| Keywords | Solutions |
|---|---|
| 1 d array | sort it reverse it two pointes sliding window |
| 2d array with pair like [[1,2], [2,3]] | Can it be a graph problem? |
| If you see characters like ‘(‘, ‘)’, ‘*’ | Can we use stack ? |
| Shortest Path in an unweighted graph cycle detection crawlers in search engine broadcasting social networking search |
BFS |
| Substring | Two pointer, Sliding window |
| string | Use StringBuilder |