【LeetCode从零单排】No96Unique Binary Search Trees

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题目

Given n, how many structurally unique BST's (binary search trees) that store values 1...n?

For example,
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

百度这个说的挺好：点击打开链接

代码

public class Solution {    public int numTrees(int n) {    int [] G = new int[n+1];    G[0] = G[1] = 1;    for(int i=2; i<=n; ++i) {        for(int j=1; j<=i; ++j) {            G[i] += G[j-1] * G[i-j];        }    }    return G[n];}}

代码下载：https://github.com/jimenbian/GarvinLeetCode

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