First or Second

dp, greedy, implementation

Impost or Sus

dp, greedy, implementation, strings

Yes or Yes

greedy, strings

Omega Numbers

bitmasks, combinatorics, dp, math, number theory

Remove at the lowest cost

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

Fibonacci Paths

data structures, dp, graphs, sortings

Odd Process

greedy, sortings

Optimal Shifts

bitmasks, greedy, strings

Operations with Inversions

greedy, implementation, math

XOR Array

constructive algorithms, math

Little Fairy's Painting

implementation

Mosaic Tree

combinatorics, dp, fft, math, trees

Game of Scientists (Version 2)

binary search, chinese remainder theorem, dfs and similar, interactive, math

Game of Scientists (Version 1)

chinese remainder theorem, constructive algorithms, interactive, math

Secret Message

data structures, dp, greedy, trees

Beautiful Patterns (Hard Version)

combinatorics, math, probabilities

Beautiful Patterns (Easy Version)

combinatorics, math, probabilities

Wishing Cards

dp

Needle in a Haystack

greedy, strings, two pointers

Isla's Memory Thresholds

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

Shiro's Mirror Duel

constructive algorithms, greedy, interactive, probabilities, sortings

Taiga's Carry Chains

bitmasks, brute force, dp, greedy, math

Kanade's Perfect Multiples

brute force, constructive algorithms, greedy, number theory

Niko's Tactical Cards

dp, greedy, math

Sleeping Through Classes

greedy, implementation

New Kingdom

constructive algorithms, graphs, implementation

Maximum Distance To Port

graphs, shortest paths

Maximum Color Segment

dp, implementation

Kindergarten Homework

implementation, strings

Sliding Tiles

data structures, divide and conquer, dsu

Birthday

geometry

Shuffling Cards with Problem Solver 68!

hashing, string suffix structures, strings

Gene Editor

Cluster Computing System

graphs, greedy, math

Number Maze

implementation

Divisor Card Game

combinatorics, dp

Circles Are Far from Each Other

binary search, greedy

Buses

greedy, sortings

ASCII Art Contest

implementation

Shiori Miyagi and Maximum Array Score

binary search, data structures, dp, sortings

Sakura Adachi and Optimal Sequences

bitmasks, combinatorics, greedy, math

Rae Taylor and Trees (hard version)

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

Anisphia Wynn Palettia and Good Permutations

constructive algorithms, greedy, number theory

Rae Taylor and Trees (easy version)

binary search, data structures, dp, dsu, greedy, implementation, trees

Renako Amaori and XOR Game (hard version)

bitmasks, games, greedy

Renako Amaori and XOR Game (easy version)

bitmasks, games, greedy

Yuu Koito and Minimum Absolute Sum

math

Shizuku Hoshikawa and Farm Legs

brute force, math

Build XOR on a Segment

bitmasks, dp

Binary Strings and Blocks

combinatorics, data structures, dp

Almost Roman

constructive algorithms, greedy, implementation

Quotient and Remainder

binary search, greedy, two pointers

Addition on a Segment

greedy, math

Maximum Neighborhood

bitmasks, brute force, greedy, implementation, math

Subsequence Problem

combinatorics, dp, fft, math

Points Selection

dp, greedy

Removal of a Sequence (Hard Version)

binary search, divide and conquer, greedy, implementation, math, number theory

Removal of a Sequence (Easy Version)

binary search, implementation, math, number theory

Range Operation

dp, greedy, math, two pointers

Drifting Away

greedy, implementation

Alice and Bob

greedy, implementation

Intercepting Butterflies

bitmasks, communication, constructive algorithms, graphs, interactive

Locate

binary search, combinatorics, communication, constructive algorithms, greedy, interactive

Encode and Decode (Hard Version)

bitmasks, communication, interactive, math

Encode and Decode (Easy Version)

communication, constructive algorithms, interactive

Mukhammadali and the Smooth Array

data structures, dp

Tree, TREE!!!

dfs and similar, dp, math, trees

khba Loves to Sleep!

binary search, data structures, geometry, greedy, implementation

Yet Another Array Problem

brute force, implementation, math, number theory

Isamatdin and His Magic Wand!

constructive algorithms, greedy, implementation, sortings

Your Name

sortings, strings

Square?

math, sortings

Tab Closing

math

Same Difference

brute force, greedy, strings

Arctic Acquisition

data structures, greedy

Rainbow Branch

constructive algorithms, dp, greedy, trees

Path Split

graph matchings, greedy

Binary Wine

bitmasks, greedy, math

Marble Council

dp, math, sortings

Cyclic Merging

constructive algorithms, greedy

PalindromePalindrome

data structures, strings

Pointless Machine

constructive algorithms, graphs, interactive, trees

Chain Prefix Rank (Hard Version)

binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees

Chain Prefix Rank (Easy Version)

combinatorics, dfs and similar, dp, math, trees

Journey

data structures, dfs and similar, dsu, graphs, greedy

Copy String

greedy, implementation, strings, two pointers

Dungeon

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

Even Modulo Pair

brute force, math, number theory

Sequence Game

brute force, sortings

Plegma

bitmasks, combinatorics, communication, interactive

Diadrash (Hard Version)

binary search, interactive, math, sortings

Diadrash (Easy Version)

binary search, brute force, divide and conquer, implementation, interactive

Monopati

brute force, combinatorics, dp, math, two pointers

Siga ta Kymata

constructive algorithms, greedy, implementation, math

Souvlaki VS. Kalamaki

brute force, greedy, math, sortings

Beautiful Problem

dp

Beautiful Tree

constructive algorithms, math, probabilities, trees

Beautiful Intervals

constructive algorithms, greedy

Beautiful Palindromes

constructive algorithms, greedy, schedules

Beautiful Permutation

binary search, interactive