Clear the Multiset

data structures, divide and conquer, dp, greedy

Yet Another Segments Subset

data structures, dp, graphs, sortings

Controversial Rounds

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

Monster Invaders

dp, greedy, implementation

Boboniu and Jianghu

dp, greedy, sortings, trees

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Twilight and Ancient Scroll (easier version)

dp, hashing, implementation, string suffix structures, strings

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

ZS Shuffles Cards

combinatorics, dp, math, probabilities

Omkar and Pies

bitmasks, dfs and similar, dp, math, shortest paths

505

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

Directing Edges

dfs and similar, dp, graphs, trees

Bicolored Segments

data structures, dp, graph matchings, sortings

Viruses

*special problem, dp, shortest paths, string suffix structures

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

Strange Operation

combinatorics, data structures, dp

String Transformation 2

bitmasks, dp, graphs, trees

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Strange Addition

data structures, dp, matrices

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Sum of Digits

brute force, constructive algorithms, dp, greedy

Omkar and Last Floor

dp, greedy, two pointers

Omkar and Circle

brute force, dp, games, greedy

Asterism (Hard Version)

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

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

BareLee

dfs and similar, dp, games

Breadboard Capacity (easy version)

dp, flows, greedy

Flying Sort (Hard Version)

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

Flying Sort (Easy Version)

dp, greedy, two pointers

Construct the String

data structures, dp, strings

Jog Around The Graph

binary search, dp, geometry, graphs

Two Arrays

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

Rotating Substrings

dp, strings

Tree Shuffling

dfs and similar, dp, greedy, trees

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Graph Coloring

dfs and similar, dp, graphs

Decreasing Heights

brute force, dp

Slime and Sequences (Hard Version)

dp, fft, math

Slime and Sequences (Easy Version)

dp, fft, math

Slime and Hats

constructive algorithms, dp, greedy

Phoenix and Berries

brute force, dp, greedy, math

Pac-Man 2.0

*special problem, dp

Quantifier Question

dfs and similar, dp, graphs, math

Make It Ascending

bitmasks, brute force, dp

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Nested Rubber Bands

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

Kaavi and Magic Spell

dp, strings

Strange Function

binary search, data structures, dp, greedy

Independent Set

dfs and similar, dp, trees

Letters and Question Marks

bitmasks, dp, string suffix structures

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Spiderweb Trees

dp, geometry, trees

Wise Men (Hard Version)

bitmasks, dp, math

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Assigning Fares

dp, trees

Reality Show

bitmasks, dp

Treeland and Viruses

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

Team Building

bitmasks, dp, greedy, sortings

Happy New Year

bitmasks, dp, implementation

Autocompletion

data structures, dfs and similar, dp

Array Shrinking

dp, greedy

Strange Function

dp

Tourism

dp, graphs, probabilities

Au Pont Rouge

binary search, dp, strings

Double Elimination

dp, implementation

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

Erase Subsequences

dp, strings

Nanosoft

binary search, data structures, dp, implementation

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

String Coloring (hard version)

data structures, dp

Good Contest

combinatorics, dp, probabilities

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Nora's Toy Boxes

bitmasks, combinatorics, dp

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Making Shapes

dp

Minimax Problem

binary search, bitmasks, dp

Harry The Potter

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

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Miss Punyverse

dp, greedy, trees

New Year and Handle Change

binary search, dp

New Year Permutations

combinatorics, dp

Cards

combinatorics, dp, math, number theory, probabilities

Tree Elimination

dp, trees

Two Bracket Sequences

dp, strings, two pointers

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Happy Cactus

dp

Domino for Young

dp, greedy, math

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees