Siemens Interview Questions — 25 DSA Problems

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

Most frequently asked Siemens LeetCode questions for software engineering interviews.

• Minimized Maximum of Products Distributed to Any Store (MEDIUM) — Array, Binary Search, Greedy
• Peaks in Array (HARD) — Array, Binary Indexed Tree, Segment Tree
• Number of Islands (MEDIUM) — Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
• Valid Parentheses (EASY) — String, Stack
• Merge Intervals (MEDIUM) — Array, Sorting
• Reverse Linked List (EASY) — Linked List, Recursion
• Contains Duplicate (EASY) — Array, Hash Table, Sorting
• LFU Cache (HARD) — Hash Table, Linked List, Design, Doubly-Linked List
• The Skyline Problem (HARD) — Array, Divide and Conquer, Binary Indexed Tree, Segment Tree, Line Sweep, Heap (Priority Queue), Ordered Set
• Best Time to Buy and Sell Stock (EASY) — Array, Dynamic Programming
• Merge Two Sorted Lists (EASY) — Linked List, Recursion
• Letter Combinations of a Phone Number (MEDIUM) — Hash Table, String, Backtracking
• Maximum Product of Three Numbers (EASY) — Array, Math, Sorting
• Minimum Add to Make Parentheses Valid (MEDIUM) — String, Stack, Greedy
• Group Anagrams (MEDIUM) — Array, Hash Table, String, Sorting
• Remove Duplicates from Sorted Array (EASY) — Array, Two Pointers
• Angle Between Hands of a Clock (MEDIUM) — Math
• Two Sum (EASY) — Array, Hash Table
• Palindrome Linked List (EASY) — Linked List, Two Pointers, Stack, Recursion
• Valid Anagram (EASY) — Hash Table, String, Sorting
• Rotate List (MEDIUM) — Linked List, Two Pointers
• 3Sum (MEDIUM) — Array, Two Pointers, Sorting
• Largest Number (MEDIUM) — Array, String, Greedy, Sorting
• First Missing Positive (HARD) — Array, Hash Table
• Seat Reservation Manager (MEDIUM) — Design, Heap (Priority Queue)