| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 1 | Depth-first search: recursive traversal | Algorithms & Recursion | Coding | Medium |
| 2 | Two pointers, and the moment they meet | Algorithms & Recursion | gap | Medium |
| 3 | Shrink until everyone agrees | Algorithms & Recursion | gap | Medium |
| 4 | Four walls, closing in | Algorithms & Recursion | gap |
| Medium |
| 5 | Which box does this cell belong to? | Algorithms & Recursion | gap | Medium |
| 6 | The same check, in one pass of methods | Algorithms & Recursion | Coding | Medium |
| 7 | The same prefix, without shrinking a guess | Algorithms & Recursion | Coding | Medium |
| 8 | Where is the black queen? | Algorithms & Recursion | gap | Medium |