我需要使用向量中可用的元素数量来计算可能组合的数量。例如,如果我有一个[0] = 1& [1] = 1并且layer = 2(树的长度),那么我应该得到01的答案。如果[0] = 2& [1] = 2并且layer = 2,则答案是00,01或10,11。问题在于矢量中可能存在不同数量的元素,它们的数量也可能不同。我写了一个递归函数,它创建新节点并将它们引用到向量中,每个节点都有这样的向量,但问题是我不知道如何编写PRINT / SHOW有点函数,以显示结果我需要的方式。请提供一些建议或推荐阅读哪些主题。我非常感谢代码建议。
void addNode(vector<int>currentAmount, int layer, int positionNumber, Node *&myTree)
{
if (myTree==NULL)
{
myTree = new Node;
myTree->listOfNodes.push_back(new Node);
myTree->currentAmount=currentAmount;
}
if (myTree!=NULL&&layer!=0)
{
myTree = new Node;
myTree->positionNumber=positionNumber;
myTree->layer=layer;
currentAmount[positionNumber]-=1;
for (int i=0; i<currentAmount.size();i++)
{
if (currentAmount[i]!=0) {myTree->listOfNodes.push_back(new Node); myTree->positionNumber.push_back(i);}
}
for (int i=0; i<myTree->listOfNodes.size(); i++)
{addNode(currentAmount, layer-1, myTree->positionNumber[i], myTree->listOfNodes[i]);}
}
}
void showTree(Node *&Tree)
{
for (int i=0; i<Tree->listOfNodes.size(); i++)
{
showTree(Tree->listOfNodes[i]);
cout<<Tree->listOfNodes[i]<<' '<<Tree->positionNumber[i]<<<' '<<Tree->layer<<'\t';
}
}
答案 0 :(得分:-1)
我将此代码用于B-TREE。
/*
* C++ Program to Implement B-Tree
*/
#include <iostream>
using namespace std;
// A BTree node
class BTreeNode
{
private:
int *keys;
int t;
BTreeNode **C;
int n;
bool leaf;
public:
BTreeNode(int t1, bool leaf1)
{
t = t1;
leaf = leaf1;
keys = new int[2*t-1];
C = new BTreeNode *[2*t];
n = 0;
}
// traverse all nodes in a subtree rooted with this node
void traverse()
{
int i;
for (i = 0; i < n; i++)
{
if (leaf == false)
C[i]->traverse();
cout << " " << keys[i];
}
if (leaf == false)
C[i]->traverse();
}
void insertNonFull(int k)
{
int i = n-1;
if (leaf == true)
{
while (i >= 0 && keys[i] > k)
{
keys[i+1] = keys[i];
i--;
}
keys[i+1] = k;
n = n+1;
}
else
{
while (i >= 0 && keys[i] > k)
i--;
if (C[i+1]->n == 2*t-1)
{
splitChild(i+1, C[i+1]);
if (keys[i+1] < k)
i++;
}
C[i+1]->insertNonFull(k);
}
}
void splitChild(int i, BTreeNode *y)
{
BTreeNode *z = new BTreeNode(y->t, y->leaf);
z->n = t - 1;
for (int j = 0; j < t-1; j++)
z->keys[j] = y->keys[j+t];
if (y->leaf == false)
{
for (int j = 0; j < t; j++)
z->C[j] = y->C[j+t];
}
y->n = t - 1;
for (int j = n; j >= i+1; j--)
C[j+1] = C[j];
C[i+1] = z;
for (int j = n-1; j >= i; j--)
keys[j+1] = keys[j];
keys[i] = y->keys[t-1];
n = n + 1;
}
BTreeNode *search(int k)
{
int i = 0;
while (i < n && k > keys[i])
i++;
if (keys[i] == k)
return this;
if (leaf == true)
return NULL;
return C[i]->search(k);
}
friend class BTree;
};
// Class BTree
class BTree
{
private:
BTreeNode *root;
int t;
public:
BTree(int _t)
{
root = NULL;
t = _t;
}
void traverse()
{
if (root != NULL)
root->traverse();
}
BTreeNode* search(int k)
{
return (root == NULL)? NULL : root->search(k);
}
void insert(int k)
{
if (root == NULL)
{
root = new BTreeNode(t, true);
root->keys[0] = k;
root->n = 1;
}
else
{
if (root->n == 2*t-1)
{
BTreeNode *s = new BTreeNode(t, false);
s->C[0] = root;
s->splitChild(0, root);
int i = 0;
if (s->keys[0] < k)
i++;
s->C[i]->insertNonFull(k);
root = s;
}
else
root->insertNonFull(k);
}
}
};
// Main
int main()
{
BTree t(3);
t.insert(10);
t.insert(20);
t.insert(5);
t.insert(6);
t.insert(12);
t.insert(30);
t.insert(7);
t.insert(17);
cout << "Traversal of the constucted tree is ";
t.traverse();
cout<<endl;
int k = 6;
cout<<k<<" is ";
(t.search(k) != NULL)? cout << "Present\n" : cout << "Not Present\n";
k = 15;
cout<<k<<" is ";
(t.search(k) != NULL)? cout << "Present\n" : cout << "Not Present\n";
return 0;
}