Milan

Anagram

sort  strings 

Angry Professor

patterns 

Balanced Brackets

stack 

Beautiful Triplets

binary search  frequency table  manifold 

CamelCase

patterns 

Circular Array Rotation

math 

Climbing the Leaderboard

binary search  sorted sequence 

Closest Numbers

pattern  sort 

Compare the Triplets

patterns 

Counting Valleys

patterns 

Electronics Shop

2 pointers  sorting 

Equal Stacks

prefix sum 

Evaluate Expression

design  stack 

Even Tree

tree 

Fair Rations

math  ad hoc 

Find Kth Zero

binary search 

Find the Missing Value

manifold  frequency-table  math 

Fixed Adjacent Values

ad hoc 

Flatland Space Stations

prefix sum 

Gaming Array

prefix-sum  patterns  games 

Gemstones

hashtable  frequency table 

Hidden unique integers

strings  patterns 

Impress the Interviewer

binary search  constrained 

Jesse and Cookies

priority queue 

Jim and the Orders

patterns  sort 

Left Rotation

patterns 

Making Anagrams

strings  frequency table 

Mark and Toys

sort 

Mars Exploration

patterns 

Max Min

patterns  sort  functional 

Minimum Distances

hashtable 

Minimum Index Distance

ad hoc 

Minimum Loss

binary search  patterns  sort 

Number of Subordinates

binary search  sort  prefix sum 

Odd or Even Sum

prefix sum 

One Swap

patterns  ad-hoc 

Pairs

sorting  hashtable  binary-search 

Palindrome Index

patterns  strings 

Picking Numbers

sort  frequency table  prefix sum 

Queue Using Two Stacks

constrained  stack 

Roman Number

binary search 

Sherlock and Pairs

frequency table 

Sherlock and Squares

math 

Simple Text Editor

stack 

Simplify Path

stack 

Smallest Rearrangement Spell

frequency table 

String Construction

sort  frequency-table 

Strong Password

manifold  bitset  design 

Student Sections

binary search  prefix sum  manifold 

Super Reduced String

strings 

The Absent Students

sort  manifold 

The Love-Letter Mystery

patterns 

The Lucky Employee

frequency table  prefix sum  hashtable 

The Master of Cryptocurrencies

patterns 

The Most Frequent

frequency table  hashtable 

Weighted Uniform String

sort  binary search