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day10 | ||
README.md |
Unique Binary Search Trees
Given n
, how many structurally unique BST's (binary search trees) that store values 1 ... n
?
Examples
Input: 3
Output: 5
Explanation:
Given n = 3, there are a total of 5 unique BST's:
1 3 3 2 1
\ / / / \ \
3 2 1 1 3 2
/ / \ \
2 1 2 3
Constraints
1 <= n <= 19
Notes
- N/A