SIG Interview Questions — 7 DSA Problems

7 problems with full solutions in Python, Java, C++, JavaScript, Go, Rust.

Most frequently asked SIG LeetCode questions for software engineering interviews.

• Validate Binary Search Tree (MEDIUM) — Tree, Depth-First Search, Binary Search Tree, Binary Tree
• Text Justification (HARD) — Array, String, Simulation
• Kth Largest Element in an Array (MEDIUM) — Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
• Add Binary (EASY) — Math, String, Bit Manipulation, Simulation
• Spiral Matrix (MEDIUM) — Array, Matrix, Simulation
• Block Placement Queries (HARD) — Array, Binary Search, Binary Indexed Tree, Segment Tree
• Number of Black Blocks (MEDIUM) — Array, Hash Table, Enumeration