23、二叉搜索树的后序遍历序列 好题,值得再看一遍

输入一个整数数组,判断该数组是不是某二叉搜索树的后序遍历的结果。如果是则返回true,否则返回false。假设输入的数组的任意两个数字都互不相同。
示例1
输入

[4,8,6,12,16,14,10]

返回值

true
1、递归写法,树主要的做法就是递归
bool VerifySquenceOfBST(vector<int> sequence) {
    if (sequence.empty())  return false;
    if (sequence.size() == 1) return true;
    return VerifySquenceOfBSTCore(sequence, 0, sequence.size()-1);
}

bool VerifySquenceOfBSTCore(vector<int>& sequence, int start, int end) {
    if (start >= end) return true;
    int low = start;
    while (low < end && sequence[low] < sequence[end])  ++low;

    for (int i = low; i < end; ++i) {
        if (sequence[i] <= sequence[end]) return false;
    }

    return  VerifySquenceOfBSTCore(sequence, start,low-1) &&
        Verify