- Sliding Window (XXX substring/subarray !!! Continous. Do care about what's between left-right pointers)
- Fixed Size (pretty similar to two pointers)
- 1456
- Dynamic Size
- 1004
- 209
- 3 (#hashtable)
- Fixed Size (pretty similar to two pointers)
- Two Pointers (mainly focus on values for those two pointer instead of everything inside the window)
- 19 (#linkedlist)
- DP
- Backtracking
- combination of element/choices
- Greedy
- linked list
- binary tree
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