(十六)剑指offer之二叉搜索树的后序遍历序列
题目描述:
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。
如果是则输出Yes,否则输出No。假设输入的数组的任意两个数字都互不相同。
class Solution {
public:
bool VerifySquenceOfBST(vector<int> sequence) {
int length = sequence.size();
return verifySequence(sequence, length);
}
bool verifySequence(vector<int> sequence, int length){
if(sequence.empty() || length <= 0) return false;
vector<int> rightSequence;
int root = sequence[length-1];
int i = 0;
for(; i<length-1;i++){
if(sequence[i]>root)
break;
}
int j = i;
for(; j<length-1;j++){
if(sequence[j] < root)
return false;
rightSequence.push_back(sequence[j]);
}
bool left = true;
if(i>0)
left = verifySequence(sequence, i);
bool right = true;
if(i<length-1)
right = verifySequence(rightSequence, length-i-1);
return (left && right);
}
};
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