Yunli's Subarray Queries (extreme version)

data structures, dp, implementation

Yunli's Subarray Queries (hard version)

binary search, data structures, dp

Yunli's Subarray Queries (easy version)

binary search, data structures, two pointers

Firefly's Queries

bitmasks, data structures, flows, math

Alternating String

brute force, data structures, dp, greedy, implementation, strings

Index and Maximum Value

data structures, greedy

Iris's Full Binary Tree

brute force, data structures, dfs and similar, trees

Iris and Adjacent Products

data structures, greedy, implementation, math

Eri and Expanded Sets

data structures, divide and conquer, math, number theory, two pointers

Iris and the Tree

brute force, data structures, dfs and similar, dsu, math, trees

Subtangle Game (Hard Version)

data structures, dp, games, greedy, implementation

Alter the GCD

binary search, data structures, divide and conquer, implementation, number theory

Substring Compression

data structures, dp, matrices

Make a Palindrome

binary search, brute force, data structures, greedy, math

Colored Portals

binary search, brute force, data structures, graphs, greedy, implementation, shortest paths

Turtle and Three Sequences

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

Turtle and Inversions (Hard Version)

brute force, data structures, divide and conquer, dp, greedy, math, two pointers

Cosmic Rays

brute force, data structures, dp

DFS Checker (Hard Version)

binary search, data structures, dfs and similar, graphs, hashing, trees

DFS Checker (Easy Version)

brute force, data structures, dfs and similar, graphs, hashing, trees

Longest Max Min Subsequence

brute force, constructive algorithms, data structures, greedy, implementation

Ksyusha and the Loaded Set

binary search, brute force, data structures, implementation

Photoshoot for Gorillas

combinatorics, data structures, greedy, math

Numeric String Template

data structures, strings

Eliminating Balls With Merging (Hard Version)

binary search, brute force, data structures, divide and conquer, greedy, implementation

Eliminating Balls With Merging (Easy Version)

binary search, brute force, data structures, divide and conquer, greedy

Determine Winning Islands in Race

data structures, dp, graphs, greedy, shortest paths

Level Up

binary search, brute force, data structures, divide and conquer, implementation

Even Positions

constructive algorithms, data structures, greedy

Penacony

brute force, data structures, graphs, greedy, hashing

Decode

combinatorics, data structures, implementation, math

Let Me Teach You a Lesson (Hard Version)

data structures, dp, matrices, two pointers

Let Me Teach You a Lesson (Easy Version)

2-sat, data structures, dp, matrices, two pointers

Bouquet (Hard Version)

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

Polygonal Segments

brute force, data structures, divide and conquer, dp, greedy, two pointers

Catch the Mole(Hard Version)

binary search, data structures, dfs and similar, divide and conquer, interactive, trees

Catch the Mole(Easy Version)

binary search, data structures, dfs and similar, interactive, trees

Smithing Skill

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

Range Minimum Sum

binary search, brute force, data structures, divide and conquer, implementation

Wonderful Tree!

brute force, data structures, dfs and similar, dsu, greedy, trees

Permutation Problem (Hard Version)

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

Permutation Problem (Simple Version)

binary search, brute force, combinatorics, data structures, math, number theory

Update Queries

data structures, greedy, sortings

Matrix Stabilization

brute force, data structures, greedy, sortings

Maximize the Largest Component (Hard Version)

data structures, dfs and similar, dp, dsu, implementation

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Final Boss

binary search, data structures

array-value

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

Swap Dilemma

constructive algorithms, data structures, divide and conquer, greedy, math, sortings

Sorting Problem Again

binary search, data structures, sortings

Beauty of the mountains

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

Boring Day

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

Turtle and Paths on a Tree

data structures, dp, trees

Turtle and Intersected Segments

data structures, dsu, graphs, greedy

Yasya and the Mysterious Tree

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

Field Division (easy version)

data structures, math, sortings

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

Manhattan Triangle

binary search, constructive algorithms, data structures, geometry, implementation, two pointers

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Computing Machine

brute force, data structures, dp, greedy, implementation

Elections

data structures, greedy, implementation, math

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Nikita and LCM

brute force, data structures, dp, greedy, math, number theory, sortings

Remove Bridges

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

Splittable Permutations

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

Invertible Bracket Sequences

binary search, combinatorics, data structures, divide and conquer, implementation, two pointers

Chain Queries

binary search, data structures, dfs and similar, implementation, trees

Money Buys Less Happiness Now

data structures, greedy, sortings

Cutting Game

binary search, brute force, data structures, implementation, sortings, two pointers

Beautiful Triple Pairs

combinatorics, data structures

Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

XOUR

data structures, dsu, sortings

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Shop Game

data structures, greedy, math, sortings

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Division + LCP (easy version)

binary search, data structures, dp, hashing, string suffix structures, strings

Equal XOR Segments

binary search, data structures

Next and Prev

brute force, data structures, implementation

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Conference

data structures, flows

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Frequency Mismatch (Easy Version)

binary search, data structures, divide and conquer, hashing, probabilities, trees

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Nene's Game

binary search, brute force, data structures, games, greedy

Inaccurate Subsequence Search

data structures, two pointers

Progressive Square

constructive algorithms, data structures, implementation, sortings

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Inversion Composition

constructive algorithms, data structures, greedy

Battle Cows

binary search, data structures, greedy

Nobody is needed

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

GCD is Greater

brute force, data structures, math, number theory

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

Kirill and Mushrooms

data structures, sortings

Farmer John's Favorite Intern

data structures, dp, flows, trees

Farmer John's Favorite Function

brute force, data structures, implementation, math

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Rudolf and k Bridges

binary search, data structures, dp, two pointers

Almost Certainly

*special problem, constructive algorithms, data structures, sortings

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Bitwise Paradox

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