Polyathlon

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

Alternative Platforms

combinatorics, data structures, fft, math, sortings

Barrels

data structures, greedy, math

Divide OR Conquer

bitmasks, data structures, dp, implementation

DIY

data structures, geometry, greedy, sortings

Natlan Exploring

bitmasks, combinatorics, data structures, dp, math, number theory

Ardent Flames

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

Sharky Surfing

data structures, greedy, two pointers

Reverse the Rivers

binary search, constructive algorithms, data structures, greedy

Yet Another Real Number Problem

binary search, data structures, divide and conquer, greedy, implementation, math

Sakurako and Chefir

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

Sakurako, Kosuke, and the Permutation

brute force, data structures, dfs and similar, dsu, graphs, greedy, math

Kousuke's Assignment

data structures, dp, dsu, greedy, math

Balanced

constructive algorithms, data structures, greedy, implementation, math

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Penchick and Chloe's Trees

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

Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

Orangutan Approved Subarrays

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

MEXimize the Score

combinatorics, data structures, dp, greedy, implementation, math

QED's Favorite Permutation

data structures, implementation, sortings

Balanced Problem

data structures, dp

Cool Graph

constructive algorithms, data structures, dfs and similar, dsu, graphs, greedy, trees

New Rating

binary search, data structures, dp, greedy

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

The Endspeaker (Hard Version)

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

Add Zeros

brute force, data structures, dfs and similar, dp, graphs, greedy

Bermart Ice Cream

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

Sums of Segments

binary search, data structures, dp, implementation, math

Action Figures

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

Variable Damage

data structures, flows

Attribute Checks

brute force, data structures, dp, implementation, math, two pointers

Hills and Pits

data structures, greedy, math, matrices

Billetes MX (Hard Version)

binary search, combinatorics, data structures, dsu, graphs

Digital Village (Extreme Version)

data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Adjust The Presentation (Hard Version)

constructive algorithms, data structures, greedy, implementation, sortings

Meaning Mean

data structures, greedy, math, sortings

Complex Segments (Hard Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Complex Segments (Easy Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Max Plus Min Plus Size

data structures, dp, dsu, greedy, implementation, matrices, sortings

Speedbreaker

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

Robin Hood Archery

data structures, divide and conquer, greedy, hashing

Milky Days

brute force, data structures, greedy, implementation

Robert Hood and Mrs Hood

brute force, data structures, greedy, sortings

Game in Tree (Hard Version)

binary search, data structures, trees

Game in Tree (Easy Version)

binary search, brute force, data structures, dp, games, greedy, implementation, trees

Stack and Queue

*special problem, data structures, divide and conquer

Good Subarray

*special problem, data structures, greedy

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, brute force, 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