HCL Interview Questions — 9 DSA Problems

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

Most frequently asked HCL LeetCode questions for software engineering interviews.

• Valid Parentheses (EASY) — String, Stack
• Longest Substring Without Repeating Characters (MEDIUM) — Hash Table, String, Sliding Window
• Merge Sorted Array (EASY) — Array, Two Pointers, Sorting
• Longest Common Prefix (EASY) — String, Trie
• Group Anagrams (MEDIUM) — Array, Hash Table, String, Sorting
• Two Sum (EASY) — Array, Hash Table
• 3Sum (MEDIUM) — Array, Two Pointers, Sorting
• Palindrome Number (EASY) — Math
• Reverse String (EASY) — Two Pointers, String