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16 problems total
| Title | Difficulty | Videos | Companies |
|---|---|---|---|
| Find the Index of the First Occurrence in a String | easy | - | |
| Next Permutation | medium | - | |
| Longest Valid Parentheses | hard | - | |
| Combination Sum 1 | medium | ||
| Permutations of Array 1 | medium | - | |
| Spiral Matrix 1 - Return | medium | ||
| Surrounded Regions | medium | - | |
| Rotate an Array to Right | medium | - | |
| Count Primes | medium | - | |
| Peeking Iterator | medium | - | |
| Find Duplicate Number in array containing n+1 numbers between 1 and n | medium | - | |
| Find Median from Data Stream | hard | ||
| Serialize and Deserialize Binary Tree | hard | ||
| Odd Even Linked List - Bring odd nodes first and even later | medium | - | |
| Top K Frequent Elements | medium | ||
| Maximum Width Ramp | medium | - |