Find the Zero

constructive algorithms, interactive

Alternating Path

constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, graphs

Two Towers

*special problem, greedy, math

Sub-RBS (Easy Version)

combinatorics, constructive algorithms, dp, greedy, strings, two pointers

Battle of Arrays

data structures, games, greedy

Kanade's Perfect Multiples

brute force, 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

Dungeon

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

Beautiful Permutation

binary search, interactive

Annoying Game

dp, games, greedy

Meximum Array 2

constructive algorithms, greedy, implementation, math

Maximum GCD on Whiteboard

greedy, math, number theory

No Cost Too Great (Easy Version)

greedy, implementation, math, number theory

Triple Removal

data structures, greedy, math

Incremental Stay

greedy, implementation, math

The Nether

graphs, interactive

The Cunning Seller (hard version)

binary search, greedy, math

Adjacent XOR

brute force, greedy

Arboris Contractio

data structures, graphs, greedy, trees

Trip Shopping

games, greedy, sortings

G-C-D, Unlucky!

math, number theory

MEX Count

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

Divine Tree

constructive algorithms, greedy, math, sortings, trees

Kirei Attacks the Estate

dfs and similar, dp, greedy, trees

Come a Little Closer

brute force, greedy, implementation, math

Creating a Schedule

constructive algorithms, data structures, greedy, implementation, sortings

Racing

constructive algorithms, greedy

Array and GCD

binary search, greedy, math, number theory

Sasha and the Apartment Purchase

math, sortings

Sports Betting

2-sat, brute force, math, sortings

Skibidi Table

bitmasks, implementation

You Soared Afar With Grace

constructive algorithms, data structures, greedy, implementation

Counting Points

brute force, data structures, geometry, implementation, two pointers

Object Identification

graphs, greedy, implementation, interactive

The Trail

brute force, constructive algorithms, greedy, math, two pointers

Saraga

greedy, strings

Bridge Renovation

brute force, dp, greedy, math, two pointers

DIY

data structures, geometry, greedy, sortings

Bonus Project

games, greedy

Alya and Permutation

bitmasks, constructive algorithms, math

Trapped in the Witch's Labyrinth

constructive algorithms, dfs and similar, graphs, implementation

Sakurako, Kosuke, and the Permutation

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

Sakurako's Field Trip

dp, greedy, two pointers

Trinity

binary search, math, sortings, two pointers

Alice's Adventures in Permuting

binary search, implementation, math

Bitwise Balancing

bitmasks, hashing, implementation, math, schedules, ternary search

Robert Hood and Mrs Hood

brute force, data structures, greedy, sortings

Password Cracking

constructive algorithms, interactive, strings

Message Transmission Error (easy version)

brute force, strings

Klee's SUPER DUPER LARGE Array!!!

binary search, math, ternary search

Satyam and Counting

geometry, math

Sakurako's Box

combinatorics, math, number theory

Photoshoot for Gorillas

combinatorics, data structures, greedy, math

Light Switches

implementation, math

Two Movies

greedy, math

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

GCD-sequence

greedy, implementation, math, number theory

Ingenuity-2

constructive algorithms, greedy, implementation

Beautiful Triple Pairs

combinatorics, data structures

Game on Tree (Easy)

games

Reverse Card (Easy Version)

brute force, math, number theory

Permutation Counting

binary search, greedy, implementation, math, sortings

Everything Nim

games, greedy, math, sortings

Clock in the Pool

*special problem, math

Inaccurate Subsequence Search

data structures, two pointers

Ticket Hoarding

greedy, math, sortings

Card Game

greedy, implementation

LR-remainders

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

Anna and the Valentine's Day Gift

games, greedy, math, sortings

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Klever Permutation

constructive algorithms, math, two pointers

Find B

constructive algorithms, greedy

Grouping Increases

data structures, dp, greedy

XOR-distance

bitmasks, greedy, implementation, math

Game with Marbles (Hard Version)

games, greedy, sortings

Game with Marbles (Easy Version)

brute force, games, greedy, sortings

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings

Jumping Through Segments

binary search, constructive algorithms

Largest Subsequence

greedy, strings

Array Game

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

Theofanis' Nightmare

constructive algorithms, greedy

Add, Divide and Floor

constructive algorithms, greedy, math

Matching Arrays

binary search, constructive algorithms, greedy, sortings

Torn Lucky Ticket

brute force, dp, hashing, implementation, math

Anonymous Informant

brute force, dfs and similar, graphs, implementation

Dances (Easy version)

binary search, greedy, two pointers

You Are So Beautiful

data structures

Iva & Pav

binary search, bitmasks, data structures, greedy

Jellyfish and Green Apple

bitmasks, greedy, math, number theory

Battling with Numbers

combinatorics, math, number theory

Two-Colored Dominoes

constructive algorithms, greedy

Game on Permutation

data structures, dp, games, greedy

Dual (Easy Version)

constructive algorithms, math

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Strong Password

binary search, dp, greedy, strings

Row Major

constructive algorithms, greedy, math, number theory, strings

Wooden Toy Festival

binary search, greedy, sortings

No Prime Differences

constructive algorithms, math, number theory