如何获取列表中有子节点的树的节点总和?

How to get sum of nodes of a tree which has children in a list?

所以我有一棵树是这样的:

class Tree{
public:
int data1;
string data2;
Animal animal;
std::list<Tree> children;
};

我正在尝试计算奇数级别的 data1 个节点的总和,但我无法这样做。我这样计算所有节点的总和:

int addData1(const Tree* t, int sum){
    if(t == nullptr) {
        return sum;
    }
    else{
        int temp = 0;
        std::list<Tree> forest = t->children;
        std::list<Tree>::iterator it;

        for(it = forest.begin(); it != forest.end(); ++it){
            Tree curr = *it;
            temp += addData1(&curr, sum);
        }

        return t->data1 + temp;
    }
}

但是对于奇数级别我无法这样做,我这样尝试过,但是我得到的总和不正确:

int addData1Odd(const Tree* t, bool odd, int sum){
    if(t == nullptr){
        return sum;
    }
    else{
        int temp = 0;
        std::list<Tree> forest = t->children;
        std::list<Tree>::iterator it;

        for(it = forest.begin(); it != forest.end(); ++it){
            Tree curr = *it;
            if(odd)
                temp += addData1Odd(&curr, !odd, sum);
        }

        return t->data1 + temp;
    }
}

如有任何帮助,我将不胜感激。

如果你不在奇数层,你就停止递归。您仍然应该递归,但不要将其添加到您的总和

编辑: 试试这个:

    for(it = forest.begin(); it != forest.end(); ++it){
        Tree curr = *it;
        temp += addData1Odd(&curr, !odd, sum);
    }

    if (odd)
       return t->data1 + temp;
    else
       return temp;