MYSQL執行SQL語句異常:The last packet successfully received from the server was 100,107 milliseconds ago. The last packet sent successfully to the server was 100,101 milliseconds ago.
這個錯誤表明 MySQL 服務器與 JDBC 連接之間的通信超時了。通常由…
Initializer Lists
對于一個類P
class P{P(int a, int b){cout << "P(int, int), a" << a << ", b " << b << endl;}P(initializer_list<int> initlist){cout << "P(initializer_list<int>), val…
不難,有兩種解法(看答案才想到中序遍歷)。
我用的是普通遞歸,和上一題差不多,規定min和max,每次遍歷縮小范圍:
/*** Definition for a binary tree node.* struct TreeNode {* int val;* TreeNod…