

Reunion

combinatorics, dp, trees

Baby Ehab Plays with Permutations

combinatorics, dp, math

Phoenix and Computers

combinatorics, dp, math

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Chainword

brute force, data structures, dp, matrices, string suffix structures, strings

Hard Optimization

dp

2-Coloring

combinatorics, dp, math

Travelling Salesman Problem

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

Cupboards Jumps

dp

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Chaotic Merge

combinatorics, dp, math, strings

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Square-free division (hard version)

data structures, dp, greedy, math, number theory, two pointers

Genius

bitmasks, dp, graphs, number theory

Squares

constructive algorithms, data structures, dp, graphs, trees

Palindromic Doubles

*special problem, data structures, dp

String Counting

combinatorics, dp, fft, math

Ones

dp, greedy, shortest paths

Pairs of Paths

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

Paired Payment

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

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Move and Swap

dfs and similar, dp, greedy, trees

AB Tree

dp, greedy, trees

Sorting Books

data structures, dp, greedy

School Clubs

dp, fft, math, number theory, probabilities

Lanterns

binary search, data structures, dp

1 2 3 4 ...

dp, math, matrices

Cleaning

data structures, dp, greedy, math

Tiles

combinatorics, dp, fft, math

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

LaIS

data structures, dp, greedy

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Sum of Paths

combinatorics, dp, math

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Max Correct Set

bitmasks, dp, math

Mathematical Expression

constructive algorithms, dp, greedy

XOR-ranges

dp, greedy

Forbidden Value

data structures, dp

String and Operations

dp, greedy

Even Harder

dp

Dog Snacks

binary search, dfs and similar, dp, greedy, trees

Two Editorials

brute force, dp, greedy, sortings, two pointers

Communism

bitmasks, dp, trees

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Rectangular Polyline

constructive algorithms, dp, geometry

Black, White and Grey Tree

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

Sum

data structures, divide and conquer, dp, greedy

INOI Final Contests

combinatorics, dp, fft

Emotional Fishermen

combinatorics, dp, math, two pointers

Make It Increasing

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

Zero-XOR Array

*special problem, dp

Yet Another DAG Problem

bitmasks, dfs and similar, dp, flows, graphs, math

Realistic Gameplay

dp, greedy

Lucky Numbers (Hard Version)

dp, greedy