Created
May 29, 2014 00:52
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| public class Solution { | |
| public int numTrees(int n) { | |
| if (n == 0) return 1; | |
| if (n == 1) return 1; | |
| if (n == 2) return 2; | |
| int ret = 0; | |
| for (int i = 1; i <= n; i++){ | |
| ret = ret + numTrees(i - 1) * numTrees(n - i); | |
| } | |
| return ret; | |
| } | |
| } |
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回归BST定义w