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

Finding lines

constructive algorithms, divide and conquer, interactive

Verifying Kingdom

binary search, divide and conquer, interactive, trees

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

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

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

Bear and Prime 100

constructive algorithms, interactive, math