fix build error

Author: HONGJICAI

buildcpp.py

@@ -2,6 +2,7 @@
 import os
 
 cpps = glob.glob("cpp/*.cpp")
+errors = []
 for cpp in cpps:
     print(cpp)
     code = '''
@@ -11,12 +12,15 @@
     int val;
     TreeNode *left;
     TreeNode *right;
-    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+    TreeNode() : val(0), left(nullptr), right(nullptr) {}
+    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 };
 struct ListNode {
     int val;
     ListNode *next;
     ListNode(int x) : val(x), next(NULL) {}
+    ListNode(int x, ListNode *next) : val(x), next(next) {}
 };
 struct RandomListNode {
     int label;
@@ -44,23 +48,17 @@ class Employee {
     // the id of direct subordinates
     vector<int> subordinates;
 };
-class Node {
-public:
-    int val;
-    vector<Node*> children;
-
-    Node() {}
-
-    Node(int _val, vector<Node*> _children) {
-        val = _val;
-        children = _children;
-    }
-};
 '''
     with open(cpp) as f:
         code += f.read()
     with open("a.cpp", "w") as f:
         f.writelines(code)
-    cmd = "g++ a.cpp -o a.so -shared -fpic -std=c++17"
+    cmd = "g++ a.cpp -o a.so -shared -fpic -std=c++20"
     if 0 != os.system(cmd):
-        exit(-1)
+        errors.append(cpp)
+if len(errors) > 0:
+    print("Errors in the following files:")
+    for error in errors:
+        print(error)
+    exit(1)
+print("All files compiled successfully.")

cpp/111.cpp

@@ -21,7 +21,7 @@ class Solution {
  *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
  * };
  */
-class Solution {
+class Solution2 {
   int min = INT_MAX;
 
 public:

cpp/125.cpp

@@ -28,7 +28,7 @@ class Solution {
         return 0;
     }
 };
-class Solution {
+class Solution2 {
   public:
     bool isPalindrome(string s) {
         string filtered;

cpp/131.cpp

@@ -30,7 +30,7 @@ class Solution {
     }
 };
 // dfs.cpp
-class Solution {
+class Solution2 {
     void dfs(int index, string& s, vector<string>& path,
              vector<vector<string>>& ret) {
         if (index == s.size()) {

cpp/133.cpp

@@ -1,5 +1,3 @@
-/*
-// Definition for a Node.
 class Node {
 public:
     int val;
@@ -17,7 +15,6 @@ class Node {
         neighbors = _neighbors;
     }
 };
-*/
 
 class Solution {
   public:

cpp/138.cpp

@@ -1,5 +1,3 @@
-/*
-// Definition for a Node.
 class Node {
 public:
     int val;
@@ -8,11 +6,10 @@ class Node {
 
     Node(int _val) {
         val = _val;
-        next = NULL;
-        random = NULL;
+        next = nullptr;
+        random = nullptr;
     }
 };
-*/
 // noExtraSpace.cpp
 class Solution {
   public:
@@ -36,7 +33,7 @@ class Solution {
     }
 };
 // scanTWice-60ms.cpp
-class Solution {
+class Solution2 {
   public:
     RandomListNode* copyRandomList(RandomListNode* head) {
         unordered_map<RandomListNode*, int> hash;

cpp/139.cpp

@@ -19,7 +19,7 @@ class Solution {
     }
 };
 // trie+dp.cpp 3ms
-class Solution {
+class Solution2 {
     struct trie {
         trie() : isWord(false) {}
         bool isWord;

cpp/144.cpp

@@ -9,7 +9,7 @@
  *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
  * };
  */
-class Solution {
+class Solution2 {
   public:
     vector<int> preorderTraversal(TreeNode* root) {
         auto h = TreeNode(0, nullptr, root);

cpp/146.cpp

@@ -41,15 +41,15 @@ class LRUCache {
  * obj.put(key,value);
  */
 // map_hashmap_103ms.cpp
-class LRUCache {
+class LRUCache2 {
   unsigned int capacity;
   map<int, int> timemap; // key time,value cache's key
   unordered_map<int, pair<int, int>>
       hashmap; // key cache's key,value cache's value and time
   unsigned int call;
 
 public:
-  LRUCache(int capacity) {
+  LRUCache2(int capacity) {
     this->capacity = capacity;
     call = 0;
   }

cpp/148.cpp

@@ -49,7 +49,7 @@ class Solution {
  *     ListNode(int x) : val(x), next(NULL) {}
  * };
  */
-class Solution {
+class Solution2 {
   pair<ListNode *, ListNode *> helper(ListNode *head) {
     if (!head)
       return {nullptr, nullptr};