Hunting Hoglins in Hogwarts

interactive

Broken Queries

binary search, bitmasks, brute force, constructive algorithms, implementation, interactive

Guess One Character

constructive algorithms, implementation, interactive

Kachina's Favorite Binary String

dp, greedy, interactive, two pointers

Library of Magic

binary search, constructive algorithms, divide and conquer, interactive, math, number theory

Genokraken

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

Penchick and Even Medians

binary search, constructive algorithms, interactive, probabilities

Asesino (Hard Version)

constructive algorithms, dp, interactive

Asesino (Easy Version)

binary search, brute force, constructive algorithms, implementation, interactive

Password Cracking

constructive algorithms, interactive, strings

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

Ruler (hard version)

binary search, interactive, ternary search

Ruler (easy version)

binary search, interactive

Fortnite

combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings

Grid Game

constructive algorithms, games, graph matchings, greedy, interactive

Coloring Game

constructive algorithms, dfs and similar, games, graphs, greedy, interactive

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

Fumo Temple

interactive

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Tensor

constructive algorithms, graphs, interactive

Cat, Fox and Maximum Array Split

brute force, interactive, math

Arithmancy (Hard)

interactive

Arithmancy (Medium)

constructive algorithms, interactive, probabilities, strings

Arithmancy (Easy)

brute force, constructive algorithms, interactive, strings

Draw Polygon Lines

*special problem, constructive algorithms, dp, geometry, interactive

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

XOR Break --- Game Version

bitmasks, games, greedy, interactive

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Tree Diameter

interactive, trees

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Cursed Game

interactive

Geo Game

greedy, interactive, math

Pepe Racing

constructive algorithms, implementation, interactive, sortings

Good Colorings

binary search, constructive algorithms, graphs, interactive

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

Salyg1n and Array (hard version)

constructive algorithms, interactive

Salyg1n and Array (simple version)

constructive algorithms, interactive, math

Salyg1n and the MEX Game

constructive algorithms, data structures, games, greedy, interactive

Rollbacks (Hard Version)

data structures, interactive, trees

More Wrong

divide and conquer, interactive

Michael and Hotel

binary search, interactive, trees

Triangle Platinum?

brute force, combinatorics, implementation, interactive, math, probabilities

Rudolph and Mimic

constructive algorithms, implementation, interactive

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Decreasing Game

constructive algorithms, dfs and similar, dp, greedy, interactive

Stuck Conveyor

binary search, constructive algorithms, interactive

Fading into Fog

geometry, interactive, math, probabilities

Roads in E City

interactive, math, probabilities, trees

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Expected Twist

*special problem, interactive

Interview

binary search, implementation, interactive

Li Hua and Chess

constructive algorithms, greedy, interactive

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Spinach Pizza

games, geometry, greedy, interactive

Library game

games, greedy, interactive, sortings

Interactive Factorial Guessing

brute force, games, implementation, interactive

Hot and Cold

binary search, interactive

Guess the String

constructive algorithms, interactive, probabilities

Doremy's Perfect DS Class (Hard Version)

binary search, interactive

Doremy's Perfect DS Class (Medium Version)

binary search, interactive

Doremy's Perfect DS Class (Easy Version)

binary search, interactive

GCD Queries

constructive algorithms, interactive, number theory

Centroid Guess

interactive, probabilities, trees

Joking (Hard Version)

dp, interactive

Joking (Easy Version)

binary search, constructive algorithms, interactive, ternary search

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

Guess the Cycle Size

interactive, probabilities

Matching Reduction

brute force, constructive algorithms, dfs and similar, flows, graph matchings, graphs, interactive

Crop Squares

constructive algorithms, geometry, interactive, math

Tournament Countdown

constructive algorithms, greedy, interactive, number theory, probabilities

Mark and the Online Exam

bitmasks, constructive algorithms, interactive, probabilities

Fixed Point Guessing

binary search, constructive algorithms, interactive

Guess The String

binary search, constructive algorithms, interactive

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

notepad.exe

binary search, constructive algorithms, greedy, interactive

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Treasure Hunt

graphs, interactive

Finding Zero

constructive algorithms, interactive, math

Perfect Matching

data structures, divide and conquer, interactive, trees

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Interacdive Problem

binary search, constructive algorithms, interactive

Hidden Permutations

dfs and similar, interactive, math

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math