Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Almost Triple Deletions

data structures, dp, greedy

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Tree Queries (Hard Version)

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

Tree Queries (Easy Version)

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

Unique Occurrences

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

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

Sorting Pancakes

dp

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Jee, You See?

bitmasks, combinatorics, dp

Optimal Partition

data structures, dp

Job Lookup

constructive algorithms, dp, shortest paths, trees

Fancy Stack

combinatorics, dp, implementation

Star MST

combinatorics, dp, graph matchings, math

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Vitaly and Advanced Useless Algorithms

dp, greedy, implementation

Power Board

brute force, dp, math, number theory

Flipping Range

constructive algorithms, dp, greedy, number theory

Paint the Middle

dp, greedy, sortings, two pointers

Game on Sum (Hard Version)

combinatorics, dp, games, math

Game on Sum (Easy Version)

combinatorics, dp, games, math

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

New School

binary search, data structures, dp, greedy, implementation, sortings

Subsequences Galore

bitmasks, combinatorics, dp

Divan and Kostomuksha (hard version)

dp, number theory

Divan and Kostomuksha (easy version)

dp, number theory

William The Oblivious

bitmasks, data structures, dp, matrices

Arena

combinatorics, dp, math

Extreme Extension

dp, greedy, math, number theory

Optimal Insertion

data structures, divide and conquer, dp, greedy, sortings

RBS

binary search, bitmasks, brute force, data structures, dp

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Rubik's Cube Coloring (hard version)

brute force, dp, implementation, math, trees

Changing Brackets

constructive algorithms, data structures, dp, greedy

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Non-equal Neighbours

combinatorics, dp, math

Korney Korneevich and XOR (hard version)

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

Minimal Coverage

dp

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Holiday Wall Ornaments

dp, strings

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Mocha and Stars

combinatorics, dp, fft, math, number theory

Ezzat and Grid

data structures, dp, greedy

Equilibrium

data structures, dp, greedy

Telepanting

binary search, data structures, dp, sortings

Equidistant Vertices

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

How Many Paths?

dfs and similar, dp, graphs, trees

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Tree Array

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

Gold Transfer

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

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Love-Hate

bitmasks, brute force, dp, probabilities

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Phoenix and Computers

combinatorics, dp, math

Colorings and Dominoes

combinatorics, dp, greedy, math

Digits

dp, math, number theory

Travelling Salesman Problem

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

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Chaotic Merge

combinatorics, dp, math, strings

The Number of Pairs

dp, math, number theory

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Palindromic Doubles

*special problem, data structures, dp

Paired Payment

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

Max Median

binary search, data structures, dp

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Skyline Photo

data structures, divide and conquer, dp

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Cleaning

data structures, dp, greedy, math

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

LaIS

data structures, dp, greedy

Sum of Paths

combinatorics, dp, math

Dog Snacks

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

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Make It Increasing

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

Zero Remainder Sum

dp

Number Deletion Game

*special problem, dp, games, greedy

Fruit Sequences

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

Danger of Mad Snakes

combinatorics, dp, math

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Subsequences of Length Two

dp, strings

Discrete Centrifugal Jumps

data structures, dp, graphs

Clear the Multiset

data structures, divide and conquer, dp, greedy

Yet Another Segments Subset

data structures, dp, graphs, sortings

Monster Invaders

dp, greedy, implementation

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Village (Minimum)

*special problem, dp, greedy, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Sum of Digits

brute force, constructive algorithms, dp, greedy

Omkar and Circle

brute force, dp, games, greedy

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Flying Sort (Hard Version)

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

Flying Sort (Easy Version)

dp, greedy, two pointers

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

Graph Coloring

dfs and similar, dp, graphs

Decreasing Heights

brute force, dp