我写了C++代码：

#include <iostream>
#include <queue>
#include <stack>
#include <vector>
#include <unordered_map>
#include <algorithm>
using namespace std;
template <class T>
class TreeNode {
public:
    T data;
    TreeNode<T> *left, *right;
    TreeNode() {
        data = {};
        left = right = NULL;
    }
    TreeNode(T data) {
        this->data = data;
    }
};
template <class T>
class BinaryTree {
public:
    TreeNode<T> *root;
    vector<T> _largestIndependentSet(TreeNode<T> *root) {
        static unordered_map< TreeNode<T>*, vector<T> > table;
        if(!root)
            return {};
        if(table.find(root) != table.end()) 
            return table[root];
        vector<T> lis = {}, lis_left = {}, lis_right = {},
            lis_nrl_left = {}, lis_nrl_right = {}, lis_nrr_left = {}, lis_nrr_right = {};
        // Leaf
        if(!root->left && !root->right) {
            lis.push_back(root->data);
        }else{
            if(root->left){
                lis_left = _largestIndependentSet(root->left);
                lis_nrl_left = _largestIndependentSet(root->left->left);
                lis_nrl_right = _largestIndependentSet(root->left->right);
            }
            if(root->right){
                lis_right = _largestIndependentSet(root->right);
                lis_nrr_left = _largestIndependentSet(root->right->left);
                lis_nrr_right = _largestIndependentSet(root->right->right);
            }
            if(     lis_left.size() + lis_right.size() > 
                    lis_nrl_left.size() + lis_nrl_right.size() +
                    lis_nrr_left.size() + lis_nrr_right.size() + 1      ){ // don't keep root
                lis.insert(lis.end(), lis_left.begin(), lis_left.end());
                lis.insert(lis.end(), lis_right.begin(), lis_right.end());
            }
            else {
                lis.insert(lis.end(), lis_nrl_left.begin(), lis_nrl_left.end());
                lis.insert(lis.end(), lis_nrl_right.begin(), lis_nrl_right.end());
                lis.insert(lis.end(), lis_nrr_left.begin(), lis_nrr_left.end());
                lis.insert(lis.end(), lis_nrr_right.begin(), lis_nrr_right.end());
                lis.push_back(root->data);
            }
        }
        cout<<"Calculated Results for: "<<root->data<<": ";
        for_each(lis.begin(), lis.end(), [](T data) {
            cout<<data<<" ";
        });
        cout<<"\n";
        table[root] = lis;
        return table[root];
    }
    void largestIndependentSet() {
        vector<T> lis = _largestIndependentSet(this->root);
        for_each(lis.begin(), lis.end(), [](T data) {
            cout<<data<<" ";
        });
    }
};
int main() {
    BinaryTree<int> bt;
    TreeNode<int> *root = new TreeNode<int>(10);
    root->left =  new TreeNode<int>(7);
    root->right =  new TreeNode<int>(15);
    root->left->left =  new TreeNode<int>(9);
    root->left->right =  new TreeNode<int>(12);
    root->right->left =  new TreeNode<int>(6);
    root->right->right =  new TreeNode<int>(11);
    root->left->left->left = new TreeNode<int>(20);
    root->right->left->right = new TreeNode<int>(5);
    root->left->left->left->left = new TreeNode<int>(22);
    root->left->left->left->right = new TreeNode<int>(21);
    root->right->left->right->left = new TreeNode<int>(4);
    root->right->left->right->right = new TreeNode<int>(3);
    bt.root = root;
    bt.largestIndependentSet();
    return 0;
}

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我在Cygwin上使用g++ 5.4.0编译了它：

g++ binary_tree.cpp -std=c++11

型
问题是，在递归函数_largestIndependentSet()完成后，最后一次打印给了我正确的答案。但在那之后，我得到了这个错误：Aborted（core dumped），并且largestIndependentSet()中的打印没有执行。
这是令人费解的，因为我的逻辑似乎是正确的，这是什么原因造成的呢？
PS：如果我编译它与c++14标志它运行罚款o_O：

g++ binary_tree.cpp -std=c++14

型