【题解】【BST】【Leetcode】Unique Binary Search Trees
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
int numUniTrees(int n, vector<int> &res){
if(res[n] != -)
return res[n]; if(n == ||n == ){
res[n] = ;
return res[n];
} int num = ;
for(int i = ; i < n; i++){
//num += numTrees(i)*numTrees(n-i-1);//剥离出来一个函数之后,注意更改函数名
num += numUniTrees(i, res) * numUniTrees(n-i-, res);
}
res[n] = num;
return res[n];
}
int numTrees(int n) {
if(n < )
return ;
vector<int>res(n+, -);
return numUniTrees(n, res);
}
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