XOR Guessing

bitmasks, interactive, math

Palindromic Paths

implementation, interactive

Knightmare (hard)

graphs, interactive, shortest paths

Knightmare (easy)

graphs, interactive, shortest paths

Alesya and Discrete Math

divide and conquer, interactive

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Lost Numbers

brute force, divide and conquer, interactive, math

Strange device

binary search, interactive, math, trees

Zigzag Game

games, interactive

Rainbow Coins

interactive

Guess the Root

brute force, interactive, math

Tree Diameter

bitmasks, graphs, interactive

Serval and Snake

binary search, brute force, interactive

Pink Floyd

graphs, interactive

Cooperative Game

constructive algorithms, interactive, number theory

Legendary Tree

binary search, interactive, trees

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

Arithmetic Progression

binary search, interactive, number theory, probabilities

Game with modulo

binary search, constructive algorithms, interactive

Dasha and Chess

constructive algorithms, games, interactive

New Year and the Factorisation Collaboration

interactive, math, number theory

Tricky Interactor

constructive algorithms, implementation, interactive

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Pick Heroes

greedy, implementation, interactive, sortings

Katya and Segments Sets

data structures, interactive, sortings

Lost Root

interactive, probabilities

Intersecting Subtrees

dfs and similar, interactive, trees

Dwarves, Hats and Extrasensory Abilities

binary search, constructive algorithms, geometry, interactive

Hidden Bipartite Graph

binary search, constructive algorithms, dfs and similar, graphs, interactive

Divisors

interactive, math, number theory

Subway Pursuit

binary search, interactive, probabilities

Guess the number

dp, interactive

Down or Right

constructive algorithms, interactive, matrices

The hat

binary search, interactive

Rocket

binary search, interactive

Guess two numbers

binary search, interactive

Jamie and To-do List

data structures, interactive, trees

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

Something with XOR Queries

brute force, interactive, probabilities

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Interactive LowerBound

brute force, interactive, probabilities

The penguin's game

binary search, constructive algorithms, interactive

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Glad to see you!

binary search, interactive

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Finding lines

constructive algorithms, divide and conquer, interactive

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Hongcow's Game

bitmasks, divide and conquer, interactive

Minimum and Maximum

constructive algorithms, interactive

Guess the Array

constructive algorithms, interactive, math

Searching Rectangles

binary search, constructive algorithms, interactive

Bear and Prime 100

constructive algorithms, interactive, math