Stack

Exercise/TreeToGraph.cpp

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+/*
+ * @Author: e2hang 2099307493@qq.com
+ * @Date: 2025-12-10 15:56:43
+ * @LastEditors: e2hang 2099307493@qq.com
+ * @LastEditTime: 2025-12-10 16:50:18
+ * @FilePath: \undefinedd:\code\Git-DataStructureAlgorithms\Exercise\TreeToGraph.cpp
+ * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
+ */
+#include <iostream>
+#include <vector>
+#include <unordered_map>
+#include <deque>
+using namespace std;
+
+struct TreeNode{
+    int val;
+    TreeNode* left;
+    TreeNode* right;
+};
+
+//我直接写TreeNode -> Graph的内容了
+unordered_map<TreeNode*, vector<TreeNode*>> adj;
+unordered_map<TreeNode*, bool> visited;
+
+void TreeNodeToGraph(TreeNode* root){
+    if(root == nullptr) return;
+    if(root->left != nullptr){
+        adj[root].push_back(root->left);
+        adj[root->left].push_back(root);
+        TreeNodeToGraph(root->left);
+    }
+    if(root->right != nullptr){
+        adj[root].push_back(root->right);
+        adj[root->right].push_back(root);
+        TreeNodeToGraph(root->right);
+    }
+}
+//target 是 起始点
+deque<TreeNode*> BFS(TreeNode* target, int step){
+    deque<TreeNode*> q;
+    q.push_back(target);
+    int dist = 0;
+
+    while(!q.empty()){
+        int cnt = q.size();//每次弹几个
+        if(dist == step) return q;
+
+        for(int i = 0; i < cnt; i++){
+            auto node = q.front();
+            q.pop_front();
+            visited[node] = true;
+            for(auto x : adj[node]){
+                if(!visited[x]) {
+                    q.push_back(x);
+                    visited[x] = true;
+                }
+            }
+        }
+        dist++;
+    }
+    return {};
+}
+
+
+int main(){
+
+    
+    return 0;
+}