MYSQL执行SQL语句异常: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.
这个错误表明 MySQL 服务器与 JDBC 连接之间的通信超时了。通常由…
Initializer Lists
对于一个类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…
不难,有两种解法(看答案才想到中序遍历)。
我用的是普通递归,和上一题差不多,规定min和max,每次遍历缩小范围:
/*** Definition for a binary tree node.* struct TreeNode {* int val;* TreeNod…