If you're new to LeetCode, it's best to start with easy-to-medium problems that cover fundamental concepts like arrays, strings, and dynamic programming. Here’s a structured list to help you build confidence:

🔥 Must-Do Problems for Beginners

1. Arrays & Hashing 🧩

✔️ Two Sum (💡 Hash Map)
✔️ Best Time to Buy and Sell Stock (💡 Greedy)
✔️ Contains Duplicate (💡 Set)
✔️ Product of Array Except Self (💡 Prefix Product)
✔️ Majority Element (💡 Boyer-Moore)

2. Strings & Sliding Window ✍️

✔️ Valid Anagram (💡 Hashing)
✔️ Longest Substring Without Repeating Characters (💡 Sliding Window)
✔️ Reverse String (💡 Two Pointers)
✔️ First Unique Character in a String (💡 Hash Map)
✔️ Implement strStr() (💡 String Search)

3. Binary Search 🔍

✔️ Binary Search (💡 Classic)
✔️ Find First and Last Position of Element in Sorted Array (💡 Modified Binary Search)
✔️ Search a 2D Matrix (💡 Matrix Binary Search)
✔️ Guess Number Higher or Lower (💡 Simple Binary Search)

4. Two Pointers 🤝

✔️ Merge Sorted Array
✔️ Move Zeroes
✔️ Two Sum II – Input Array is Sorted
✔️ Valid Palindrome
✔️ Container With Most Water

5. Dynamic Programming (Easy Intro) 🚀

✔️ Climbing Stairs (💡 Fibonacci DP)
✔️ House Robber (💡 Simple DP)
✔️ Maximum Subarray (💡 Kadane’s Algorithm)
✔️ Unique Paths (💡 Grid DP)
✔️ Coin Change (💡 Classic DP)

🛠️ How to Approach These Problems?

1️⃣ Understand the problem statement (write it in your own words).
2️⃣ Identify the best approach (brute force → optimized).
3️⃣ Write code & debug (use print statements if needed).
4️⃣ Optimize using better techniques (hash maps, two pointers, DP).
5️⃣ Repeat & practice (do similar problems to reinforce learning).