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swoole-websocket-test
玩一下swoole的websocket
WebSocket是HTML5开始提供的一种在单个TCP连接上进行全双工通讯的协议。WebSocket通信协议于2011年被IETF定为标准RFC 6455,WebSocketAPI被W3C定为标准。
,在web私信,im等应用较多。背景和优缺点可以参看wiki。
环境准备
因为swoole官方还不支持windows,所以需要装下linux,之前都是用ubuntu,
这次就试一下centos7,还是满好看的,虽然虚拟机会默认最小安装,需要在安装
时自己选择带gnome的,当然最小安装也是可以的,只是最后需要改下防火墙。
然后是装下PHP,Nginx什么的,我是用Oneinstack,可以按需安装
给做这个的大大点个赞。
invert-binary-tree
Invert a binary tree
4
/ \
2 7
/ \ / \
1 3 6 9
to
4
/ \
7 2
/ \ / \
9 6 3 1
Trivia:
This problem was inspired by this original tweet by Max Howell:
Google: 90% of our engineers use the software you wrote (Homebrew),
but you can’t invert a binary tree on a whiteboard so fuck off.
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
public:
TreeNode* invertTree(TreeNode* root) {
if(root == NULL) return root;
TreeNode* temp;
temp = invertTree(root->left);
root->left = invertTree(root->right);
root->right = temp;
return root;
}
};leetcode no.3
**Longest Substring Without Repeating Characters **
add-two-number
problem
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
Input:(2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
分析(不用英文装逼了)
这个代码是抄来的,链接原作是这位大大。