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10 questions

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CodingMediumLeetCode 394
Decode String
Decode a string containing nested repeat patterns of the form k[encoded_string], expanding each bracketed segment k times (k may be multi-digit) possibly with multiple nesting…
Companies: Bloomberg, Coupang, Google, Microsoft +4
Recursion · Stack · String
Last reported Aug 2026
Open workspace
CodingHardLeetCode 25
Reverse Nodes in k-Group
Given the head of a linked list and an integer k, reverse the nodes of the list k at a time and return the modified…
Companies: Adobe, Microsoft, TikTok
Linked List · Recursion
Last reported May 2026
Open workspace
CodingEasyLeetCode 234
Palindrome Linked List
Companies: eBay, Meta, Microsoft

Linked List · Recursion · Stack · Two Pointers

Last reported May 2026

CodingHardLeetCode 772

Basic Calculator III

Evaluate a string arithmetic expression containing integers, +, -, *, /, parentheses and unary signs, respecting operator precedence and parentheses. The challenge is to parse…

Companies: Google, Intuit, Meta

Math · Recursion · Stack · String

Last reported May 2026

CodingHardLeetCode 273

Integer to English Words

Convert a non-negative integer to its English words representation. The core challenge is chunking the number into three-digit groups (ones, thousands, millions, billions)…

Companies: Amazon, Microsoft

Math · Recursion · String

Last reported Mar 2026

CodingEasyLeetCode 21

Merge Two Sorted Lists

Companies: Adobe, Google, LinkedIn, Meta +2

Linked List · Recursion

Last reported Feb 2026

CodingMediumLeetCode 2

Add Two Numbers

Companies: Amazon, Bloomberg, Google, Meta +2

Linked List · Math · Recursion

Last reported Oct 2025

CodingMediumLeetCode 1823

Find the Winner of the Circular Game

Given n people seated in a circle, repeatedly remove every k-th person clockwise until one remains and return their label — the classic Josephus problem…

Companies: Goldman Sachs

Array · Math · Queue · Recursion

CodingMediumLeetCode 779

K-th Symbol in Grammar

Given a binary sequence that evolves each row by replacing 0→01 and 1→10 (so row lengths double each time), return the k-th symbol in the…

Companies: D. E. Shaw

Bit Manipulation · Math · Recursion

CodingEasyLeetCode 206

Reverse Linked List

Companies: Apple, TikTok

Linked List · Recursion