| 題號 | 題目 | 類別 | 題解 |
|---|---|---|---|
| 1 | Two Sum | Hash Table | Hash Table |
| 2 | Add Two numbers | Linked List | Recursion |
| 201 | Bitwise AND of Numbers Range | Bitwise Operation | Lowbit = x&(~x+1) |
| 204 | Count Primes | Math Thetory | The Sieve of Eratosthenes |
| 408 | Valid Word Abbreviation | Two Pointers | 字串轉數字 |