forked from p59qpvlxt/tongxun
parent
79c36080fc
commit
3003106943
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<ConformanceMode>true</ConformanceMode>
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<Link>
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<ClCompile Include="源.cpp" />
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<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
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<Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
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<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
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<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
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<Project>
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<ProjectOutputs>
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<ProjectOutput>
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<FullPath>D:\vs代码\2023-10-23\x64\Debug\2023-10-23.exe</FullPath>
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</ProjectOutput>
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</ProjectOutputs>
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<ContentFiles />
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<SatelliteDlls />
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<NonRecipeFileRefs />
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PlatformToolSet=v143:VCToolArchitecture=Native64Bit:VCToolsVersion=14.37.32822:TargetPlatformVersion=10.0.22621.0:
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Debug|x64|D:\vs代码\2023-10-23\|
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D:\vs代码\2023-10-23\源.cpp;D:\vs代码\2023-10-23\x64\Debug\源.obj
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D:\vs代码\2023-10-23\x64\Debug\2023-10-23.exe
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#include <iostream>
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#include <vector>
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#include <string>
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#include <queue>
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#include <unordered_map>
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#include <cmath>
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using namespace std;
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struct TreeNode {
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int val;
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struct TreeNode *left;
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struct TreeNode *right;
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TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
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};
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class IsBalanced_Solution_Node {
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public:
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IsBalanced_Solution_Node(int min=INT_MAX,int max=INT_MIN,int high = 0,bool is_balance=true)
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:_min(min),_max(max),_high(high),_is_balance(is_balance)
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{}
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int _min;
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int _max;
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int _high;
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bool _is_balance;
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};
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IsBalanced_Solution_Node my_IsBalanced_Solution(TreeNode* root) {
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//对于nullptr我们要不要呢
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if (root == nullptr) {
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return IsBalanced_Solution_Node();
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}
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IsBalanced_Solution_Node left = my_IsBalanced_Solution(root->left);
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IsBalanced_Solution_Node right = my_IsBalanced_Solution(root->right);
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int min = root->val;
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int max = root->val;
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int high = 1;
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bool is_balance = true;
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if (left._is_balance == false || right._is_balance == false
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|| std::abs(left._high - right._high) > 1) {
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is_balance = false;
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}
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if (left._high != 0) {
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min = left._min < min ? left._min : ( min);
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}
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if (right._high != 0) {
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max = right._max > max ? right._max : (max);
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}
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high = std::max(left._high, right._high) + 1;
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return IsBalanced_Solution_Node(min, max, high, is_balance);
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}
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// 判断是不是平衡二叉树
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bool IsBalanced_Solution(TreeNode* pRoot) {
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// write code here
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if (pRoot == nullptr) {
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return true;
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}
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return my_IsBalanced_Solution(pRoot)._is_balance;
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}
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class lowestCommonAncestor_Node {
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public:
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lowestCommonAncestor_Node(TreeNode*root = nullptr)
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:node(root){}
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TreeNode* node;
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};
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TreeNode* sum_node = nullptr;
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lowestCommonAncestor_Node my_lowestCommonAncestor(TreeNode* root, int p, int q) {
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if (root == nullptr) {
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return lowestCommonAncestor_Node();
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}
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lowestCommonAncestor_Node left = my_lowestCommonAncestor(root->left,p,q);
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lowestCommonAncestor_Node right = my_lowestCommonAncestor(root->right, p, q);
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//当前的接点有四种可能，
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//当前的节点是p
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//当前的节点是q
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//当前的节点什么都不是，并且是公共的父节点
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//当前的节点什么也不是
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TreeNode* re = nullptr;
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if (left.node == nullptr && right.node == nullptr) {
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if (root->val == q || root->val == p) {
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return lowestCommonAncestor_Node(root);
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}
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}
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if (left.node != nullptr && right.node != nullptr) {
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sum_node = root;
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return lowestCommonAncestor_Node();
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}
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if (left.node != nullptr) {
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if (root->val == p && left.node->val == q) {
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sum_node = root;
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return lowestCommonAncestor_Node();
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}
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if (root->val == q && left.node->val == p) {
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sum_node = root;
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return lowestCommonAncestor_Node();
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}
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re = left.node;
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}
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if (right.node != nullptr) {
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if (root->val == p && right.node->val == q) {
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sum_node = root;
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return lowestCommonAncestor_Node();
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}
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if (root->val == q && right.node->val == p) {
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sum_node = root;
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return lowestCommonAncestor_Node();
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}
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re = right.node;
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}
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return lowestCommonAncestor_Node(re);
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}
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//二叉搜索树的最近公共祖先
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int aalowestCommonAncestor(TreeNode* root, int p, int q) {
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// write code here
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//给定一颗二叉树，和两个节点，返回最近的那个公共的节点
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//有两种方法可以求出这个答案，一个是直接递归求解出我们所需要的答案，
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// 另一个就是采用并查集进行求解操作
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//当我们先采用递归的方式求出公共的节点，再采用并查集的操作解出答案
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sum_node = nullptr;
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my_lowestCommonAncestor(root, p, q);
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return sum_node->val;
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}
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class Union {
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public:
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void put(int father, int child) {
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if (get_father(father) == -1) {
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father_map[father] = father;
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}
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if (get_father(child) == -1) {
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father_map[child] = child;
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}
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father_map[child] = get_father(father);
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}
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int get_father(int child) {
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if (father_map.count(child) == 0) {
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return -1;
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}
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queue<int>qu;
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int father = child;
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qu.push(father);
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while (father != father_map[father]) {
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father = father_map[father];
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qu.push(father);
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}
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while (!qu.empty()) {
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father_map[qu.front()] = father;
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qu.pop();
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}
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return father;
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}
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unordered_map<int, int>father_map;
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||||||
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};
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int re = -1;
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Union un;
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void my_union_lowestCommonAncestor(TreeNode* root, int p, int q) {
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if (re != -1) {
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|
return;
|
||||||
|
}
|
||||||
|
if (root != nullptr) {
|
||||||
|
//每次只有在递归完左树之后，就进行右树的操作，
|
||||||
|
//右树递归完之后就将左右树和当前节点合并
|
||||||
|
my_union_lowestCommonAncestor(root->left, q, p);
|
||||||
|
if (root->left != nullptr) {
|
||||||
|
un.put(root->val, root->left->val);
|
||||||
|
}
|
||||||
|
if (root->val == q && un.get_father(p) != -1) {
|
||||||
|
re = un.get_father(p);
|
||||||
|
}
|
||||||
|
if(root->val == p && un.get_father(q) != -1) {
|
||||||
|
re = un.get_father(q);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
my_union_lowestCommonAncestor(root->right, q, p);
|
||||||
|
if (root->right != nullptr) {
|
||||||
|
un.put(root->val, root->right->val);
|
||||||
|
}
|
||||||
|
if (root->val == q && un.get_father(p) != -1) {
|
||||||
|
re = un.get_father(p);
|
||||||
|
}
|
||||||
|
if(root->val == p && un.get_father(q) != -1) {
|
||||||
|
re = un.get_father(q);
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
|
//采用并查集的方式进行操作
|
||||||
|
//二叉搜索树的最近公共祖先
|
||||||
|
int lowestCommonAncestor(TreeNode* root, int o1, int o2) {
|
||||||
|
// write code here
|
||||||
|
my_union_lowestCommonAncestor(root, o1, o2);
|
||||||
|
return re;
|
||||||
|
}
|
||||||
|
|
||||||
|
void my_Serialize(TreeNode* root, string& str) {
|
||||||
|
if (root == nullptr) {
|
||||||
|
str.append("#");
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
str.append('{'+ to_string(root->val) + '}');
|
||||||
|
my_Serialize(root->left, str);
|
||||||
|
my_Serialize(root->right, str);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
//序列化二叉树
|
||||||
|
char* Serialize(TreeNode* root) {
|
||||||
|
string str;
|
||||||
|
my_Serialize(root, str);
|
||||||
|
|
||||||
|
return const_cast<char*>(str.c_str());
|
||||||
|
}
|
||||||
|
|
||||||
|
TreeNode* my_Deserialize( string& str, int& index) {
|
||||||
|
if (str[index] == '#') {
|
||||||
|
index++;
|
||||||
|
return nullptr;
|
||||||
|
}
|
||||||
|
index = str.find('{', index);
|
||||||
|
index = index + 1;
|
||||||
|
int next_index = str.find('}', index);
|
||||||
|
|
||||||
|
TreeNode* cur = new TreeNode(atoi(str.substr(index, next_index).c_str()));
|
||||||
|
index = next_index + 1;
|
||||||
|
cur->left = my_Deserialize(str, index);
|
||||||
|
cur->right = my_Deserialize(str, index);
|
||||||
|
}
|
||||||
|
|
||||||
|
//反序列化二叉树
|
||||||
|
TreeNode* Deserialize(char* str) {
|
||||||
|
int index = 0;
|
||||||
|
string ss(str);
|
||||||
|
return my_Deserialize( ss,index);
|
||||||
|
}
|
||||||
|
|
||||||
|
int main() {
|
||||||
|
TreeNode* root = new TreeNode(1);
|
||||||
|
root->left = new TreeNode(2);
|
||||||
|
root->right = new TreeNode(3);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
Loading…
Reference in new issue